Core/Misc: Refactor scripts to fix static analysis warnings

Fifth batch of fixes targeting 100 issues reported by Coverity

45 files changed, 945 insertions, 394 deletions

diff --git a/src/server/scripts/Northrend/Naxxramas/boss_maexxna.cpp b/src/server/scripts/Northrend/Naxxramas/boss_maexxna.cpp
index 5b02b7a2009..209e689e615 100644
--- a/src/server/scripts/Northrend/Naxxramas/boss_maexxna.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/boss_maexxna.cpp
@@ -66,14 +66,22 @@ public:
 
     struct boss_maexxnaAI : public BossAI
     {
-        boss_maexxnaAI(Creature* creature) : BossAI(creature, BOSS_MAEXXNA) { }
+        boss_maexxnaAI(Creature* creature) : BossAI(creature, BOSS_MAEXXNA)
+        {
+            Initialize();
+        }
+
+        void Initialize()
+        {
+            enraged = false;
+        }
 
         bool enraged;
 
         void EnterCombat(Unit* /*who*/) override
         {
             _EnterCombat();
-            enraged = false;
+            Initialize();
             events.ScheduleEvent(EVENT_WRAP, 20000);
             events.ScheduleEvent(EVENT_SPRAY, 40000);
             events.ScheduleEvent(EVENT_SHOCK, urand(5000, 10000));
diff --git a/src/server/scripts/Northrend/Naxxramas/boss_noth.cpp b/src/server/scripts/Northrend/Naxxramas/boss_noth.cpp
index 94117e9dbbf..0e07ff027f6 100644
--- a/src/server/scripts/Northrend/Naxxramas/boss_noth.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/boss_noth.cpp
@@ -72,7 +72,11 @@ public:
 
     struct boss_nothAI : public BossAI
     {
-        boss_nothAI(Creature* creature) : BossAI(creature, BOSS_NOTH) { }
+        boss_nothAI(Creature* creature) : BossAI(creature, BOSS_NOTH)
+        {
+            balconyCount = 0;
+            waveCount = 0;
+        }
 
         void Reset() override
         {
diff --git a/src/server/scripts/Northrend/Naxxramas/boss_patchwerk.cpp b/src/server/scripts/Northrend/Naxxramas/boss_patchwerk.cpp
index 3e8a54f7cec..116cee5f275 100644
--- a/src/server/scripts/Northrend/Naxxramas/boss_patchwerk.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/boss_patchwerk.cpp
@@ -61,7 +61,10 @@ public:
 
     struct boss_patchwerkAI : public BossAI
     {
-        boss_patchwerkAI(Creature* creature) : BossAI(creature, BOSS_PATCHWERK) { }
+        boss_patchwerkAI(Creature* creature) : BossAI(creature, BOSS_PATCHWERK)
+        {
+            Enraged = false;
+        }
 
         bool Enraged;
 
diff --git a/src/server/scripts/Northrend/Naxxramas/boss_sapphiron.cpp b/src/server/scripts/Northrend/Naxxramas/boss_sapphiron.cpp
index 0f5320a8fa1..ce5010c972f 100644
--- a/src/server/scripts/Northrend/Naxxramas/boss_sapphiron.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/boss_sapphiron.cpp
@@ -90,9 +90,19 @@ class boss_sapphiron : public CreatureScript
         struct boss_sapphironAI : public BossAI
         {
             boss_sapphironAI(Creature* creature) :
-                BossAI(creature, BOSS_SAPPHIRON), _phase(PHASE_NULL),
-                _map(me->GetMap())
-            { }
+                BossAI(creature, BOSS_SAPPHIRON), _map(me->GetMap())
+            {
+                Initialize();
+                _iceboltCount = 0;
+            }
+
+            void Initialize()
+            {
+                _phase = PHASE_NULL;
+
+                _canTheHundredClub = true;
+                _checkFrostResistTimer = 5 * IN_MILLISECONDS;
+            }
 
             void InitializeAI() override
             {
@@ -115,10 +125,7 @@ class boss_sapphiron : public CreatureScript
                 if (_phase == PHASE_FLIGHT)
                     ClearIceBlock();
 
-                _phase = PHASE_NULL;
-
-                _canTheHundredClub = true;
-                _checkFrostResistTimer = 5 * IN_MILLISECONDS;
+                Initialize();
             }
 
             void EnterCombat(Unit* /*who*/) override
diff --git a/src/server/scripts/Northrend/Naxxramas/boss_thaddius.cpp b/src/server/scripts/Northrend/Naxxramas/boss_thaddius.cpp
index 0dfae16323b..8ae3b5790db 100644
--- a/src/server/scripts/Northrend/Naxxramas/boss_thaddius.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/boss_thaddius.cpp
@@ -137,6 +137,9 @@ public:
                 me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_IMMUNE_TO_PC | UNIT_FLAG_NOT_SELECTABLE | UNIT_FLAG_STUNNED);
                 me->SetReactState(REACT_PASSIVE);
             }
+
+            polaritySwitch = false;
+            uiAddsTimer = 0;
         }
 
         bool checkStalaggAlive;
@@ -287,9 +290,16 @@ public:
     {
         npc_stalaggAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            powerSurgeTimer = urand(20000, 25000);
+            magneticPullTimer = 20000;
+        }
+
         InstanceScript* instance;
 
         uint32 powerSurgeTimer;
@@ -300,8 +310,7 @@ public:
             if (Creature* pThaddius = ObjectAccessor::GetCreature(*me, instance->GetData64(DATA_THADDIUS)))
                 if (pThaddius->AI())
                     pThaddius->AI()->DoAction(ACTION_STALAGG_RESET);
-            powerSurgeTimer = urand(20000, 25000);
-            magneticPullTimer = 20000;
+            Initialize();
         }
 
         void KilledUnit(Unit* /*victim*/) override
@@ -379,9 +388,15 @@ public:
     {
         npc_feugenAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            staticFieldTimer = 5000;
+        }
+
         InstanceScript* instance;
 
         uint32 staticFieldTimer;
@@ -391,7 +406,7 @@ public:
             if (Creature* pThaddius = ObjectAccessor::GetCreature(*me, instance->GetData64(DATA_THADDIUS)))
                 if (pThaddius->AI())
                     pThaddius->AI()->DoAction(ACTION_FEUGEN_RESET);
-            staticFieldTimer = 5000;
+            Initialize();
         }
 
         void KilledUnit(Unit* /*victim*/) override
diff --git a/src/server/scripts/Northrend/Naxxramas/instance_naxxramas.cpp b/src/server/scripts/Northrend/Naxxramas/instance_naxxramas.cpp
index 173b6e2d094..2fc49be0903 100644
--- a/src/server/scripts/Northrend/Naxxramas/instance_naxxramas.cpp
+++ b/src/server/scripts/Northrend/Naxxramas/instance_naxxramas.cpp
@@ -126,6 +126,9 @@ class instance_naxxramas : public InstanceMapScript
                 SapphironGUID           = 0;
                 KelthuzadGUID           = 0;
                 KelthuzadTriggerGUID    = 0;
+                minHorsemenDiedTime     = 0;
+                maxHorsemenDiedTime     = 0;
+                AbominationCount        = 0;
 
                 playerDied              = 0;
 
@@ -447,7 +450,6 @@ class instance_naxxramas : public InstanceMapScript
             uint64 BaronGUID;
             uint64 SirGUID;
             uint64 HorsemenChestGUID;
-            uint64 HorsemenTeleporterGUID;
             time_t minHorsemenDiedTime;
             time_t maxHorsemenDiedTime;
 
diff --git a/src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp b/src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp
index ac6fd29d8a1..9ba0806ffd2 100644
--- a/src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp
+++ b/src/server/scripts/Northrend/Nexus/EyeOfEternity/boss_malygos.cpp
@@ -342,16 +342,13 @@ public:
     {
         boss_malygosAI(Creature* creature) : BossAI(creature, DATA_MALYGOS_EVENT)
         {
+            Initialize();
             _despawned = false; // We determine if Malygos will be realocated to spawning position on reset triggered by boss despawn on evade
             _flySpeed = me->GetSpeed(MOVE_FLIGHT); // Get initial fly speed, otherwise on each wipe fly speed would add up if we get it
         }
 
-        void Reset() override
+        void Initialize()
         {
-            // EnterEvadeMode and Reset() links are cut for the sake of properly functioning despawner.
-            if (!_despawned)
-                _Reset();
-
             _summonDeaths = 0;
             _preparingPulsesChecker = 0;
             _arcaneOverloadGUID = 0;
@@ -366,6 +363,15 @@ public:
             _firstCyclicMovementStarted = false;
             _performingSurgeOfPower = false;
             _performingDestroyPlatform = false;
+        }
+
+        void Reset() override
+        {
+            // EnterEvadeMode and Reset() links are cut for the sake of properly functioning despawner.
+            if (!_despawned)
+                _Reset();
+
+            Initialize();
 
             me->SetDisableGravity(true);
             me->SetByteFlag(UNIT_FIELD_BYTES_1, 3, UNIT_BYTE1_FLAG_ALWAYS_STAND | UNIT_BYTE1_FLAG_HOVER);
@@ -1173,17 +1179,23 @@ public:
     {
         npc_melee_hover_diskAI(Creature* creature) : VehicleAI(creature)
         {
+            Initialize();
             _instance = creature->GetInstanceScript();
             me->SetReactState(REACT_PASSIVE);
             // TO DO: These were a bit faster than what they should be. Not sure what is the reason.
             me->SetSpeed(MOVE_FLIGHT, 1.25f);
         }
 
+        void Initialize()
+        {
+            _wpCount = 0;
+        }
+
         void Reset() override
         {
             VehicleAI::Reset();
 
-            _wpCount = 0;
+            Initialize();
         }
 
         void PassengerBoarded(Unit* unit, int8 /*seat*/, bool apply) override
@@ -1507,10 +1519,7 @@ public:
         void IsSummonedBy(Unit* summoner) override
         {
             if (Creature* creature = summoner->ToCreature())
-            {
-                _malygos = creature;
-                _malygos->AI()->SetGUID(me->GetGUID(), DATA_LAST_OVERLOAD_GUID);
-            }
+                creature->AI()->SetGUID(me->GetGUID(), DATA_LAST_OVERLOAD_GUID);
         }
 
         void UpdateAI(uint32 /*diff*/)
@@ -1539,7 +1548,6 @@ public:
         }
 
     private:
-        Creature* _malygos;
         InstanceScript* _instance;
     };
 
@@ -1559,6 +1567,7 @@ public:
     {
         npc_wyrmrest_skytalonAI(Creature* creature) : VehicleAI(creature)
         {
+            _summoner = NULL;
         }
 
         void IsSummonedBy(Unit* summoner) override
diff --git a/src/server/scripts/Northrend/Nexus/EyeOfEternity/instance_eye_of_eternity.cpp b/src/server/scripts/Northrend/Nexus/EyeOfEternity/instance_eye_of_eternity.cpp
index 1489b78159b..d8a5cfae60d 100644
--- a/src/server/scripts/Northrend/Nexus/EyeOfEternity/instance_eye_of_eternity.cpp
+++ b/src/server/scripts/Northrend/Nexus/EyeOfEternity/instance_eye_of_eternity.cpp
@@ -47,6 +47,8 @@ public:
             platformGUID = 0;
             exitPortalGUID = 0;
             alexstraszaBunnyGUID = 0;
+            heartOfMagicGUID = 0;
+            giftBoxBunnyGUID = 0;
         };
 
         bool SetBossState(uint32 type, EncounterState state) override
diff --git a/src/server/scripts/Northrend/Nexus/Nexus/boss_anomalus.cpp b/src/server/scripts/Northrend/Nexus/Nexus/boss_anomalus.cpp
index 019a85c1387..399f2eb8ac2 100644
--- a/src/server/scripts/Northrend/Nexus/Nexus/boss_anomalus.cpp
+++ b/src/server/scripts/Northrend/Nexus/Nexus/boss_anomalus.cpp
@@ -77,23 +77,28 @@ class boss_anomalus : public CreatureScript
         {
             boss_anomalusAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = me->GetInstanceScript();
             }
 
