Core/Spells: Added spell value duration to modify aura duration of a specific spell cast

src/server/game/Spells/Spell.cpp

@@ -503,6 +503,7 @@ SpellValue::SpellValue(SpellInfo const* proto, Unit const* caster)
     MaxAffectedTargets = proto->MaxAffectedTargets;
     RadiusMod = 1.0f;
     AuraStackAmount = 1;
+    DurationMul = 1;
 }
 
 class TC_GAME_API SpellEvent : public BasicEvent
@@ -2717,6 +2718,8 @@ SpellMissInfo Spell::DoSpellHitOnUnit(Unit* unit, uint32 effectMask)
 
                     if (duration > 0)
                     {
+                        duration *= m_spellValue->DurationMul;
+
                         // Haste modifies duration of channeled spells
                         if (m_spellInfo->IsChanneled())
                             m_originalCaster->ModSpellDurationTime(m_spellInfo, duration, this);
@@ -3433,6 +3436,8 @@ void Spell::handle_immediate()
             if (Player* modOwner = m_caster->GetSpellModOwner())
                 modOwner->ApplySpellMod(m_spellInfo, SpellModOp::Duration, duration);
 
+            duration *= m_spellValue->DurationMul;
+
             // Apply haste mods
             m_caster->ModSpellDurationTime(m_spellInfo, duration, this);
 
@@ -7555,6 +7560,9 @@ void Spell::SetSpellValue(SpellValueMod mod, int32 value)
         case SPELLVALUE_AURA_STACK:
             m_spellValue->AuraStackAmount = uint8(value);
             break;
+        case SPELLVALUE_DURATION_PCT:
+            m_spellValue->DurationMul = float(value) / 100.0f;
+            break;
         default:
             break;
     }

src/server/game/Spells/Spell.h

@@ -305,6 +305,7 @@ struct SpellValue
     uint32    MaxAffectedTargets;
     float     RadiusMod;
     int32     AuraStackAmount;
+    float     DurationMul;
 };
 
 enum SpellState

src/server/game/Spells/SpellDefines.h

@@ -211,7 +211,8 @@ enum SpellValueMod : uint8
     SPELLVALUE_BASE_POINT_END,
     SPELLVALUE_RADIUS_MOD,
     SPELLVALUE_MAX_TARGETS,
-    SPELLVALUE_AURA_STACK
+    SPELLVALUE_AURA_STACK,
+    SPELLVALUE_DURATION_PCT
 };
 
 enum SpellFacingFlags