fix(Scripts/Ulduar): randomize Thorim lightning pillar (#26054)

data/sql/updates/pending_db_world/rev_1780334902720000000.sql

@@ -0,0 +1,3 @@
+--
+DELETE FROM `spell_script_names` WHERE `spell_id` = 62976 AND `ScriptName` = 'spell_thorim_lightning_pillar_P2';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES (62976, 'spell_thorim_lightning_pillar_P2');

src/server/scripts/Northrend/Ulduar/Ulduar/boss_thorim.cpp

@@ -1592,6 +1592,7 @@ public:
     }
 };
 
+// 63238 Lightning Pillar
 class spell_thorim_lightning_pillar_P2_aura : public AuraScript
 {
     PrepareAuraScript(spell_thorim_lightning_pillar_P2_aura);
@@ -1609,6 +1610,29 @@ class spell_thorim_lightning_pillar_P2_aura : public AuraScript
     }
 };
 
+// 62976 Lightning Pillar
+class spell_thorim_lightning_pillar_P2 : public SpellScript
+{
+    PrepareSpellScript(spell_thorim_lightning_pillar_P2);
+
+    void SelectPillar(WorldObject*& target)
+    {
+        if (Unit* caster = GetCaster())
+        {
+            std::list<Creature*> pillars;
+            caster->GetCreatureListWithEntryInGrid(pillars, NPC_PILLAR, GetSpellInfo()->GetMaxRange());
+
+            if (!pillars.empty())
+                target = Acore::Containers::SelectRandomContainerElement(pillars);
+        }
+    }
+
+    void Register() override
+    {
+        OnObjectTargetSelect += SpellObjectTargetSelectFn(spell_thorim_lightning_pillar_P2::SelectPillar, EFFECT_0, TARGET_UNIT_NEARBY_ENTRY);
+    }
+};
+
 class spell_thorim_trash_impale_aura : public AuraScript
 {
     PrepareAuraScript(spell_thorim_trash_impale_aura);
@@ -1679,6 +1703,7 @@ void AddSC_boss_thorim()
     new go_thorim_lever();
 
     // Spells
+    RegisterSpellScript(spell_thorim_lightning_pillar_P2);
     RegisterSpellScript(spell_thorim_lightning_pillar_P2_aura);
     RegisterSpellScript(spell_thorim_trash_impale_aura);