+            void Initialize()
+            {
+                Phase = 0;
+                uiSparkTimer = 5000;
+                uiChaoticRiftGUID = 0;
+                chaosTheory = true;
+            }
+
             InstanceScript* instance;
 
             uint8 Phase;
             uint32 uiSparkTimer;
-            uint32 uiCreateRiftTimer;
             uint64 uiChaoticRiftGUID;
             bool chaosTheory;
 
             void Reset() override
             {
-                Phase = 0;
-                uiSparkTimer = 5000;
-                uiChaoticRiftGUID = 0;
-                chaosTheory = true;
+                Initialize();
 
                 instance->SetData(DATA_ANOMALUS_EVENT, NOT_STARTED);
             }
@@ -197,10 +202,17 @@ class npc_chaotic_rift : public CreatureScript
         {
             npc_chaotic_riftAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = me->GetInstanceScript();
                 SetCombatMovement(false);
             }
 
+            void Initialize()
+            {
+                uiChaoticEnergyBurstTimer = 1000;
+                uiSummonCrazedManaWraithTimer = 5000;
+            }
+
             InstanceScript* instance;
 
             uint32 uiChaoticEnergyBurstTimer;
@@ -208,8 +220,7 @@ class npc_chaotic_rift : public CreatureScript
 
             void Reset() override
             {
-                uiChaoticEnergyBurstTimer = 1000;
-                uiSummonCrazedManaWraithTimer = 5000;
+                Initialize();
                 me->SetDisplayId(me->GetCreatureTemplate()->Modelid2);
                 DoCast(me, SPELL_ARCANEFORM, false);
             }
diff --git a/src/server/scripts/Northrend/Nexus/Nexus/boss_keristrasza.cpp b/src/server/scripts/Northrend/Nexus/Nexus/boss_keristrasza.cpp
index bfe34ece6cf..7bc4174260b 100644
--- a/src/server/scripts/Northrend/Nexus/Nexus/boss_keristrasza.cpp
+++ b/src/server/scripts/Northrend/Nexus/Nexus/boss_keristrasza.cpp
@@ -68,9 +68,20 @@ public:
     {
         boss_keristraszaAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiCrystalfireBreathTimer = 14 * IN_MILLISECONDS;
+            uiCrystalChainsCrystalizeTimer = DUNGEON_MODE(30 * IN_MILLISECONDS, 11 * IN_MILLISECONDS);
+            uiTailSweepTimer = 5 * IN_MILLISECONDS;
+            bEnrage = false;
+
+            intenseCold = true;
+        }
+
         InstanceScript* instance;
 
         std::list<uint64> intenseColdList;
@@ -83,12 +94,7 @@ public:
 
         void Reset() override
         {
-            uiCrystalfireBreathTimer = 14*IN_MILLISECONDS;
-            uiCrystalChainsCrystalizeTimer = DUNGEON_MODE(30*IN_MILLISECONDS, 11*IN_MILLISECONDS);
-            uiTailSweepTimer = 5*IN_MILLISECONDS;
-            bEnrage = false;
-
-            intenseCold = true;
+            Initialize();
             intenseColdList.clear();
 
             me->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_STUNNED);
diff --git a/src/server/scripts/Northrend/Nexus/Nexus/boss_magus_telestra.cpp b/src/server/scripts/Northrend/Nexus/Nexus/boss_magus_telestra.cpp
index e42d3d2bcfc..c08fd97a76f 100644
--- a/src/server/scripts/Northrend/Nexus/Nexus/boss_magus_telestra.cpp
+++ b/src/server/scripts/Northrend/Nexus/Nexus/boss_magus_telestra.cpp
@@ -72,7 +72,32 @@ public:
     {
         boss_magus_telestraAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
+            bFireMagusDead = false;
+            bFrostMagusDead = false;
+            bArcaneMagusDead = false;
+            uiIsWaitingToAppearTimer = 0;
+        }
+
+        void Initialize()
+        {
+            Phase = 0;
+            //These times are probably wrong
+            uiIceNovaTimer = 7 * IN_MILLISECONDS;
+            uiFireBombTimer = 0;
+            uiGravityWellTimer = 15 * IN_MILLISECONDS;
+            uiCooldown = 0;
+
+            uiFireMagusGUID = 0;
+            uiFrostMagusGUID = 0;
+            uiArcaneMagusGUID = 0;
+
+            for (uint8 n = 0; n < 3; ++n)
+                time[n] = 0;
+
+            splitPersonality = 0;
+            bIsWaitingToAppear = false;
         }
 
         InstanceScript* instance;
@@ -98,22 +123,7 @@ public:
 
         void Reset() override
         {
-            Phase = 0;
-            //These times are probably wrong
-            uiIceNovaTimer =  7*IN_MILLISECONDS;
-            uiFireBombTimer =  0;
-            uiGravityWellTimer = 15*IN_MILLISECONDS;
-            uiCooldown = 0;
-
-            uiFireMagusGUID = 0;
-            uiFrostMagusGUID = 0;
-            uiArcaneMagusGUID = 0;
-
-            for (uint8 n = 0; n < 3; ++n)
-                time[n] = 0;
-
-            splitPersonality = 0;
-            bIsWaitingToAppear = false;
+            Initialize();
 
             me->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NOT_SELECTABLE);
             me->SetVisible(true);
diff --git a/src/server/scripts/Northrend/Nexus/Nexus/boss_ormorok.cpp b/src/server/scripts/Northrend/Nexus/Nexus/boss_ormorok.cpp
index 222f0474c01..84523c1864d 100644
--- a/src/server/scripts/Northrend/Nexus/Nexus/boss_ormorok.cpp
+++ b/src/server/scripts/Northrend/Nexus/Nexus/boss_ormorok.cpp
@@ -68,12 +68,20 @@ public:
 
     struct boss_ormorokAI : public BossAI
     {
-        boss_ormorokAI(Creature* creature) : BossAI(creature, DATA_ORMOROK_EVENT) { }
+        boss_ormorokAI(Creature* creature) : BossAI(creature, DATA_ORMOROK_EVENT)
+        {
+            Initialize();
+        }
+
+        void Initialize()
+        {
+            frenzy = false;
+        }
 
         void Reset()
         {
             BossAI::Reset();
-            frenzy = false;
+            Initialize();
         }
 
         void EnterCombat(Unit* /*who*/) override
diff --git a/src/server/scripts/Northrend/Nexus/Oculus/boss_drakos.cpp b/src/server/scripts/Northrend/Nexus/Oculus/boss_drakos.cpp
index 3539661ea19..ea23041da6f 100644
--- a/src/server/scripts/Northrend/Nexus/Oculus/boss_drakos.cpp
+++ b/src/server/scripts/Northrend/Nexus/Oculus/boss_drakos.cpp
@@ -57,7 +57,15 @@ class boss_drakos : public CreatureScript
 
         struct boss_drakosAI : public BossAI
         {
-            boss_drakosAI(Creature* creature) : BossAI(creature, DATA_DRAKOS) { }
+            boss_drakosAI(Creature* creature) : BossAI(creature, DATA_DRAKOS)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                postPull = false;
+            }
 
             void Reset() override
             {
@@ -67,7 +75,7 @@ class boss_drakos : public CreatureScript
                 events.ScheduleEvent(EVENT_STOMP, 17000);
                 events.ScheduleEvent(EVENT_BOMB_SUMMON, 2000);
 
-                postPull = false;
+                Initialize();
             }
 
             void EnterCombat(Unit* /*who*/) override
@@ -150,7 +158,15 @@ class npc_unstable_sphere : public CreatureScript
 
         struct npc_unstable_sphereAI : public ScriptedAI
         {
-            npc_unstable_sphereAI(Creature* creature) : ScriptedAI(creature) { }
+            npc_unstable_sphereAI(Creature* creature) : ScriptedAI(creature)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                pulseTimer = 3000;
+            }
 
             void Reset() override
             {
@@ -160,7 +176,7 @@ class npc_unstable_sphere : public CreatureScript
                 me->AddAura(SPELL_UNSTABLE_SPHERE_PASSIVE, me);
                 me->AddAura(SPELL_UNSTABLE_SPHERE_TIMER, me);
 
-                pulseTimer = 3000;
+                Initialize();
 
                 me->DespawnOrUnsummon(19000);
             }
diff --git a/src/server/scripts/Northrend/Nexus/Oculus/boss_eregos.cpp b/src/server/scripts/Northrend/Nexus/Oculus/boss_eregos.cpp
index 3ae61bdd116..0dc05cb450d 100644
--- a/src/server/scripts/Northrend/Nexus/Oculus/boss_eregos.cpp
+++ b/src/server/scripts/Northrend/Nexus/Oculus/boss_eregos.cpp
@@ -85,16 +85,24 @@ class boss_eregos : public CreatureScript
 
         struct boss_eregosAI : public BossAI
         {
-            boss_eregosAI(Creature* creature) : BossAI(creature, DATA_EREGOS) { }
+            boss_eregosAI(Creature* creature) : BossAI(creature, DATA_EREGOS)
+            {
+                Initialize();
+            }
 
-            void Reset() override
+            void Initialize()
             {
-                _Reset();
                 _phase = PHASE_NORMAL;
 
                 _rubyVoid = true;
                 _emeraldVoid = true;
                 _amberVoid = true;
+            }
+
+            void Reset() override
+            {
+                _Reset();
+                Initialize();
 
                 DoAction(ACTION_SET_NORMAL_EVENTS);
             }
diff --git a/src/server/scripts/Northrend/Nexus/Oculus/boss_urom.cpp b/src/server/scripts/Northrend/Nexus/Oculus/boss_urom.cpp
index c4e0986edd4..9dddf721d53 100644
--- a/src/server/scripts/Northrend/Nexus/Oculus/boss_urom.cpp
+++ b/src/server/scripts/Northrend/Nexus/Oculus/boss_urom.cpp
@@ -95,6 +95,7 @@ class boss_urom : public CreatureScript
         {
             boss_uromAI(Creature* creature) : BossAI(creature, DATA_UROM)
             {
+                Initialize();
                 platform = 0;
 
                 for (uint8 i = 0; i < 3; ++i)
@@ -103,19 +104,13 @@ class boss_urom : public CreatureScript
                 std::random_shuffle(group, group + 3);
             }
 
-            void Reset() override
+            void Initialize()
             {
-                me->CastSpell(me, SPELL_EVOCATE);
-
-                _Reset();
-
                 x = 0.0f;
                 y = 0.0f;
                 canCast = false;
                 canGoBack = false;
 
-                me->GetMotionMaster()->MoveIdle();
-
                 teleportTimer = urand(30000, 35000);
                 arcaneExplosionTimer = 9000;
                 castArcaneExplosionTimer = 2000;
@@ -123,6 +118,15 @@ class boss_urom : public CreatureScript
                 timeBombTimer = urand(20000, 25000);
             }
 
+            void Reset() override
+            {
+                me->CastSpell(me, SPELL_EVOCATE);
+
+                _Reset();
+
+                me->GetMotionMaster()->MoveIdle();
+            }
+
             void EnterCombat(Unit* /*who*/) override
             {
                 _EnterCombat();
diff --git a/src/server/scripts/Northrend/Nexus/Oculus/boss_varos.cpp b/src/server/scripts/Northrend/Nexus/Oculus/boss_varos.cpp
index d07d68f28c9..17508517f44 100644
--- a/src/server/scripts/Northrend/Nexus/Oculus/boss_varos.cpp
+++ b/src/server/scripts/Northrend/Nexus/Oculus/boss_varos.cpp
@@ -59,7 +59,16 @@ class boss_varos : public CreatureScript
 
         struct boss_varosAI : public BossAI
         {
-            boss_varosAI(Creature* creature) : BossAI(creature, DATA_VAROS) { }
+            boss_varosAI(Creature* creature) : BossAI(creature, DATA_VAROS)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                firstCoreEnergize = false;
+                coreEnergizeOrientation = 0.0f;
+            }
 
             void InitializeAI() override
             {
@@ -77,8 +86,7 @@ class boss_varos : public CreatureScript
                 // not sure if this is handled by a timer or hp percentage
                 events.ScheduleEvent(EVENT_CALL_AZURE, urand(15, 30) * IN_MILLISECONDS);
 
-                firstCoreEnergize = false;
-                coreEnergizeOrientation = 0.0f;
+                Initialize();
             }
 
             void EnterCombat(Unit* /*who*/) override
@@ -170,12 +178,18 @@ class npc_azure_ring_captain : public CreatureScript
         {
             npc_azure_ring_captainAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = creature->GetInstanceScript();
             }
 
-            void Reset() override
+            void Initialize()
             {
                 targetGUID = 0;
+            }
+
+            void Reset() override
+            {
+                Initialize();
 
                 me->SetWalk(true);
                 //! HACK: Creature's can't have MOVEMENTFLAG_FLYING
diff --git a/src/server/scripts/Northrend/Nexus/Oculus/oculus.cpp b/src/server/scripts/Northrend/Nexus/Oculus/oculus.cpp
index 259d7faa6fe..8a0921b604b 100644
--- a/src/server/scripts/Northrend/Nexus/Oculus/oculus.cpp
+++ b/src/server/scripts/Northrend/Nexus/Oculus/oculus.cpp
@@ -232,13 +232,19 @@ class npc_ruby_emerald_amber_drake : public CreatureScript
         {
             npc_ruby_emerald_amber_drakeAI(Creature* creature) : VehicleAI(creature)
             {
+                Initialize();
                 _instance = creature->GetInstanceScript();
             }
 
+            void Initialize()
+            {
+                _healthWarning = true;
+            }
+
             void Reset() override
             {
                 _events.Reset();
-                _healthWarning = true;
+                Initialize();
             }
 
             void IsSummonedBy(Unit* summoner) override
diff --git a/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_bjarngrim.cpp b/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_bjarngrim.cpp
index 40fa5a5c934..29de693bf3a 100644
--- a/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_bjarngrim.cpp
+++ b/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_bjarngrim.cpp
@@ -106,12 +106,35 @@ public:
     {
         boss_bjarngrimAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
             m_uiStance = STANCE_DEFENSIVE;
             memset(&m_auiStormforgedLieutenantGUID, 0, sizeof(m_auiStormforgedLieutenantGUID));
             canBuff = true;
         }
 
+        void Initialize()
+        {
+            m_bIsChangingStance = false;
+
+            m_uiChargingStatus = 0;
+            m_uiCharge_Timer = 1000;
+
+            m_uiChangeStance_Timer = urand(20000, 25000);
+
+            m_uiReflection_Timer = 8000;
+            m_uiKnockAway_Timer = 20000;
+            m_uiPummel_Timer = 10000;
+            m_uiIronform_Timer = 25000;
+
+            m_uiIntercept_Timer = 5000;
+            m_uiWhirlwind_Timer = 10000;
+            m_uiCleave_Timer = 8000;
+
+            m_uiMortalStrike_Timer = 8000;
+            m_uiSlam_Timer = 10000;
+        }
+
         InstanceScript* instance;
 
         bool m_bIsChangingStance;
@@ -143,24 +166,7 @@ public:
                 if (!me->HasAura(SPELL_TEMPORARY_ELECTRICAL_CHARGE))
                     me->AddAura(SPELL_TEMPORARY_ELECTRICAL_CHARGE, me);
 
-            m_bIsChangingStance = false;
-
-            m_uiChargingStatus = 0;
-            m_uiCharge_Timer = 1000;
-
-            m_uiChangeStance_Timer = urand(20000, 25000);
-
-            m_uiReflection_Timer = 8000;
-            m_uiKnockAway_Timer = 20000;
-            m_uiPummel_Timer = 10000;
-            m_uiIronform_Timer = 25000;
-
-            m_uiIntercept_Timer = 5000;
-            m_uiWhirlwind_Timer = 10000;
-            m_uiCleave_Timer = 8000;
-
-            m_uiMortalStrike_Timer = 8000;
-            m_uiSlam_Timer = 10000;
+            Initialize();
 
             for (uint8 i = 0; i < 2; ++i)
             {
@@ -393,9 +399,16 @@ public:
     {
         npc_stormforged_lieutenantAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            m_uiArcWeld_Timer = urand(20000, 21000);
+            m_uiRenewSteel_Timer = urand(10000, 11000);
+        }
+
         InstanceScript* instance;
 
         uint32 m_uiArcWeld_Timer;
@@ -403,8 +416,7 @@ public:
 
         void Reset() override
         {
-            m_uiArcWeld_Timer = urand(20000, 21000);
-            m_uiRenewSteel_Timer = urand(10000, 11000);
+            Initialize();
         }
 
         void EnterCombat(Unit* who) override
diff --git a/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_ionar.cpp b/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_ionar.cpp
index ae48dd7aa9a..ddd88681a05 100644
--- a/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_ionar.cpp
+++ b/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_ionar.cpp
@@ -76,9 +76,23 @@ public:
     {
         boss_ionarAI(Creature* creature) : ScriptedAI(creature), lSparkList(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            bIsSplitPhase = true;
+            bHasDispersed = false;
+
+            uiSplitTimer = 25 * IN_MILLISECONDS;
+
+            uiStaticOverloadTimer = urand(5 * IN_MILLISECONDS, 6 * IN_MILLISECONDS);
+            uiBallLightningTimer = urand(10 * IN_MILLISECONDS, 11 * IN_MILLISECONDS);
+
+            uiDisperseHealth = 45 + urand(0, 10);
+        }
+
         InstanceScript* instance;
 
         SummonList lSparkList;
@@ -97,15 +111,7 @@ public:
         {
             lSparkList.DespawnAll();
 
-            bIsSplitPhase = true;
-            bHasDispersed = false;
-
-            uiSplitTimer = 25*IN_MILLISECONDS;
-
-            uiStaticOverloadTimer = urand(5*IN_MILLISECONDS, 6*IN_MILLISECONDS);
-            uiBallLightningTimer = urand(10*IN_MILLISECONDS, 11*IN_MILLISECONDS);
-
-            uiDisperseHealth = 45 + urand(0, 10);
+            Initialize();
 
             me->RemoveFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NON_ATTACKABLE|UNIT_FLAG_NOT_SELECTABLE|UNIT_FLAG_DISABLE_MOVE);
 
@@ -297,16 +303,22 @@ public:
     {
         npc_spark_of_ionarAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiCheckTimer = 2 * IN_MILLISECONDS;
+        }
+
         InstanceScript* instance;
 
         uint32 uiCheckTimer;
 
         void Reset() override
         {
-            uiCheckTimer = 2*IN_MILLISECONDS;
+            Initialize();
             me->SetReactState(REACT_PASSIVE);
         }
 
diff --git a/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_loken.cpp b/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_loken.cpp
index 98d7d629756..fc29369c28f 100644
--- a/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_loken.cpp
+++ b/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_loken.cpp
@@ -74,9 +74,19 @@ public:
     {
         boss_lokenAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            m_uiArcLightning_Timer = 15000;
+            m_uiLightningNova_Timer = 20000;
+            m_uiResumePulsingShockwave_Timer = 1000;
+
+            m_uiHealthAmountModifier = 1;
+        }
+
         InstanceScript* instance;
 
         uint32 m_uiArcLightning_Timer;
@@ -87,11 +97,7 @@ public:
 
         void Reset() override
         {
-            m_uiArcLightning_Timer = 15000;
-            m_uiLightningNova_Timer = 20000;
-            m_uiResumePulsingShockwave_Timer = 1000;
-
-            m_uiHealthAmountModifier = 1;
+            Initialize();
 
             instance->SetBossState(DATA_LOKEN, NOT_STARTED);
             instance->DoStopTimedAchievement(ACHIEVEMENT_TIMED_TYPE_EVENT, ACHIEV_TIMELY_DEATH_START_EVENT);
diff --git a/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_volkhan.cpp b/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_volkhan.cpp
index 31805d3404f..4ca94f69c5b 100644
--- a/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_volkhan.cpp
+++ b/src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_volkhan.cpp
@@ -78,9 +78,26 @@ public:
     {
         boss_volkhanAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            m_bIsStriking = false;
+            m_bHasTemper = false;
+            m_bCanShatterGolem = false;
+
+            m_uiPause_Timer = 3500;
+            m_uiShatteringStomp_Timer = 0;
+            m_uiShatter_Timer = 5000;
+            m_uiDelay_Timer = 1000;
+            m_uiSummonPhase = 0;
+            GolemsShattered = 0;
+
+            m_uiHealthAmountModifier = 1;
+        }
+
         InstanceScript* instance;
 
         std::list<uint64> m_lGolemGUIDList;
@@ -100,18 +117,7 @@ public:
 
         void Reset() override
         {
-            m_bIsStriking = false;
-            m_bHasTemper = false;
-            m_bCanShatterGolem = false;
-
-            m_uiPause_Timer = 3500;
-            m_uiShatteringStomp_Timer = 0;
-            m_uiShatter_Timer = 5000;
-            m_uiDelay_Timer = 1000;
-            m_uiSummonPhase = 0;
-            GolemsShattered = 0;
-
-            m_uiHealthAmountModifier = 1;
+            Initialize();
 
             DespawnGolem();
             m_lGolemGUIDList.clear();
@@ -362,7 +368,19 @@ public:
 
     struct npc_molten_golemAI : public ScriptedAI
     {
-        npc_molten_golemAI(Creature* creature) : ScriptedAI(creature) { }
+        npc_molten_golemAI(Creature* creature) : ScriptedAI(creature)
+        {
+            Initialize();
+        }
+
+        void Initialize()
+        {
+            m_bIsFrozen = false;
+
+            m_uiBlast_Timer = 20000;
+            m_uiDeathDelay_Timer = 0;
+            m_uiImmolation_Timer = 5000;
+        }
 
         bool m_bIsFrozen;
 
@@ -372,11 +390,7 @@ public:
 
         void Reset() override
         {
-            m_bIsFrozen = false;
-
-            m_uiBlast_Timer = 20000;
-            m_uiDeathDelay_Timer = 0;
-            m_uiImmolation_Timer = 5000;
+            Initialize();
         }
 
         void AttackStart(Unit* who) override
diff --git a/src/server/scripts/Northrend/Ulduar/HallsOfStone/boss_sjonnir.cpp b/src/server/scripts/Northrend/Ulduar/HallsOfStone/boss_sjonnir.cpp
index 0337a603e3b..63000df133e 100644
--- a/src/server/scripts/Northrend/Ulduar/HallsOfStone/boss_sjonnir.cpp
+++ b/src/server/scripts/Northrend/Ulduar/HallsOfStone/boss_sjonnir.cpp
@@ -76,12 +76,20 @@ class boss_sjonnir : public CreatureScript
 
         struct boss_sjonnirAI : public BossAI
         {
-            boss_sjonnirAI(Creature* creature) : BossAI(creature, DATA_SJONNIR) { }
+            boss_sjonnirAI(Creature* creature) : BossAI(creature, DATA_SJONNIR)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                abuseTheOoze = 0;
+            }
 
             void Reset() override
             {
                 _Reset();
-                abuseTheOoze = 0;
+                Initialize();
             }
 
             void EnterCombat(Unit* who) override
@@ -211,13 +219,21 @@ class npc_malformed_ooze : public CreatureScript
 
         struct npc_malformed_oozeAI : public ScriptedAI
         {
-            npc_malformed_oozeAI(Creature* creature) : ScriptedAI(creature) { }
+            npc_malformed_oozeAI(Creature* creature) : ScriptedAI(creature)
+            {
+                Initialize();
+            }
 
-            void Reset() override
+            void Initialize()
             {
                 _mergeTimer = 10000;
             }
 
+            void Reset() override
+            {
+                Initialize();
+            }
+
             void UpdateAI(uint32 diff) override
             {
                 if (_mergeTimer <= diff)
diff --git a/src/server/scripts/Northrend/Ulduar/HallsOfStone/halls_of_stone.cpp b/src/server/scripts/Northrend/Ulduar/HallsOfStone/halls_of_stone.cpp
index 4ff0bd1e5cb..11f616e8550 100644
--- a/src/server/scripts/Northrend/Ulduar/HallsOfStone/halls_of_stone.cpp
+++ b/src/server/scripts/Northrend/Ulduar/HallsOfStone/halls_of_stone.cpp
@@ -138,10 +138,22 @@ public:
     {
         npc_tribuna_controllerAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
             SetCombatMovement(false);
         }
 
