fix(Scripts/ZulAman): Akil'zon storm damage should multiply per tick (#20842)

data/sql/updates/pending_db_world/rev_1733366049086007200.sql

@@ -0,0 +1,4 @@
+--
+DELETE FROM `spell_script_names` WHERE `spell_id` = 43657;
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(43657, 'spell_electrical_storm_proc');

src/server/scripts/EasternKingdoms/ZulAman/boss_akilzon.cpp

@@ -20,6 +20,8 @@
 #include "GridNotifiers.h"
 #include "GridNotifiersImpl.h"
 #include "ScriptedCreature.h"
+#include "SpellAuras.h"
+#include "SpellAuraEffects.h"
 #include "SpellScript.h"
 #include "SpellScriptLoader.h"
 #include "Weather.h"
@@ -321,9 +323,30 @@ class spell_electrial_storm : public AuraScript
     }
 };
 
+// 43657 - Electrical Storm
+class spell_electrical_storm_proc : public SpellScript
+{
+    PrepareSpellScript(spell_electrical_storm_proc);
+
+    void HandleDamageCalc(SpellEffIndex /*effIndex*/)
+    {
+        if (Aura* aura = GetCaster()->GetAura(SPELL_ELECTRICAL_STORM))
+        {
+            uint8 multiplier = aura->GetEffect(EFFECT_1)->GetTickNumber();
+            SetHitDamage(GetHitDamage() * multiplier);
+        }
+    }
+
+    void Register() override
+    {
+        OnEffectHitTarget += SpellEffectFn(spell_electrical_storm_proc::HandleDamageCalc, EFFECT_0, SPELL_EFFECT_SCHOOL_DAMAGE);
+    }
+};
+
 void AddSC_boss_akilzon()
 {
     RegisterZulAmanCreatureAI(boss_akilzon);
     RegisterZulAmanCreatureAI(npc_akilzon_eagle);
     RegisterSpellScript(spell_electrial_storm);
+    RegisterSpellScript(spell_electrical_storm_proc);
 }