Core/Spells: Properly fix Arcane Surge bug

src/server/game/Entities/Unit/Unit.cpp

@@ -5720,7 +5720,7 @@ bool Unit::HandleDummyAuraProc(Unit *pVictim, uint32 damage, AuraEffect* trigger
             // Incanter's Regalia set (add trigger chance to Mana Shield)
             if (dummySpell->SpellFamilyFlags[0] & 0x8000)
             {
-                if (!HasAura(37424))
+                if (GetTypeId() != TYPEID_PLAYER)
                     return false;
 
                 target = this;

src/server/game/Spells/SpellMgr.cpp

@@ -3637,6 +3637,11 @@ void SpellMgr::LoadSpellCustomAttr()
             spellInfo->EffectImplicitTargetA[1] = TARGET_UNIT_TARGET_ENEMY;
             ++count;
             break;
+        case 8494: // Mana Shield (rank 2)
+            // because of bug in dbc
+            spellInfo->procChance = 0;
+            ++count;
+            break;
         case 32182: // Heroism
             spellInfo->excludeCasterAuraSpell = 57723; // Exhaustion
             ++count;