+        void Initialize()
+        {
+            uiKaddrakEncounterTimer = 1500;
+            uiMarnakEncounterTimer = 10000;
+            uiAbedneumEncounterTimer = 10000;
+
+            bKaddrakActivated = false;
+            bMarnakActivated = false;
+            bAbedneumActivated = false;
+        }
+
         InstanceScript* instance;
 
         uint32 uiKaddrakEncounterTimer;
@@ -156,13 +168,7 @@ public:
 
         void Reset() override
         {
-            uiKaddrakEncounterTimer = 1500;
-            uiMarnakEncounterTimer = 10000;
-            uiAbedneumEncounterTimer = 10000;
-
-            bKaddrakActivated = false;
-            bMarnakActivated = false;
-            bAbedneumActivated = false;
+            Initialize();
 
             instance->HandleGameObject(instance->GetData64(DATA_GO_KADDRAK), false);
             instance->HandleGameObject(instance->GetData64(DATA_GO_MARNAK), false);
@@ -290,9 +296,20 @@ public:
     {
         npc_brann_hosAI(Creature* creature) : npc_escortAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            bIsLowHP = false;
+            bIsBattle = false;
+            uiStep = 0;
+            uiPhaseTimer = 0;
+            uiControllerGUID = 0;
+            brannSparklinNews = true;
+        }
+
         uint32 uiStep;
         uint32 uiPhaseTimer;
 
@@ -309,12 +326,7 @@ public:
         {
             if (!HasEscortState(STATE_ESCORT_ESCORTING))
             {
-                bIsLowHP = false;
-                bIsBattle = false;
-                uiStep = 0;
-                uiPhaseTimer = 0;
-                uiControllerGUID = 0;
-                brannSparklinNews = true;
+                Initialize();
 
                 DespawnDwarf();
 
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_algalon_the_observer.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_algalon_the_observer.cpp
index 595dcecd554..3c073578d49 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_algalon_the_observer.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_algalon_the_observer.cpp
@@ -301,19 +301,25 @@ class boss_algalon_the_observer : public CreatureScript
         {
             boss_algalon_the_observerAI(Creature* creature) : BossAI(creature, BOSS_ALGALON)
             {
+                Initialize();
                 _firstPull = true;
                 _fedOnTears = false;
             }
 
-            void Reset() override
+            void Initialize()
             {
-                _Reset();
-                me->SetReactState(REACT_PASSIVE);
                 _phaseTwo = false;
                 _fightWon = false;
                 _hasYelled = false;
             }
 
+            void Reset() override
+            {
+                _Reset();
+                me->SetReactState(REACT_PASSIVE);
+                Initialize();
+            }
+
             void KilledUnit(Unit* victim) override
             {
                 if (victim->GetTypeId() == TYPEID_UNIT)
@@ -715,13 +721,19 @@ class npc_living_constellation : public CreatureScript
         {
             npc_living_constellationAI(Creature* creature) : CreatureAI(creature)
             {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                _isActive = false;
             }
 
             void Reset() override
             {
                 _events.Reset();
                 _events.ScheduleEvent(EVENT_ARCANE_BARRAGE, 2500);
-                _isActive = false;
+                Initialize();
             }
 
             uint32 GetData(uint32 /*type*/) const override
@@ -858,6 +870,7 @@ class npc_brann_bronzebeard_algalon : public CreatureScript
         {
             npc_brann_bronzebeard_algalonAI(Creature* creature) : CreatureAI(creature)
             {
+                _currentPoint = 0;
             }
 
             void DoAction(int32 action) override
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_assembly_of_iron.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_assembly_of_iron.cpp
index 60698aac95e..80b3882593c 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_assembly_of_iron.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_assembly_of_iron.cpp
@@ -138,14 +138,22 @@ class boss_steelbreaker : public CreatureScript
 
         struct boss_steelbreakerAI : public BossAI
         {
-            boss_steelbreakerAI(Creature* creature) : BossAI(creature, BOSS_ASSEMBLY_OF_IRON) { }
+            boss_steelbreakerAI(Creature* creature) : BossAI(creature, BOSS_ASSEMBLY_OF_IRON)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                phase = 0;
+            }
 
             uint32 phase;
 
             void Reset() override
             {
                 _Reset();
-                phase = 0;
+                Initialize();
                 me->RemoveAllAuras();
             }
 
@@ -275,14 +283,22 @@ class boss_runemaster_molgeim : public CreatureScript
 
         struct boss_runemaster_molgeimAI : public BossAI
         {
-            boss_runemaster_molgeimAI(Creature* creature) : BossAI(creature, BOSS_ASSEMBLY_OF_IRON) { }
+            boss_runemaster_molgeimAI(Creature* creature) : BossAI(creature, BOSS_ASSEMBLY_OF_IRON)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                phase = 0;
+            }
 
             uint32 phase;
 
             void Reset() override
             {
                 _Reset();
-                phase = 0;
+                Initialize();
                 me->RemoveAllAuras();
             }
 
@@ -432,14 +448,22 @@ class boss_stormcaller_brundir : public CreatureScript
 
         struct boss_stormcaller_brundirAI : public BossAI
         {
-            boss_stormcaller_brundirAI(Creature* creature) : BossAI(creature, BOSS_ASSEMBLY_OF_IRON) { }
+            boss_stormcaller_brundirAI(Creature* creature) : BossAI(creature, BOSS_ASSEMBLY_OF_IRON)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                phase = 0;
+            }
 
             uint32 phase;
 
             void Reset() override
             {
                 _Reset();
-                phase = 0;
+                Initialize();
                 me->RemoveAllAuras();
                 me->SetDisableGravity(false);
                 me->ApplySpellImmune(0, IMMUNITY_MECHANIC, MECHANIC_INTERRUPT, false);  // Should be interruptable unless overridden by spell (Overload)
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_auriaya.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_auriaya.cpp
index f0b8e123c63..34c5344e1cf 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_auriaya.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_auriaya.cpp
@@ -107,17 +107,23 @@ class boss_auriaya : public CreatureScript
         {
             boss_auriayaAI(Creature* creature) : BossAI(creature, BOSS_AURIAYA)
             {
+                Initialize();
             }
 
-            void Reset() override
+            void Initialize()
             {
-                _Reset();
                 DefenderGUID = 0;
                 defenderLives = 8;
                 crazyCatLady = true;
                 nineLives = false;
             }
 
+            void Reset() override
+            {
+                _Reset();
+                Initialize();
+            }
+
             void EnterCombat(Unit* /*who*/) override
             {
                 _EnterCombat();
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp
index 071cf5bf14a..892634dfc92 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_flame_leviathan.cpp
@@ -226,14 +226,12 @@ class boss_flame_leviathan : public CreatureScript
         {
             boss_flame_leviathanAI(Creature* creature) : BossAI(creature, BOSS_LEVIATHAN), vehicle(creature->GetVehicleKit())
             {
+                Initialize();
+                _pursueTarget = 0;
             }
 
-            void InitializeAI() override
+            void Initialize()
             {
-                ASSERT(vehicle);
-                if (!me->isDead())
-                    Reset();
-
                 ActiveTowersCount = 4;
                 Shutdown = 0;
                 ActiveTowers = false;
@@ -243,6 +241,15 @@ class boss_flame_leviathan : public CreatureScript
                 towerOfFrost = false;
                 Shutout = true;
                 Unbroken = true;
+            }
+
+            void InitializeAI() override
+            {
+                ASSERT(vehicle);
+                if (!me->isDead())
+                    Reset();
+
+                Initialize();
 
                 DoCast(SPELL_INVIS_AND_STEALTH_DETECT);
 
@@ -634,13 +641,19 @@ class boss_flame_leviathan_defense_cannon : public CreatureScript
         {
             boss_flame_leviathan_defense_cannonAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                NapalmTimer = 5 * IN_MILLISECONDS;
             }
 
             uint32 NapalmTimer;
 
             void Reset() override
             {
-                NapalmTimer = 5*IN_MILLISECONDS;
+                Initialize();
                 DoCast(me, AURA_STEALTH_DETECTION);
             }
 
@@ -781,14 +794,20 @@ class npc_mechanolift : public CreatureScript
         {
             npc_mechanoliftAI(Creature* creature) : PassiveAI(creature)
             {
+                Initialize();
                 ASSERT(me->GetVehicleKit());
             }
 
+            void Initialize()
+            {
+                MoveTimer = 0;
+            }
+
             uint32 MoveTimer;
 
             void Reset() override
             {
-                MoveTimer = 0;
+                Initialize();
                 me->GetMotionMaster()->MoveRandom(50);
             }
 
@@ -956,11 +975,17 @@ public:
     {
         npc_mimirons_infernoAI(Creature* creature) : npc_escortAI(creature)
         {
+            Initialize();
             me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NON_ATTACKABLE | UNIT_FLAG_NOT_SELECTABLE);
             me->CastSpell(me, AURA_DUMMY_YELLOW, true);
             me->SetReactState(REACT_PASSIVE);
         }
 
+        void Initialize()
+        {
+            infernoTimer = 2000;
+        }
+
         void WaypointReached(uint32 /*waypointId*/) override
         {
 
@@ -968,7 +993,7 @@ public:
 
         void Reset() override
         {
-            infernoTimer = 2000;
+            Initialize();
         }
 
         uint32 infernoTimer;
@@ -1047,14 +1072,20 @@ class npc_freyas_ward : public CreatureScript
         {
             npc_freyas_wardAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 me->CastSpell(me, AURA_DUMMY_GREEN, true);
             }
 
+            void Initialize()
+            {
+                summonTimer = 5000;
+            }
+
             uint32 summonTimer;
 
             void Reset() override
             {
-                summonTimer = 5000;
+                Initialize();
             }
 
             void UpdateAI(uint32 diff) override
@@ -1090,14 +1121,20 @@ class npc_freya_ward_summon : public CreatureScript
         {
             npc_freya_ward_summonAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 creature->GetMotionMaster()->MoveRandom(100);
             }
 
+            void Initialize()
+            {
+                lashTimer = 5000;
+            }
+
             uint32 lashTimer;
 
             void Reset() override
             {
-                lashTimer = 5000;
+                Initialize();
             }
 
             void UpdateAI(uint32 diff) override
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_freya.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_freya.cpp
index 68bdbe0fdf3..ecebeb8d4e5 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_freya.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_freya.cpp
@@ -267,26 +267,16 @@ class boss_freya : public CreatureScript
 
         struct boss_freyaAI : public BossAI
         {
-            boss_freyaAI(Creature* creature) : BossAI(creature, BOSS_FREYA) { }
-
-            uint64 ElementalGUID[3][2];
-
-            uint32 deforestation[6][2];
-            uint32 elementalTimer[2];
-            uint32 diffTimer;
-            uint8 trioWaveCount;
-            uint8 trioWaveController;
-            uint8 waveCount;
-            uint8 elderCount;
-            uint8 attunedToNature;
-
-            bool checkElementalAlive[2];
-            bool trioDefeated[2];
-            bool random[3];
+            boss_freyaAI(Creature* creature) : BossAI(creature, BOSS_FREYA)
+            {
+                Initialize();
+                memset(elementalTimer, 0, sizeof(elementalTimer));
+                diffTimer = 0;
+                attunedToNature = 0;
+            }
 
-            void Reset() override
+            void Initialize()
             {
-                _Reset();
                 trioWaveCount = 0;
                 trioWaveController = 0;
                 waveCount = 0;
@@ -307,6 +297,27 @@ class boss_freya : public CreatureScript
                     random[n] = false;
             }
 
+            uint64 ElementalGUID[3][2];
+
+            uint32 deforestation[6][2];
+            uint32 elementalTimer[2];
+            uint32 diffTimer;
+            uint8 trioWaveCount;
+            uint8 trioWaveController;
+            uint8 waveCount;
+            uint8 elderCount;
+            uint8 attunedToNature;
+
+            bool checkElementalAlive[2];
+            bool trioDefeated[2];
+            bool random[3];
+
+            void Reset() override
+            {
+                _Reset();
+                Initialize();
+            }
+
             void KilledUnit(Unit* who) override
             {
                 if (who->GetTypeId() == TYPEID_PLAYER)
@@ -689,8 +700,6 @@ class boss_elder_brightleaf : public CreatureScript
                 events.ScheduleEvent(EVENT_SOLAR_FLARE, urand(5000, 7000));
                 events.ScheduleEvent(EVENT_UNSTABLE_SUN_BEAM, urand(7000, 12000));
                 events.ScheduleEvent(EVENT_FLUX, 5000);
-                elderCount = 0;
-                lumberjack = false;
             }
 
             void KilledUnit(Unit* who) override
@@ -758,9 +767,6 @@ class boss_elder_brightleaf : public CreatureScript
                     }
                 }
 
-                if (lumberjack)
-                    lumberjackTimer += diff;
-
                 DoMeleeAttackIfReady();
             }
 
