Core/Auras: Handle SPELL_AURA_MOD_SCHOOL_MASK_DAMAGE_FROM_CASTER

Port From (https://github.com/TrinityCore/TrinityCore/commit/e11067a39861214bde940bdc0e5b11daf7c326a0)

Source/Framework/Constants/Spells/SpellAuraConst.cs

@@ -291,7 +291,7 @@ namespace Framework.Constants
         ModImmuneAuraApplySchool = 267,
         Unk268 = 268,  // Old ModAttackPowerOfStatPercent. Unused 4.3.4
         ModIgnoreTargetResist = 269,
-        ModSchoolMaskDamageFromCaster = 270,  // NYI
+        ModSchoolMaskDamageFromCaster = 270,
         ModSpellDamageFromCaster = 271,
         IgnoreMeleeReset = 272,
         XRay = 273,

Source/Game/Entities/Unit/Unit.Combat.cs

@@ -2910,11 +2910,14 @@ namespace Game.Entities
             if (spellProto != null)
             {
                 // From caster spells
+                TakenTotalMod *= GetTotalAuraMultiplier(AuraType.ModSchoolMaskDamageFromCaster, aurEff =>
+                {
+                    return aurEff.GetCasterGUID() == attacker.GetGUID() && (aurEff.GetMiscValue() & (int)spellProto.GetSchoolMask()) != 0;
+                });
+
                 TakenTotalMod *= GetTotalAuraMultiplier(AuraType.ModSpellDamageFromCaster, aurEff =>
                 {
-                    if (aurEff.GetCasterGUID() == attacker.GetGUID() && aurEff.IsAffectingSpell(spellProto))
+                    return aurEff.GetCasterGUID() == attacker.GetGUID() && aurEff.IsAffectingSpell(spellProto);
-                        return true;
-                    return false;
                 });
 
                 // Mod damage from spell mechanic

Source/Game/Entities/Unit/Unit.Spells.cs

@@ -299,11 +299,14 @@ namespace Game.Entities
                 TakenTotalMod *= GetTotalAuraMultiplierByMiscMask(AuraType.ModDamagePercentTaken, (uint)spellProto.GetSchoolMask());
 
                 // From caster spells
+                TakenTotalMod *= GetTotalAuraMultiplier(AuraType.ModSchoolMaskDamageFromCaster, aurEff =>
+                {
+                    return aurEff.GetCasterGUID() == caster.GetGUID() && (aurEff.GetMiscValue() & (int)spellProto.GetSchoolMask()) != 0;
+                });
+
                 TakenTotalMod *= GetTotalAuraMultiplier(AuraType.ModSpellDamageFromCaster, aurEff =>
                 {
-                    if (aurEff.GetCasterGUID() == caster.GetGUID() && aurEff.IsAffectingSpell(spellProto))
+                    return aurEff.GetCasterGUID() == caster.GetGUID() && aurEff.IsAffectingSpell(spellProto);
-                        return true;
-                    return false;
                 });
 
                 int TakenAdvertisedBenefit = SpellBaseDamageBonusTaken(spellProto.GetSchoolMask());

Source/Game/Spells/Auras/AuraEffect.cs

@@ -649,6 +649,7 @@ namespace Game.Spells
                     if (!eventInfo.GetProcSpell() || eventInfo.GetProcSpell().GetCastTime() == 0)
                         return false;
                     break;
+                case AuraType.ModSchoolMaskDamageFromCaster:
                 case AuraType.ModSpellDamageFromCaster:
                     // Compare casters
                     if (GetCasterGUID() != eventInfo.GetActor().GetGUID())

Source/Game/Spells/SpellManager.cs

@@ -3480,6 +3480,7 @@ namespace Game.Entities
                 case AuraType.ModMeleeHaste3:
                 case AuraType.ModAttackerMeleeHitChance:
                 case AuraType.ProcTriggerSpellWithValue:
+                case AuraType.ModSchoolMaskDamageFromCaster:
                 case AuraType.ModSpellDamageFromCaster:
                 case AuraType.AbilityIgnoreAurastate:
                 case AuraType.ModInvisibility: