fix(Script/Item): Elixir of Shadows for pets (#14514)

* closes https://github.com/azerothcore/azerothcore-wotlk/issues/13067

data/sql/updates/pending_db_world/rev_1672970116654820600.sql

@@ -0,0 +1,4 @@
+--
+DELETE FROM `spell_script_names` WHERE `spell_id`=37678 AND `ScriptName`='spell_item_elixir_of_shadows';
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(37678, 'spell_item_elixir_of_shadows');

src/server/scripts/Spells/spell_item.cpp

@@ -25,6 +25,7 @@
 #include "GameTime.h"
 #include "ObjectMgr.h"
 #include "Player.h"
+#include "Pet.h"
 #include "ScriptMgr.h"
 #include "ScriptedCreature.h"
 #include "SkillDiscovery.h"
@@ -3758,6 +3759,26 @@ class spell_item_green_whelp_armor : public AuraScript
     }
 };
 
+// 37678 - elixir of shadows
+/// @todo Temporary fix until pet restrictions vs player restrictions are investigated
+class spell_item_elixir_of_shadows : public SpellScript
+{
+    PrepareSpellScript(spell_item_elixir_of_shadows);
+
+    void HandleEffect(SpellEffIndex /*effIndex*/)
+    {
+        if (Player* player = GetCaster()->ToPlayer())
+            if (Pet* pet = player->GetPet())
+                pet->AddAura(37678 /*Elixir of Shadows*/, pet);
+    }
+
+    void Register() override
+    {
+        OnEffectHitTarget += SpellEffectFn(spell_item_elixir_of_shadows::HandleEffect, EFFECT_0, SPELL_EFFECT_APPLY_AURA);
+        OnEffectHitTarget += SpellEffectFn(spell_item_elixir_of_shadows::HandleEffect, EFFECT_1, SPELL_EFFECT_APPLY_AURA);
+    }
+};
+
 enum TrollDice
 {
     TEXT_WORN_TROLL_DICE = 26152
@@ -3914,5 +3935,6 @@ void AddSC_item_spell_scripts()
     RegisterSpellScript(spell_item_snowman);
     RegisterSpellScript(spell_item_freeze_rookery_egg);
     RegisterSpellScript(spell_item_green_whelp_armor);
+    RegisterSpellScript(spell_item_elixir_of_shadows);
     RegisterSpellScript(spell_item_worn_troll_dice);
 }