@@ -768,21 +774,12 @@ class boss_elder_brightleaf : public CreatureScript
             {
                 switch (action)
                 {
-                    case ACTION_ELDER_DEATH:
-                        ++elderCount;
-                        lumberjack = true;
-                        break;
                     case ACTION_ELDER_FREYA_KILLED:
                         me->DespawnOrUnsummon(10000);
                         _JustDied();
                         break;
                 }
             }
-
-        private:
-            uint32 lumberjackTimer;
-            uint8 elderCount;
-            bool lumberjack;
         };
 
         CreatureAI* GetAI(Creature* creature) const override
@@ -810,8 +807,6 @@ class boss_elder_stonebark : public CreatureScript
                 events.ScheduleEvent(EVENT_TREMOR, urand(10000, 12000));
                 events.ScheduleEvent(EVENT_FISTS, urand(25000, 35000));
                 events.ScheduleEvent(EVENT_BARK, urand(37500, 40000));
-                elderCount = 0;
-                lumberjack = false;
             }
 
             void KilledUnit(Unit* who) override
@@ -885,9 +880,6 @@ class boss_elder_stonebark : public CreatureScript
                     }
                 }
 
-                if (lumberjack)
-                    lumberjackTimer += diff;
-
                 DoMeleeAttackIfReady();
             }
 
@@ -895,21 +887,12 @@ class boss_elder_stonebark : public CreatureScript
             {
                 switch (action)
                 {
-                    case ACTION_ELDER_DEATH:
-                        ++elderCount;
-                        lumberjack = true;
-                        break;
                     case ACTION_ELDER_FREYA_KILLED:
                         me->DespawnOrUnsummon(10000);
                         _JustDied();
                         break;
                 }
             }
-
-        private:
-            uint32 lumberjackTimer;
-            uint8 elderCount;
-            bool lumberjack;
         };
 
         CreatureAI* GetAI(Creature* creature) const override
@@ -937,8 +920,6 @@ class boss_elder_ironbranch : public CreatureScript
                 events.ScheduleEvent(EVENT_IMPALE, urand(18000, 22000));
                 events.ScheduleEvent(EVENT_IRON_ROOTS, urand(12000, 17000));
                 events.ScheduleEvent(EVENT_THORN_SWARM, urand(7500, 12500));
-                elderCount = 0;
-                lumberjack = false;
             }
 
             void KilledUnit(Unit* who) override
@@ -999,9 +980,6 @@ class boss_elder_ironbranch : public CreatureScript
                     }
                 }
 
-                if (lumberjack)
-                    lumberjackTimer += diff;
-
                 DoMeleeAttackIfReady();
             }
 
@@ -1009,21 +987,12 @@ class boss_elder_ironbranch : public CreatureScript
             {
                 switch (action)
                 {
-                    case ACTION_ELDER_DEATH:
-                        ++elderCount;
-                        lumberjack = true;
-                        break;
                     case ACTION_ELDER_FREYA_KILLED:
                         me->DespawnOrUnsummon(10000);
                         _JustDied();
                         break;
                 }
             }
-
-        private:
-            uint32 lumberjackTimer;
-            uint8 elderCount;
-            bool lumberjack;
         };
 
         CreatureAI* GetAI(Creature* creature) const override
@@ -1041,15 +1010,21 @@ class npc_detonating_lasher : public CreatureScript
         {
             npc_detonating_lasherAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 me->ApplySpellImmune(0, IMMUNITY_STATE, SPELL_AURA_MOD_TAUNT, true);
             }
 
-            void Reset() override
+            void Initialize()
             {
                 lashTimer = 5000;
                 changeTargetTimer = 7500;
             }
 
+            void Reset() override
+            {
+                Initialize();
+            }
+
             void UpdateAI(uint32 diff) override
             {
                 if (!UpdateVictim())
@@ -1099,16 +1074,24 @@ class npc_ancient_water_spirit : public CreatureScript
         {
             npc_ancient_water_spiritAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = me->GetInstanceScript();
                 if (Creature* Freya = ObjectAccessor::GetCreature(*me, instance->GetData64(BOSS_FREYA)))
                     waveCount = ENSURE_AI(boss_freya::boss_freyaAI, Freya->AI())->trioWaveCount;
+                else
+                    waveCount = 0;
             }
 
-            void Reset() override
+            void Initialize()
             {
                 tidalWaveTimer = 10000;
             }
 
+            void Reset() override
+            {
+                Initialize();
+            }
+
             void UpdateAI(uint32 diff) override
             {
                 if (!UpdateVictim())
@@ -1159,17 +1142,25 @@ class npc_storm_lasher : public CreatureScript
         {
             npc_storm_lasherAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = me->GetInstanceScript();
                 if (Creature* Freya = ObjectAccessor::GetCreature(*me, instance->GetData64(BOSS_FREYA)))
                     waveCount = ENSURE_AI(boss_freya::boss_freyaAI, Freya->AI())->trioWaveCount;
+                else
+                    waveCount = 0;
             }
 
-            void Reset() override
+            void Initialize()
             {
                 lightningLashTimer = 10000;
                 stormboltTimer = 5000;
             }
 
+            void Reset() override
+            {
+                Initialize();
+            }
+
             void UpdateAI(uint32 diff) override
             {
                 if (!UpdateVictim())
@@ -1229,6 +1220,8 @@ class npc_snaplasher : public CreatureScript
                 instance = me->GetInstanceScript();
                 if (Creature* Freya = ObjectAccessor::GetCreature(*me, instance->GetData64(BOSS_FREYA)))
                     waveCount = ENSURE_AI(boss_freya::boss_freyaAI, Freya->AI())->trioWaveCount;
+                else
+                    waveCount = 0;
             }
 
             void UpdateAI(uint32 /*diff*/) override
@@ -1271,12 +1264,18 @@ class npc_ancient_conservator : public CreatureScript
         {
             npc_ancient_conservatorAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
             }
 
-            void Reset() override
+            void Initialize()
             {
                 natureFuryTimer = 7500;
                 healthySporeTimer = 3500;
+            }
+
+            void Reset() override
+            {
+                Initialize();
                 SummonHealthySpores(2);
             }
 
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_general_vezax.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_general_vezax.cpp
index 196e410f239..5d4ddf1865c 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_general_vezax.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_general_vezax.cpp
@@ -105,6 +105,15 @@ class boss_general_vezax : public CreatureScript
         {
             boss_general_vezaxAI(Creature* creature) : BossAI(creature, BOSS_VEZAX)
             {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                shadowDodger = true;
+                smellSaronite = true;
+                animusDead = false;
+                vaporCount = 0;
             }
 
             bool shadowDodger;
@@ -116,10 +125,7 @@ class boss_general_vezax : public CreatureScript
             {
                 _Reset();
 
-                shadowDodger = true;
-                smellSaronite = true;
-                animusDead = false;
-                vaporCount = 0;
+                Initialize();
             }
 
             void EnterCombat(Unit* /*who*/) override
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_hodir.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_hodir.cpp
index a3d80beb546..42c0323a714 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_hodir.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_hodir.cpp
@@ -181,11 +181,18 @@ class npc_flash_freeze : public CreatureScript
         {
             npc_flash_freezeAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = me->GetInstanceScript();
                 me->SetDisplayId(me->GetCreatureTemplate()->Modelid2);
                 me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_DISABLE_MOVE | UNIT_FLAG_STUNNED | UNIT_FLAG_PACIFIED);
             }
 
+            void Initialize()
+            {
+                targetGUID = 0;
+                checkDespawnTimer = 1000;
+            }
+
             InstanceScript* instance;
 
             uint64 targetGUID;
@@ -193,8 +200,7 @@ class npc_flash_freeze : public CreatureScript
 
             void Reset() override
             {
-                targetGUID = 0;
-                checkDespawnTimer = 1000;
+                Initialize();
             }
 
             void UpdateAI(uint32 diff) override
@@ -312,9 +318,19 @@ class boss_hodir : public CreatureScript
         {
             boss_hodirAI(Creature* creature) : BossAI(creature, BOSS_HODIR)
             {
+                Initialize();
                 me->SetReactState(REACT_PASSIVE);
             }
 
+            void Initialize()
+            {
+                gettingColdInHereTimer = 0;
+                gettingColdInHere = false;
+                cheeseTheFreeze = false;
+                iHaveTheCoolestFriends = false;
+                iCouldSayThatThisCacheWasRare = false;
+            }
+
             uint32 gettingColdInHereTimer;
 
             bool gettingColdInHere;
@@ -324,11 +340,7 @@ class boss_hodir : public CreatureScript
 
             void Reset() override
             {
-                gettingColdInHereTimer = 0;
-                gettingColdInHere = false;
-                cheeseTheFreeze = false;
-                iHaveTheCoolestFriends = false;
-                iCouldSayThatThisCacheWasRare = false;
+                Initialize();
 
                 _Reset();
                 me->SetReactState(REACT_PASSIVE);
@@ -526,16 +538,22 @@ class npc_icicle : public CreatureScript
         {
             npc_icicleAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 me->SetDisplayId(me->GetCreatureTemplate()->Modelid1);
                 me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_DISABLE_MOVE | UNIT_FLAG_NON_ATTACKABLE | UNIT_FLAG_PACIFIED | UNIT_FLAG_NOT_SELECTABLE);
                 me->SetReactState(REACT_PASSIVE);
             }
 
+            void Initialize()
+            {
+                icicleTimer = 2500;
+            }
+
             uint32 icicleTimer;
 
             void Reset() override
             {
-                icicleTimer = 2500;
+                Initialize();
             }
 
             void UpdateAI(uint32 diff) override
@@ -574,16 +592,22 @@ class npc_snowpacked_icicle : public CreatureScript
         {
             npc_snowpacked_icicleAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 me->SetDisplayId(me->GetCreatureTemplate()->Modelid2);
                 me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_DISABLE_MOVE | UNIT_FLAG_NON_ATTACKABLE | UNIT_FLAG_NOT_SELECTABLE | UNIT_FLAG_PACIFIED);
                 me->SetReactState(REACT_PASSIVE);
             }
 
+            void Initialize()
+            {
+                despawnTimer = 12000;
+            }
+
             uint32 despawnTimer;
 
             void Reset() override
             {
-                despawnTimer = 12000;
+                Initialize();
             }
 
             void UpdateAI(uint32 diff) override
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_ignis.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_ignis.cpp
index 28a87b37f5b..f0f918f7e39 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_ignis.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_ignis.cpp
@@ -118,9 +118,17 @@ class boss_ignis : public CreatureScript
         {
             boss_ignis_AI(Creature* creature) : BossAI(creature, BOSS_IGNIS), _vehicle(me->GetVehicleKit())
             {
+                Initialize();
                 ASSERT(_vehicle);
             }
 
+            void Initialize()
+            {
+                _slagPotGUID = 0;
+                _shattered = false;
+                _firstConstructKill = 0;
+            }
+
             void Reset() override
             {
                 _Reset();
@@ -140,9 +148,7 @@ class boss_ignis : public CreatureScript
                 events.ScheduleEvent(EVENT_CONSTRUCT, 15000);
                 events.ScheduleEvent(EVENT_END_POT, 40000);
                 events.ScheduleEvent(EVENT_BERSERK, 480000);
-                _slagPotGUID = 0;
-                _shattered = false;
-                _firstConstructKill = 0;
+                Initialize();
                 instance->DoStartTimedAchievement(ACHIEVEMENT_TIMED_TYPE_EVENT, ACHIEVEMENT_IGNIS_START_EVENT);
             }
 
@@ -298,14 +304,20 @@ class npc_iron_construct : public CreatureScript
         {
             npc_iron_constructAI(Creature* creature) : ScriptedAI(creature), _instance(creature->GetInstanceScript())
             {
+                Initialize();
                 creature->SetReactState(REACT_PASSIVE);
             }
 
-            void Reset() override
+            void Initialize()
             {
                 _brittled = false;
             }
 
+            void Reset() override
+            {
+                Initialize();
+            }
+
             void DamageTaken(Unit* /*attacker*/, uint32& damage) override
             {
                 if (me->HasAura(SPELL_BRITTLE) && damage >= 5000)
@@ -365,12 +377,19 @@ class npc_scorch_ground : public CreatureScript
         {
             npc_scorch_groundAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_DISABLE_MOVE |UNIT_FLAG_NOT_SELECTABLE | UNIT_FLAG_PACIFIED);
                 creature->SetDisplayId(16925); //model 2 in db cannot overwrite wdb fields
             }
 
