diff --git a/sql/updates/world/4.3.4/2020_07_12_01_world.sql b/sql/updates/world/4.3.4/2020_07_12_01_world.sql
new file mode 100644
index 00000000000..fbd9debf1f5
--- /dev/null
+++ b/sql/updates/world/4.3.4/2020_07_12_01_world.sql
@@ -0,0 +1,2 @@
+UPDATE `creature_template` SET `ScriptName`= '', `AIName`= '' WHERE `entry`= 42098;
+UPDATE `creature` SET `ScriptName`= 'npc_bot_invisible_stalker_phase_twist' WHERE `guid` IN (253820, 253821, 253808, 253815);
diff --git a/src/server/scripts/EasternKingdoms/BastionOfTwilight/bastion_of_twilight.cpp b/src/server/scripts/EasternKingdoms/BastionOfTwilight/bastion_of_twilight.cpp
index d31705817b2..02c45fe18c9 100644
--- a/src/server/scripts/EasternKingdoms/BastionOfTwilight/bastion_of_twilight.cpp
+++ b/src/server/scripts/EasternKingdoms/BastionOfTwilight/bastion_of_twilight.cpp
@@ -23,9 +23,91 @@
 #include "SpellAuraEffects.h"
 #include "GameObject.h"
 #include "GameObjectAI.h"
+#include "Object.h"
+#include "PassiveAI.h"
 #include "Player.h"
 #include "bastion_of_twilight.h"
 
+#include <vector>
+
+enum PhaseTwist
+{
+    // Events
+    EVENT_REGISTER_TWISTERS = 1,
+    EVENT_CHECK_TWISTERS,
+    EVENT_PHASE_BURN,
+
+    // Spells
+    SPELL_PHASED_BURN = 85799
+};
+
+struct npc_bot_invisible_stalker_phase_twist : public NullCreatureAI
+{
+    npc_bot_invisible_stalker_phase_twist(Creature* creature) : NullCreatureAI(creature) { }
+
+    void JustAppeared() override
+    {
+        _events.ScheduleEvent(EVENT_REGISTER_TWISTERS, 1s);
+    }
+
+    void UpdateAI(uint32 diff) override
+    {
+        _events.Update(diff);
+
+        while (uint32 eventId = _events.ExecuteEvent())
+        {
+            switch (eventId)
+            {
+                case EVENT_REGISTER_TWISTERS:
+                    me->GetCreatureListWithEntryInGrid(_phaseTwisterVector, NPC_TWILIGHT_PHASE_SHIFTER, 10.f);
+                    if (_phaseTwisterVector.empty()) // if the twister have not been added to the grid yet, keep searching
+                        _events.Repeat(1s);
+                    else
+                    {
+                        _events.ScheduleEvent(EVENT_CHECK_TWISTERS, 1s);
+                        _events.ScheduleEvent(EVENT_PHASE_BURN, 1s);
+                    }
+                    break;
+                case EVENT_CHECK_TWISTERS:
+                {
+                    uint8 deadTwisters = 0;
+                    for (Unit const* twister : _phaseTwisterVector)
+                    {
+                        if (!twister || twister->isDead())
+                            ++deadTwisters;
+                    }
+
+                    if (deadTwisters == _phaseTwisterVector.size())
+                    {
+                        _events.Reset();
+                        me->InterruptNonMeleeSpells(true);
+                        me->RemoveAllAuras();
+                        me->DespawnOrUnsummon(4s);
+                    }
+                    else
+                        _events.Repeat(1s);
+                    break;
+                }
+                case EVENT_PHASE_BURN:
+                    if (Unit* target = me->SelectNearestTarget(40.f, true))
+                    {
+                        DoCast(target, SPELL_PHASED_BURN);
+                        _events.Repeat(8s);
+                    }
+                    else
+                        _events.Repeat(1s);
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+
+private:
+    EventMap _events;
+    std::vector<Creature*> _phaseTwisterVector;
+};
+
 class at_theralion_and_valiona_intro : public AreaTriggerScript
 {
     public:
@@ -93,9 +175,10 @@ class at_chogall_intro : public AreaTriggerScript
 
 void AddSC_bastion_of_twilight()
 {
+    RegisterBastionOfTwilightCreatureAI(npc_bot_invisible_stalker_phase_twist);
     new at_theralion_and_valiona_intro();
     new at_ascendant_council_intro_1();
     new at_ascendant_council_intro_2();
     new at_ascendant_council_intro_3();
     new at_chogall_intro();
-}
\ No newline at end of file
+}
diff --git a/src/server/scripts/EasternKingdoms/BastionOfTwilight/bastion_of_twilight.h b/src/server/scripts/EasternKingdoms/BastionOfTwilight/bastion_of_twilight.h
index 8ebff90e117..10de003b81b 100644
--- a/src/server/scripts/EasternKingdoms/BastionOfTwilight/bastion_of_twilight.h
+++ b/src/server/scripts/EasternKingdoms/BastionOfTwilight/bastion_of_twilight.h
@@ -145,7 +145,8 @@ enum BoTCreatures
     NPC_SPIKED_TENTACLE_TRIGGER         = 50265,
 
     // Generic Creatures
-    NPC_INVISIBLE_STALKER               = 42098
+    NPC_INVISIBLE_STALKER               = 42098,
+    NPC_TWILIGHT_PHASE_SHIFTER          = 45267
 };
 
 enum BoTGameObjects