fix(Scripts/HoL): Ionar's Static Overload missing knockback (#22049)

data/sql/updates/pending_db_world/rev_1746345420196375200.sql

@@ -0,0 +1,9 @@
+-- HoL - Static Overload
+DELETE FROM `spell_script_names` WHERE `spell_id` IN (52658,59795) AND `ScriptName`='spell_ionar_static_overload';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(52658, 'spell_ionar_static_overload'),
+(59795, 'spell_ionar_static_overload');
+
+DELETE FROM `spelldifficulty_dbc` WHERE `ID` = 53337;
+INSERT INTO `spelldifficulty_dbc` (`ID`, `DifficultySpellID_1`, `DifficultySpellID_2`, `DifficultySpellID_3`, `DifficultySpellID_4`) VALUES
+(53337, 53337, 59798, 0, 0);

src/server/scripts/Northrend/Ulduar/HallsOfLightning/boss_ionar.cpp

@@ -18,6 +18,8 @@
 #include "CreatureScript.h"
 #include "Player.h"
 #include "ScriptedCreature.h"
+#include "SpellScript.h"
+#include "SpellScriptLoader.h"
 #include "SpellInfo.h"
 #include "halls_of_lightning.h"
 
@@ -27,6 +29,7 @@ enum IonarSpells
     SPELL_BALL_LIGHTNING_H          = 59800,
     SPELL_STATIC_OVERLOAD_N         = 52658,
     SPELL_STATIC_OVERLOAD_H         = 59795,
+    SPELL_STATIC_OVERLOAD_KNOCK     = 53337,
 
     SPELL_DISPERSE                  = 52770,
     SPELL_SUMMON_SPARK              = 52746,
@@ -272,8 +275,34 @@ public:
     };
 };
 
+// 52658, 59795 - Static Overload
+class spell_ionar_static_overload : public AuraScript
+{
+    PrepareAuraScript(spell_ionar_static_overload);
+
+    bool Validate(SpellInfo const* /*spellInfo*/) override
+    {
+        return ValidateSpellInfo({ SPELL_STATIC_OVERLOAD_KNOCK });
+    }
+
+    void OnRemove(AuraEffect const* /*aurEff*/, AuraEffectHandleModes /*mode*/)
+    {
+        if (GetTargetApplication()->GetRemoveMode() != AURA_REMOVE_BY_EXPIRE)
+            return;
+
+        if (Unit* target = GetTarget())
+            target->CastSpell(target, SPELL_STATIC_OVERLOAD_KNOCK, true);
+    }
+
+    void Register() override
+    {
+        OnEffectRemove += AuraEffectRemoveFn(spell_ionar_static_overload::OnRemove, EFFECT_0, SPELL_AURA_PERIODIC_TRIGGER_SPELL, AURA_EFFECT_HANDLE_REAL);
+    }
+};
+
 void AddSC_boss_ionar()
 {
     new boss_ionar();
     new npc_spark_of_ionar();
+    RegisterSpellScript(spell_ionar_static_overload);
 }