-            void MoveInLineOfSight(Unit* who) override
+            void Initialize()
+            {
+                _heat = false;
+                _constructGUID = 0;
+                _heatTimer = 0;
+            }
 
+            void MoveInLineOfSight(Unit* who) override
             {
                 if (!_heat)
                 {
@@ -387,10 +406,8 @@ class npc_scorch_ground : public CreatureScript
 
             void Reset() override
             {
-                _heat = false;
+                Initialize();
                 DoCast(me, SPELL_GROUND);
-                _constructGUID = 0;
-                _heatTimer = 0;
             }
 
             void UpdateAI(uint32 uiDiff) override
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_razorscale.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_razorscale.cpp
index f5fe255fdf3..d53ac6d91d6 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_razorscale.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_razorscale.cpp
@@ -327,8 +327,19 @@ class boss_razorscale : public CreatureScript
         {
             boss_razorscaleAI(Creature* creature) : BossAI(creature, BOSS_RAZORSCALE)
             {
+                Initialize();
                 // Do not let Razorscale be affected by Battle Shout buff
                 me->ApplySpellImmune(0, IMMUNITY_ID, (SPELL_BATTLE_SHOUT), true);
+                FlyCount = 0;
+                EnrageTimer = 0;
+                Enraged = false;
+                phase = PHASE_GROUND;
+            }
+
+            void Initialize()
+            {
+                PermaGround = false;
+                HarpoonCounter = 0;
             }
 
             Phases phase;
@@ -345,8 +356,7 @@ class boss_razorscale : public CreatureScript
                 me->SetCanFly(true);
                 me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NOT_SELECTABLE);
                 me->SetReactState(REACT_PASSIVE);
-                PermaGround = false;
-                HarpoonCounter = 0;
+                Initialize();
                 if (Creature* commander = ObjectAccessor::GetCreature(*me, instance->GetData64(DATA_EXPEDITION_COMMANDER)))
                     commander->AI()->DoAction(ACTION_COMMANDER_RESET);
             }
@@ -594,7 +604,16 @@ class npc_expedition_commander : public CreatureScript
         {
             npc_expedition_commanderAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = me->GetInstanceScript();
+                memset(Engineer, 0, sizeof(Engineer));
+                memset(Defender, 0, sizeof(Defender));
+            }
+
+            void Initialize()
+            {
+                AttackStartTimer = 0;
+                Phase = 0;
                 Greet = false;
             }
 
@@ -604,14 +623,12 @@ class npc_expedition_commander : public CreatureScript
             bool Greet;
             uint32 AttackStartTimer;
             uint8  Phase;
-            Creature* Engineer[4];
-            Creature* Defender[4];
+            uint64 Engineer[4];
+            uint64 Defender[4];
 
             void Reset() override
             {
-                AttackStartTimer = 0;
-                Phase = 0;
-                Greet = false;
+                Initialize();
                 summons.clear();
             }
 
@@ -659,31 +676,40 @@ class npc_expedition_commander : public CreatureScript
                         case 2:
                             for (uint8 n = 0; n < RAID_MODE(2, 4); n++)
                             {
-                                Engineer[n] = me->SummonCreature(NPC_ENGINEER, PosEngSpawn, TEMPSUMMON_CORPSE_TIMED_DESPAWN, 3000);
-                                Engineer[n]->SetWalk(false);
-                                Engineer[n]->SetSpeed(MOVE_RUN, 0.5f);
-                                Engineer[n]->SetHomePosition(PosEngRepair[n]);
-                                Engineer[n]->GetMotionMaster()->MoveTargetedHome();
+                                if (Creature* summonedEngineer = me->SummonCreature(NPC_ENGINEER, PosEngSpawn, TEMPSUMMON_CORPSE_TIMED_DESPAWN, 3000))
+                                {
+                                    summonedEngineer->SetWalk(false);
+                                    summonedEngineer->SetSpeed(MOVE_RUN, 0.5f);
+                                    summonedEngineer->SetHomePosition(PosEngRepair[n]);
+                                    summonedEngineer->GetMotionMaster()->MoveTargetedHome();
+                                    Engineer[n] = summonedEngineer->GetGUID();
+                                }
                             }
-                            Engineer[0]->AI()->Talk(SAY_AGGRO_3);
+                            if (Creature* firstSummon = ObjectAccessor::GetCreature(*me, Engineer[0]))
+                                firstSummon->AI()->Talk(SAY_AGGRO_3);
                             Phase = 3;
                             AttackStartTimer = 14000;
                             break;
                         case 3:
                             for (uint8 n = 0; n < 4; n++)
                             {
-                                Defender[n] = me->SummonCreature(NPC_DEFENDER, PosDefSpawn[n], TEMPSUMMON_CORPSE_TIMED_DESPAWN, 3000);
-                                Defender[n]->SetWalk(false);
-                                Defender[n]->SetHomePosition(PosDefCombat[n]);
-                                Defender[n]->GetMotionMaster()->MoveTargetedHome();
+                                if (Creature* summonedDefender = me->SummonCreature(NPC_DEFENDER, PosDefSpawn[n], TEMPSUMMON_CORPSE_TIMED_DESPAWN, 3000))
+                                {
+                                    summonedDefender->SetWalk(false);
+                                    summonedDefender->SetHomePosition(PosDefCombat[n]);
+                                    summonedDefender->GetMotionMaster()->MoveTargetedHome();
+                                    Defender[n] = summonedDefender->GetGUID();
+                                }
                             }
                             Phase = 4;
                             break;
                         case 4:
                             for (uint8 n = 0; n < RAID_MODE(2, 4); n++)
-                                Engineer[n]->SetUInt32Value(UNIT_NPC_EMOTESTATE, EMOTE_STATE_USE_STANDING);
+                                if (Creature* summonedEngineer = ObjectAccessor::GetCreature(*me, Engineer[n]))
+                                    summonedEngineer->SetUInt32Value(UNIT_NPC_EMOTESTATE, EMOTE_STATE_USE_STANDING);
                             for (uint8 n = 0; n < 4; ++n)
-                                Defender[n]->SetUInt32Value(UNIT_NPC_EMOTESTATE, EMOTE_STATE_READY2H);
+                                if (Creature* summonedDefender = ObjectAccessor::GetCreature(*me, Defender[n]))
+                                    summonedDefender->SetUInt32Value(UNIT_NPC_EMOTESTATE, EMOTE_STATE_READY2H);
                             Talk(SAY_AGGRO_2);
                             AttackStartTimer = 16000;
                             Phase = 5;
@@ -694,7 +720,8 @@ class npc_expedition_commander : public CreatureScript
                                 Razorscale->AI()->DoAction(ACTION_EVENT_START);
                                 me->SetInCombatWith(Razorscale);
                             }
-                            Engineer[0]->AI()->Talk(SAY_AGGRO_1);
+                            if (Creature* firstEngineer = ObjectAccessor::GetCreature(*me, Engineer[0]))
+                                firstEngineer->AI()->Talk(SAY_AGGRO_1);
                             Phase = 6;
                             break;
                     }
@@ -748,10 +775,20 @@ class npc_mole_machine_trigger : public CreatureScript
         {
             npc_mole_machine_triggerAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 SetCombatMovement(false);
                 me->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NON_ATTACKABLE | UNIT_FLAG_PACIFIED);
             }
 
+            void Initialize()
+            {
+                SummonGobTimer = 2000;
+                SummonNpcTimer = 6000;
+                DissapearTimer = 10000;
+                GobSummoned = false;
+                NpcSummoned = false;
+            }
+
             uint32 SummonGobTimer;
             uint32 SummonNpcTimer;
             uint32 DissapearTimer;
@@ -760,11 +797,7 @@ class npc_mole_machine_trigger : public CreatureScript
 
             void Reset() override
             {
-                SummonGobTimer = 2000;
-                SummonNpcTimer = 6000;
-                DissapearTimer = 10000;
-                GobSummoned = false;
-                NpcSummoned = false;
+                Initialize();
             }
 
             void UpdateAI(uint32 Diff) override
@@ -851,15 +884,23 @@ class npc_darkrune_watcher : public CreatureScript
 
         struct npc_darkrune_watcherAI : public ScriptedAI
         {
-            npc_darkrune_watcherAI(Creature* creature) : ScriptedAI(creature){ }
+            npc_darkrune_watcherAI(Creature* creature) : ScriptedAI(creature)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                ChainTimer = urand(10000, 15000);
+                LightTimer = urand(1000, 3000);
+            }
 
             uint32 ChainTimer;
             uint32 LightTimer;
 
             void Reset() override
             {
-                ChainTimer = urand(10000, 15000);
-                LightTimer = urand(1000, 3000);
+                Initialize();
             }
 
             void UpdateAI(uint32 Diff) override
@@ -900,14 +941,22 @@ class npc_darkrune_guardian : public CreatureScript
 
         struct npc_darkrune_guardianAI : public ScriptedAI
         {
-            npc_darkrune_guardianAI(Creature* creature) : ScriptedAI(creature){ }
+            npc_darkrune_guardianAI(Creature* creature) : ScriptedAI(creature)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                StormTimer = urand(3000, 6000);
+                killedByBreath = false;
+            }
 
             uint32 StormTimer;
 
             void Reset() override
             {
-                StormTimer = urand(3000, 6000);
-                killedByBreath = false;
+                Initialize();
             }
 
             uint32 GetData(uint32 type) const override
@@ -955,7 +1004,17 @@ class npc_darkrune_sentinel : public CreatureScript
 
         struct npc_darkrune_sentinelAI : public ScriptedAI
         {
-            npc_darkrune_sentinelAI(Creature* creature) : ScriptedAI(creature){ }
+            npc_darkrune_sentinelAI(Creature* creature) : ScriptedAI(creature)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                HeroicTimer = urand(4000, 8000);
+                WhirlTimer = urand(20000, 25000);
+                ShoutTimer = urand(15000, 30000);
+            }
 
             uint32 HeroicTimer;
             uint32 WhirlTimer;
@@ -963,9 +1022,7 @@ class npc_darkrune_sentinel : public CreatureScript
 
             void Reset() override
             {
-                HeroicTimer = urand(4000, 8000);
-                WhirlTimer = urand(20000, 25000);
-                ShoutTimer = urand(15000, 30000);
+                Initialize();
             }
 
             void UpdateAI(uint32 Diff) override
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_xt002.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_xt002.cpp
index 1d2b1b24322..3ec5109cbb9 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_xt002.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_xt002.cpp
@@ -196,6 +196,18 @@ class boss_xt002 : public CreatureScript
         {
             boss_xt002_AI(Creature* creature) : BossAI(creature, BOSS_XT002)
             {
+                Initialize();
+                _transferHealth = 0;
+            }
+
+            void Initialize()
+            {
+                _healthRecovered = false;
+                _gravityBombCasualty = false;
+                _hardMode = false;
+
+                _phase = 1;
+                _heartExposed = 0;
             }
 
             void Reset() override
@@ -206,12 +218,7 @@ class boss_xt002 : public CreatureScript
                 me->SetReactState(REACT_AGGRESSIVE);
                 DoCast(me, SPELL_STAND);
 
-                _healthRecovered = false;
-                _gravityBombCasualty = false;
-                _hardMode = false;
-
-                _phase = 1;
-                _heartExposed = 0;
+                Initialize();
 
                 instance->DoStopTimedAchievement(ACHIEVEMENT_TIMED_TYPE_EVENT, ACHIEV_MUST_DECONSTRUCT_FASTER);
             }
@@ -489,14 +496,20 @@ class npc_scrapbot : public CreatureScript
         {
             npc_scrapbotAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 _instance = me->GetInstanceScript();
             }
 
+            void Initialize()
+            {
+                _rangeCheckTimer = 500;
+            }
+
             void Reset() override
             {
                 me->SetReactState(REACT_PASSIVE);
 
-                _rangeCheckTimer = 500;
+                Initialize();
 
                 if (Creature* pXT002 = ObjectAccessor::GetCreature(*me, _instance->GetData64(BOSS_XT002)))
                     me->GetMotionMaster()->MoveFollow(pXT002, 0.0f, 0.0f);
@@ -546,14 +559,20 @@ class npc_pummeller : public CreatureScript
         {
             npc_pummellerAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 _instance = creature->GetInstanceScript();
             }
 
