Rewrite Golemagg and fix 'Golemagg's Trust' (#2835)

sql/migrations/20241117202208_world.sql

@@ -0,0 +1,24 @@
+DROP PROCEDURE IF EXISTS add_migration;
+DELIMITER ??
+CREATE PROCEDURE `add_migration`()
+BEGIN
+DECLARE v INT DEFAULT 1;
+SET v = (SELECT COUNT(*) FROM `migrations` WHERE `id`='20241117202208');
+IF v = 0 THEN
+INSERT INTO `migrations` VALUES ('20241117202208');
+-- Add your query below.
+
+-- Golemagg - add missing auras
+-- 13879 Magma Splash - Golemagg splashes magma at his attackers, dealing Fire damage over time and reducing their armor. This ability can stack.
+-- 20556 Golemagg's Trust - Golemagg's Core Ragers will deal increased damage and have 50% increased attack speed if tanked too close to Golemagg.
+-- 18943 Double Attack - Proc chance: 50%, 3s cooldown
+UPDATE `creature_template` SET `auras` = "13879 20556 18943" WHERE `entry` = 11988;
+
+DELETE FROM `script_texts` WHERE `entry` = -1409002; -- %s refuses to die while its master is in trouble. (2) -> 7865
+
+-- End of migration.
+END IF;
+END??
+DELIMITER ;
+CALL add_migration();
+DROP PROCEDURE IF EXISTS add_migration;

src/game/Spells/SpellAuras.cpp

@@ -1558,7 +1558,7 @@ void Aura::TriggerSpell()
                 for (auto const& it : pList)
                 {
                     Player* pPlayer = it.getSource();
-                    if (pPlayer->GetGUID() == casterGUID) continue;
+                    if (pPlayer->GetGUID() == casterGUID.GetRawValue()) continue;
                     if (!pPlayer) continue;
                     if (pPlayer->IsDead()) continue;
                     // 2d distance should be good enough
@@ -1826,6 +1826,12 @@ void Aura::HandleAuraDummy(bool apply, bool Real)
                         }
                         return;
                     }
+                    case 20556: // Golemagg's Trust
+                    {
+                            m_isPeriodic = true;
+                            m_modifier.periodictime = 1000;
+                            return;
+                    }
                     case 22646:                             // Goblin Rocket Helmet
                     {
                         if (Unit* caster = GetCaster())
@@ -2062,8 +2068,18 @@ void Aura::HandleAuraDummy(bool apply, bool Real)
             case 23183:                                     // Mark of Frost
             {
                 if (m_removeMode == AURA_REMOVE_BY_DEATH)
-                    target->CastSpell(target, 23182, true, nullptr, this);
-                    return;
+                {
+                    if (Unit* caster = GetCaster())
+                    {
+                        // Azuregos
+                        // TODO verify: Only cast Mark of Frost on targets nearby when engaged?
+                        // if (caster->IsInCombat())
+                        // {
+                            target->CastSpell(target, 23182, true, nullptr, this);
+                        // }
+                    }
+                }
+                return;
             }
             case 28169:                                     // Mutating Injection
             {
@@ -6790,6 +6806,29 @@ void Aura::PeriodicDummyTick()
 
                     return;
                 }
+                case 20556: // Golemagg's Trust
+                {
+                    if (Unit* pCaster = GetCaster())
+                    {
+                        if (pCaster->IsDead() && !pCaster->IsInCombat())
+                        {
+                            return;
+                        }
+                        // Golemagg's Core Ragers will deal increased damage
+                        // and have 50% increased attack speed if tanked too close to Golemagg.
+                        std::list<Creature*> addList;
+                        pCaster->GetCreatureListWithEntryInGrid(addList, 11672, 30.0f);
+                        if (!addList.empty())
+                        {
+                            for (const auto& itr : addList)
+                            {
+                                // Golemagg's Trust Buff
+                                pCaster->CastSpell(itr, 20553, true, nullptr, this);
+                            }
+                        }
+                    }
+                    return;
+                }
             }
             break;
         }