feat(Core/Spells): Allow modifying MiscValues during cast (#20731)

src/server/game/Spells/Spell.cpp

@@ -556,7 +556,11 @@ void SpellCastTargets::OutDebug() const
 SpellValue::SpellValue(SpellInfo const* proto)
 {
     for (uint32 i = 0; i < MAX_SPELL_EFFECTS; ++i)
+    {
         EffectBasePoints[i] = proto->Effects[i].BasePoints;
+        MiscVal[i] = 0;
+    }
+
     MaxAffectedTargets = proto->MaxAffectedTargets;
     RadiusMod = 1.0f;
     AuraStackAmount = 1;
@@ -8458,6 +8462,15 @@ void Spell::SetSpellValue(SpellValueMod mod, int32 value)
         case SPELLVALUE_FORCED_CRIT_RESULT:
             m_spellValue->ForcedCritResult = (bool)value;
             break;
+        case SPELLVALUE_MISCVALUE0:
+            m_spellValue->MiscVal[0] = value;
+            break;
+        case SPELLVALUE_MISCVALUE1:
+            m_spellValue->MiscVal[1] = value;
+            break;
+        case SPELLVALUE_MISCVALUE2:
+            m_spellValue->MiscVal[2] = value;
+            break;
     }
 }
 

src/server/game/Spells/Spell.h

@@ -218,6 +218,7 @@ struct SpellValue
     uint8     AuraStackAmount;
     int32     AuraDuration;
     bool      ForcedCritResult;
+    uint32    MiscVal[MAX_SPELL_EFFECTS];
 };
 
 enum SpellState

src/server/game/Spells/SpellDefines.h

@@ -117,7 +117,10 @@ enum SpellValueMod
     SPELLVALUE_MAX_TARGETS,
     SPELLVALUE_AURA_STACK,
     SPELLVALUE_AURA_DURATION,
-    SPELLVALUE_FORCED_CRIT_RESULT
+    SPELLVALUE_FORCED_CRIT_RESULT,
+    SPELLVALUE_MISCVALUE0,
+    SPELLVALUE_MISCVALUE1,
+    SPELLVALUE_MISCVALUE2,
 };
 
 enum SpellFacingFlags

src/server/game/Spells/SpellEffects.cpp

@@ -2332,6 +2332,10 @@ void Spell::EffectSummonType(SpellEffIndex effIndex)
         return;
 
     uint32 entry = m_spellInfo->Effects[effIndex].MiscValue;
+
+    if (m_spellValue->MiscVal[effIndex])
+        entry = m_spellValue->MiscVal[effIndex];
+
     if (!entry)
         return;