-            void Reset() override
+            void Initialize()
             {
                 _arcingSmashTimer = TIMER_ARCING_SMASH;
                 _trampleTimer = TIMER_TRAMPLE;
                 _uppercutTimer = TIMER_UPPERCUT;
+            }
+
+            void Reset() override
+            {
+                Initialize();
 
                 if (Creature* xt002 = ObjectAccessor::GetCreature(*me, _instance->GetData64(BOSS_XT002)))
                 {
@@ -647,12 +666,18 @@ class npc_boombot : public CreatureScript
         {
             npc_boombotAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 _instance = creature->GetInstanceScript();
             }
 
-            void Reset() override
+            void Initialize()
             {
                 _boomed = false;
+            }
+
+            void Reset() override
+            {
+                Initialize();
 
                 DoCast(SPELL_AURA_BOOMBOT); // For achievement
 
@@ -726,12 +751,18 @@ class npc_life_spark : public CreatureScript
         {
             npc_life_sparkAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                _shockTimer = 0; // first one is immediate.
             }
 
             void Reset() override
             {
                 DoCast(me, SPELL_STATIC_CHARGED);
-                _shockTimer = 0; // first one is immediate.
+                Initialize();
             }
 
             void UpdateAI(uint32 diff) override
diff --git a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_yogg_saron.cpp b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_yogg_saron.cpp
index 2471b705b90..d3012dc99ba 100644
--- a/src/server/scripts/Northrend/Ulduar/Ulduar/boss_yogg_saron.cpp
+++ b/src/server/scripts/Northrend/Ulduar/Ulduar/boss_yogg_saron.cpp
@@ -427,9 +427,17 @@ class boss_voice_of_yogg_saron : public CreatureScript
         {
             boss_voice_of_yogg_saronAI(Creature* creature) : BossAI(creature, BOSS_YOGG_SARON)
             {
+                Initialize();
                 SetCombatMovement(false);
             }
 
+            void Initialize()
+            {
+                _guardiansCount = 0;
+                _guardianTimer = 20000;
+                _illusionShattered = false;
+            }
+
             void MoveInLineOfSight(Unit* who) override
 
             {
@@ -467,9 +475,7 @@ class boss_voice_of_yogg_saron : public CreatureScript
                 instance->SetData(DATA_DRIVE_ME_CRAZY, uint32(true));
                 instance->DoStopTimedAchievement(ACHIEVEMENT_TIMED_TYPE_EVENT, ACHIEV_TIMED_START_EVENT);
 
-                _guardiansCount = 0;
-                _guardianTimer = 20000;
-                _illusionShattered = false;
+                Initialize();
 
                 bool clockwise = false;
                 std::list<TempSummon*> clouds;
@@ -1014,7 +1020,10 @@ class boss_brain_of_yogg_saron : public CreatureScript
 
         struct boss_brain_of_yogg_saronAI : public PassiveAI
         {
-            boss_brain_of_yogg_saronAI(Creature* creature) : PassiveAI(creature), _instance(creature->GetInstanceScript()), _summons(creature) { }
+            boss_brain_of_yogg_saronAI(Creature* creature) : PassiveAI(creature), _instance(creature->GetInstanceScript()), _summons(creature)
+            {
+                _tentaclesKilled = 0;
+            }
 
             void Reset() override
             {
@@ -1953,7 +1962,7 @@ class spell_yogg_saron_target_selectors : public SpellScriptLoader    // 63744,
 class SanityReduction : public SpellScript
 {
     public:
-        SanityReduction() : SpellScript() { }
+        SanityReduction() : SpellScript(), _stacks(0) { }
         SanityReduction(uint8 stacks) : SpellScript(), _stacks(stacks) { }
 
     void RemoveSanity(SpellEffIndex /*effIndex*/)
diff --git a/src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_ingvar_the_plunderer.cpp b/src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_ingvar_the_plunderer.cpp
index 7a1566df71d..ee52df58c80 100644
--- a/src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_ingvar_the_plunderer.cpp
+++ b/src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_ingvar_the_plunderer.cpp
@@ -264,6 +264,9 @@ class npc_annhylde_the_caller : public CreatureScript
         {
             npc_annhylde_the_callerAI(Creature* creature) : ScriptedAI(creature)
             {
+                x = 0.f;
+                y = 0.f;
+                z = 0.f;
                 _instance = creature->GetInstanceScript();
             }
 
diff --git a/src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_keleseth.cpp b/src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_keleseth.cpp
index eb60444f9c2..6e0dbecafb4 100644
--- a/src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_keleseth.cpp
+++ b/src/server/scripts/Northrend/UtgardeKeep/UtgardeKeep/boss_keleseth.cpp
@@ -115,7 +115,15 @@ class boss_keleseth : public CreatureScript
 
         struct boss_kelesethAI : public BossAI
         {
-            boss_kelesethAI(Creature* creature) : BossAI(creature, DATA_PRINCE_KELESETH) { }
+            boss_kelesethAI(Creature* creature) : BossAI(creature, DATA_PRINCE_KELESETH)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                onTheRocks = true;
+            }
 
             void Reset() override
             {
@@ -124,7 +132,7 @@ class boss_keleseth : public CreatureScript
                 events.ScheduleEvent(EVENT_FROST_TOMB, urand(14, 19)*IN_MILLISECONDS);
                 events.ScheduleEvent(EVENT_SUMMON_SKELETONS, 6*IN_MILLISECONDS);
 
-                onTheRocks = true;
+                Initialize();
             }
 
             void EnterCombat(Unit* who) override
diff --git a/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_palehoof.cpp b/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_palehoof.cpp
index 245cf46336d..b3285bd492e 100644
--- a/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_palehoof.cpp
+++ b/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_palehoof.cpp
@@ -92,20 +92,11 @@ public:
     {
         boss_palehoofAI(Creature* creature) : BossAI(creature, DATA_GORTOK_PALEHOOF)
         {
+            Initialize();
         }
 
-        uint32 uiArcingSmashTimer;
-        uint32 uiImpaleTimer;
-        uint32 uiWhiteringRoarTimer;
-        uint32 uiWaitingTimer;
-        Phase currentPhase;
-        uint8 AddCount;
-        Phase Sequence[4];
-
-        void Reset() override
+        void Initialize()
         {
-            _Reset();
-
             /// There is a good reason to store them like this, we are going to shuffle the order.
             for (uint32 i = PHASE_FRENZIED_WORGEN; i < PHASE_GORTOK_PALEHOOF; ++i)
                 Sequence[i] = Phase(i);
@@ -117,11 +108,25 @@ public:
             uiImpaleTimer = 12000;
             uiWhiteringRoarTimer = 10000;
 
-            me->GetMotionMaster()->MoveTargetedHome();
-
             AddCount = 0;
 
             currentPhase = PHASE_NONE;
+        }
+
+        uint32 uiArcingSmashTimer;
+        uint32 uiImpaleTimer;
+        uint32 uiWhiteringRoarTimer;
+        Phase currentPhase;
+        uint8 AddCount;
+        Phase Sequence[4];
+
+        void Reset() override
+        {
+            _Reset();
+
+            Initialize();
+
+            me->GetMotionMaster()->MoveTargetedHome();
 
             for (uint8 i = DATA_FRENZIED_WORGEN; i <= DATA_FEROCIOUS_RHINO; ++i)
                 if (Creature* temp = ObjectAccessor::GetCreature(*me, instance->GetData64(i)))
@@ -263,9 +268,17 @@ public:
     {
         npc_ravenous_furbolgAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiChainLightingTimer = 5000;
+            uiCrazedTimer = 10000;
+            uiTerrifyingRoarTimer = 15000;
+        }
+
         uint32 uiChainLightingTimer;
         uint32 uiCrazedTimer;
         uint32 uiTerrifyingRoarTimer;
@@ -274,9 +287,7 @@ public:
 
         void Reset() override
         {
-            uiChainLightingTimer = 5000;
-            uiCrazedTimer = 10000;
-            uiTerrifyingRoarTimer = 15000;
+            Initialize();
 
             me->GetMotionMaster()->MoveTargetedHome();
 
@@ -371,9 +382,17 @@ public:
     {
         npc_frenzied_worgenAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiMortalWoundTimer = 5000;
+            uiEnrage1Timer = 15000;
+            uiEnrage2Timer = 10000;
+        }
+
         uint32 uiMortalWoundTimer;
         uint32 uiEnrage1Timer;
         uint32 uiEnrage2Timer;
@@ -382,9 +401,7 @@ public:
 
         void Reset() override
         {
-            uiMortalWoundTimer = 5000;
-            uiEnrage1Timer = 15000;
-            uiEnrage2Timer = 10000;
+            Initialize();
 
             me->GetMotionMaster()->MoveTargetedHome();
 
@@ -481,9 +498,17 @@ public:
     {
         npc_ferocious_rhinoAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiStompTimer = 10000;
+            uiGoreTimer = 15000;
+            uiGrievousWoundTimer = 20000;
+        }
+
         uint32 uiStompTimer;
         uint32 uiGoreTimer;
         uint32 uiGrievousWoundTimer;
@@ -492,9 +517,7 @@ public:
 
         void Reset() override
         {
-            uiStompTimer = 10000;
-            uiGoreTimer = 15000;
-            uiGrievousWoundTimer = 20000;
+            Initialize();
 
             me->GetMotionMaster()->MoveTargetedHome();
 
@@ -596,9 +619,17 @@ public:
     {
         npc_massive_jormungarAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiAcidSpitTimer = 3000;
+            uiAcidSplatterTimer = 12000;
+            uiPoisonBreathTimer = 10000;
+        }
+
         uint32 uiAcidSpitTimer;
         uint32 uiAcidSplatterTimer;
         uint32 uiPoisonBreathTimer;
@@ -607,9 +638,7 @@ public:
 
         void Reset() override
         {
-            uiAcidSpitTimer = 3000;
-            uiAcidSplatterTimer = 12000;
-            uiPoisonBreathTimer = 10000;
+            Initialize();
 
             me->GetMotionMaster()->MoveTargetedHome();
 
@@ -697,17 +726,23 @@ public:
     {
         npc_palehoof_orbAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            currentPhase = PHASE_NONE;
+            SummonTimer = 5000;
+        }
+
         InstanceScript* instance;
         uint32 SummonTimer;
         Phase currentPhase;
 
         void Reset() override
         {
-            currentPhase = PHASE_NONE;
-            SummonTimer = 5000;
+            Initialize();
             //! HACK: Creature's can't have MOVEMENTFLAG_FLYING
             me->AddUnitMovementFlag(MOVEMENTFLAG_FLYING);
             me->RemoveAurasDueToSpell(SPELL_ORB_VISUAL);
diff --git a/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_skadi.cpp b/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_skadi.cpp
index ea44d76e7e6..af5dc4a4e03 100644
--- a/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_skadi.cpp
+++ b/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_skadi.cpp
@@ -169,8 +169,24 @@ public:
     {
         boss_skadiAI(Creature* creature) : ScriptedAI(creature), Summons(me)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
             m_uiGraufGUID = 0;
+            m_uiMovementTimer = 0;
+            m_uiSummonTimer = 0;
+        }
+
+        void Initialize()
+        {
+            m_uiCrushTimer = 8000;
+            m_uiPoisonedSpearTimer = 10000;
+            m_uiWhirlwindTimer = 20000;
+            m_uiMountTimer = 3000;
+            m_uiWaypointId = 0;
+            m_bSaidEmote = false;
+            m_uiSpellHitCount = 0;
+
+            Phase = SKADI;
         }
 
         InstanceScript* instance;
@@ -194,15 +210,7 @@ public:
         {
             triggersGUID.clear();
 
-            m_uiCrushTimer = 8000;
-            m_uiPoisonedSpearTimer = 10000;
-            m_uiWhirlwindTimer = 20000;
-            m_uiMountTimer = 3000;
-            m_uiWaypointId = 0;
-            m_bSaidEmote = false;
-            m_uiSpellHitCount = 0;
-
-            Phase = SKADI;
+            Initialize();
 
             Summons.DespawnAll();
             me->SetSpeed(MOVE_FLIGHT, 3.0f);
diff --git a/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_svala.cpp b/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_svala.cpp
index 621ef20e7e4..6ace4eb61a1 100644
--- a/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_svala.cpp
+++ b/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_svala.cpp
@@ -137,13 +137,20 @@ class boss_svala : public CreatureScript
         {
             boss_svalaAI(Creature* creature) : BossAI(creature, DATA_SVALA_SORROWGRAVE)
             {
+                Initialize();
                 _introCompleted = false;
             }
 
+            void Initialize()
+            {
+                _arthasGUID = 0;
+                _sacrificed = false;
+            }
+
             void Reset() override
             {
                 _Reset();
-                _sacrificed = false;
+                
                 SetCombatMovement(true);
 
                 if (_introCompleted)
@@ -153,7 +160,7 @@ class boss_svala : public CreatureScript
 
                 me->SetDisableGravity(events.IsInPhase(NORMAL));
 
-                _arthasGUID = 0;
+                Initialize();
 
                 instance->SetData64(DATA_SACRIFICED_PLAYER, 0);
             }
@@ -398,17 +405,23 @@ class npc_ritual_channeler : public CreatureScript
         {
             npc_ritual_channelerAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = creature->GetInstanceScript();
 
                 SetCombatMovement(false);
             }
 
+            void Initialize()
+            {
+                paralyzeTimer = 1600;
+            }
+
             InstanceScript* instance;
             uint32 paralyzeTimer;
 
             void Reset() override
             {
-                paralyzeTimer = 1600;
+                Initialize();
 
                 if (IsHeroic())
                     DoCast(me, SPELL_SHADOWS_IN_THE_DARK);
@@ -514,16 +527,24 @@ class npc_scourge_hulk : public CreatureScript
 
         struct npc_scourge_hulkAI : public ScriptedAI
         {
-            npc_scourge_hulkAI(Creature* creature) : ScriptedAI(creature) { }
+            npc_scourge_hulkAI(Creature* creature) : ScriptedAI(creature)
+            {
+                Initialize();
+            }
+
+            void Initialize()
+            {
+                mightyBlow = urand(4000, 9000);
+                volatileInfection = urand(10000, 14000);
+                killedByRitualStrike = false;
+            }
 
             uint32 mightyBlow;
             uint32 volatileInfection;
 
             void Reset() override
             {
-                mightyBlow = urand(4000, 9000);
-                volatileInfection = urand(10000, 14000);
-                killedByRitualStrike = false;
+                Initialize();
             }
 
             uint32 GetData(uint32 type) const override
diff --git a/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_ymiron.cpp b/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_ymiron.cpp
index 01e09ca2f9a..60b898e1786 100644
--- a/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_ymiron.cpp
+++ b/src/server/scripts/Northrend/UtgardeKeep/UtgardePinnacle/boss_ymiron.cpp
@@ -102,6 +102,7 @@ public:
     {
         boss_ymironAI(Creature* creature) : BossAI(creature, DATA_KING_YMIRON)
         {
+            Initialize();
             for (int i = 0; i < 4; ++i)
                 m_uiActiveOrder[i] = i;
             for (int i = 0; i < 3; ++i)
@@ -113,6 +114,35 @@ public:
             }
         }
 
+        void Initialize()
+        {
+            m_bIsWalking = false;
+            m_bIsPause = false;
+            m_bIsActiveWithBJORN = false;
+            m_bIsActiveWithHALDOR = false;
+            m_bIsActiveWithRANULF = false;
+            m_bIsActiveWithTORGYN = false;
+            kingsBane = true;
+
+            m_uiFetidRot_Timer = urand(8000, 13000);
+            m_uiBane_Timer = urand(18000, 23000);
+            m_uiDarkSlash_Timer = urand(28000, 33000);
+            m_uiAncestors_Vengeance_Timer = DUNGEON_MODE(60000, 45000);
+            m_uiPause_Timer = 0;
+
+            m_uiAbility_BJORN_Timer = 0;
+            m_uiAbility_HALDOR_Timer = 0;
+            m_uiAbility_RANULF_Timer = 0;
+            m_uiAbility_TORGYN_Timer = 0;
+
+            m_uiActivedNumber = 0;
+            m_uiHealthAmountModifier = 1;
+            m_uiHealthAmountMultipler = DUNGEON_MODE(20, 25);
+
+            m_uiActivedCreatureGUID = 0;
+            m_uiOrbGUID = 0;
+        }
+
         bool m_bIsWalking;
         bool m_bIsPause;
         bool m_bIsActiveWithBJORN;
@@ -144,31 +174,7 @@ public:
         void Reset() override
         {
             _Reset();
-            m_bIsWalking = false;
-            m_bIsPause = false;
-            m_bIsActiveWithBJORN = false;
-            m_bIsActiveWithHALDOR = false;
-            m_bIsActiveWithRANULF = false;
-            m_bIsActiveWithTORGYN = false;
-            kingsBane = true;
-
-            m_uiFetidRot_Timer            = urand(8000, 13000);
-            m_uiBane_Timer                = urand(18000, 23000);
-            m_uiDarkSlash_Timer           = urand(28000, 33000);
-            m_uiAncestors_Vengeance_Timer = DUNGEON_MODE(60000, 45000);
-            m_uiPause_Timer               = 0;
-
-            m_uiAbility_BJORN_Timer  = 0;
-            m_uiAbility_HALDOR_Timer = 0;
-            m_uiAbility_RANULF_Timer = 0;
-            m_uiAbility_TORGYN_Timer = 0;
-
-            m_uiActivedNumber        = 0;
-            m_uiHealthAmountModifier = 1;
-            m_uiHealthAmountMultipler = DUNGEON_MODE(20, 25);
-
-            m_uiActivedCreatureGUID = 0;
-            m_uiOrbGUID = 0;
+            Initialize();
         }
 
         void EnterCombat(Unit* /*who*/) override
diff --git a/src/server/scripts/Northrend/VaultOfArchavon/boss_emalon.cpp b/src/server/scripts/Northrend/VaultOfArchavon/boss_emalon.cpp
index ea5c5b9ee48..8a88abb9d06 100644
--- a/src/server/scripts/Northrend/VaultOfArchavon/boss_emalon.cpp
+++ b/src/server/scripts/Northrend/VaultOfArchavon/boss_emalon.cpp
@@ -184,13 +184,19 @@ class npc_tempest_minion : public CreatureScript
         {
             npc_tempest_minionAI(Creature* creature) : ScriptedAI(creature)
             {
+                Initialize();
                 instance = creature->GetInstanceScript();
             }
 
+            void Initialize()
+            {
+                OverchargedTimer = 0;
+            }
+
             void Reset() override
             {
                 events.Reset();
-                OverchargedTimer = 0;
+                Initialize();
             }
 
             void JustDied(Unit* /*killer*/) override
diff --git a/src/server/scripts/Northrend/VaultOfArchavon/boss_toravon.cpp b/src/server/scripts/Northrend/VaultOfArchavon/boss_toravon.cpp
index caba44a7100..36c952d14a1 100644
--- a/src/server/scripts/Northrend/VaultOfArchavon/boss_toravon.cpp
+++ b/src/server/scripts/Northrend/VaultOfArchavon/boss_toravon.cpp
@@ -185,14 +185,20 @@ public:
     {
         npc_frozen_orbAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
         }
 
-        void Reset() override
+        void Initialize()
         {
             done = false;
             killTimer = 60000; // if after this time there is no victim -> destroy!
         }
 
+        void Reset() override
+        {
+            Initialize();
+        }
+
         void EnterCombat(Unit* /*who*/) override
         {
             DoZoneInCombat();
diff --git a/src/server/scripts/Northrend/VioletHold/boss_cyanigosa.cpp b/src/server/scripts/Northrend/VioletHold/boss_cyanigosa.cpp
index cca2b347af7..5857f695023 100644
--- a/src/server/scripts/Northrend/VioletHold/boss_cyanigosa.cpp
+++ b/src/server/scripts/Northrend/VioletHold/boss_cyanigosa.cpp
@@ -57,9 +57,19 @@ public:
     {
         boss_cyanigosaAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiArcaneVacuumTimer = 10000;
+            uiBlizzardTimer = 15000;
+            uiManaDestructionTimer = 30000;
+            uiTailSweepTimer = 20000;
+            uiUncontrollableEnergyTimer = 25000;
+        }
+
         uint32 uiArcaneVacuumTimer;
         uint32 uiBlizzardTimer;
         uint32 uiManaDestructionTimer;
@@ -70,11 +80,7 @@ public:
 
         void Reset() override
         {
-            uiArcaneVacuumTimer = 10000;
-            uiBlizzardTimer = 15000;
-            uiManaDestructionTimer = 30000;
-            uiTailSweepTimer = 20000;
-            uiUncontrollableEnergyTimer = 25000;
+            Initialize();
             instance->SetData(DATA_CYANIGOSA_EVENT, NOT_STARTED);
         }
 
diff --git a/src/server/scripts/Northrend/VioletHold/boss_erekem.cpp b/src/server/scripts/Northrend/VioletHold/boss_erekem.cpp
index b63709b34c8..6cc90bcd4ed 100644
--- a/src/server/scripts/Northrend/VioletHold/boss_erekem.cpp
+++ b/src/server/scripts/Northrend/VioletHold/boss_erekem.cpp
@@ -56,9 +56,19 @@ public:
     {
         boss_erekemAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiBloodlustTimer = 15000;
+            uiChainHealTimer = 0;
+            uiEarthShockTimer = urand(2000, 8000);
+            uiLightningBoltTimer = urand(5000, 10000);
+            uiEarthShieldTimer = 20000;
+        }
+
         uint32 uiBloodlustTimer;
         uint32 uiChainHealTimer;
         uint32 uiEarthShockTimer;
@@ -69,11 +79,7 @@ public:
 
         void Reset() override
         {
-            uiBloodlustTimer = 15000;
-            uiChainHealTimer = 0;
-            uiEarthShockTimer = urand(2000, 8000);
-            uiLightningBoltTimer = urand(5000, 10000);
-            uiEarthShieldTimer = 20000;
+            Initialize();
             if (instance->GetData(DATA_WAVE_COUNT) == 6)
                 instance->SetData(DATA_1ST_BOSS_EVENT, NOT_STARTED);
             else if (instance->GetData(DATA_WAVE_COUNT) == 12)
@@ -264,9 +270,17 @@ public:
     {
         npc_erekem_guardAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiStrikeTimer = urand(4000, 8000);
+            uiHowlingScreechTimer = urand(8000, 13000);
+            uiGushingWoundTimer = urand(1000, 3000);
+        }
+
         uint32 uiGushingWoundTimer;
         uint32 uiHowlingScreechTimer;
         uint32 uiStrikeTimer;
@@ -275,9 +289,7 @@ public:
 
         void Reset() override
         {
-            uiStrikeTimer = urand(4000, 8000);
-            uiHowlingScreechTimer = urand(8000, 13000);
-            uiGushingWoundTimer = urand(1000, 3000);
+            Initialize();
         }
 
         void AttackStart(Unit* who) override
diff --git a/src/server/scripts/Northrend/VioletHold/boss_ichoron.cpp b/src/server/scripts/Northrend/VioletHold/boss_ichoron.cpp
index 4aede5e5f46..ba72f6f52ca 100644
--- a/src/server/scripts/Northrend/VioletHold/boss_ichoron.cpp
+++ b/src/server/scripts/Northrend/VioletHold/boss_ichoron.cpp
@@ -85,9 +85,19 @@ public:
     {
         boss_ichoronAI(Creature* creature) : ScriptedAI(creature), m_waterElements(creature)
         {
+            Initialize();
             instance  = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            bIsExploded = false;
+            bIsFrenzy = false;
+            dehydration = true;
+            uiBubbleCheckerTimer = 1000;
+            uiWaterBoltVolleyTimer = urand(10000, 15000);
+        }
+
         bool bIsExploded;
         bool bIsFrenzy;
         bool dehydration;
@@ -101,11 +111,7 @@ public:
 
         void Reset() override
         {
-            bIsExploded = false;
-            bIsFrenzy = false;
-            dehydration = true;
-            uiBubbleCheckerTimer = 1000;
-            uiWaterBoltVolleyTimer = urand(10000, 15000);
+            Initialize();
 
             me->SetVisible(true);
             DespawnWaterElements();
@@ -340,16 +346,22 @@ public:
     {
         npc_ichor_globuleAI(Creature* creature) : ScriptedAI(creature)
         {
+            Initialize();
             instance = creature->GetInstanceScript();
         }
 
+        void Initialize()
+        {
+            uiRangeCheck_Timer = 1000;
+        }
+
         InstanceScript* instance;
 
         uint32 uiRangeCheck_Timer;
 
         void Reset() override
         {
-            uiRangeCheck_Timer = 1000;
+            Initialize();
             DoCast(me, SPELL_WATER_GLOBULE);
         }