fix(Scripts/Underbog): Fixed Fungal Decay spells. (#14543)

Fixes #13977

data/sql/updates/pending_db_world/rev_1673095047755497100.sql

@@ -0,0 +1,4 @@
+--
+DELETE FROM `spell_script_names` WHERE `spell_id`=32065;
+INSERT INTO `spell_script_names` VALUES
+(32065,'spell_fungal_decay');

src/server/scripts/Outland/CoilfangReservoir/underbog/underbog.cpp

@@ -0,0 +1,46 @@
+/*
+ * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by the
+ * Free Software Foundation; either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ScriptMgr.h"
+#include "SpellScript.h"
+#include "the_underbog.h"
+
+class spell_fungal_decay : public AuraScript
+{
+    PrepareAuraScript(spell_fungal_decay);
+
+    void OnApply(AuraEffect const* /*aurEff*/, AuraEffectHandleModes /*mode*/)
+    {
+        ModStackAmount(5);
+    }
+
+    void PeriodicTick(AuraEffect const* /*aurEff*/)
+    {
+        ModStackAmount(-1);
+    }
+
+    void Register() override
+    {
+        OnEffectApply += AuraEffectApplyFn(spell_fungal_decay::OnApply, EFFECT_1, SPELL_AURA_PERIODIC_DAMAGE, AURA_EFFECT_HANDLE_REAL);
+        OnEffectPeriodic += AuraEffectPeriodicFn(spell_fungal_decay::PeriodicTick, EFFECT_1, SPELL_AURA_PERIODIC_DAMAGE);
+    }
+};
+
+void AddSC_underbog()
+{
+    RegisterSpellScript(spell_fungal_decay);
+}

src/server/scripts/Outland/outland_script_loader.cpp

@@ -50,7 +50,8 @@ void AddSC_boss_hydromancer_thespia();       //CR Steam Vault
 void AddSC_boss_mekgineer_steamrigger();
 void AddSC_boss_warlord_kalithresh();
 void AddSC_instance_steam_vault();
-void AddSC_boss_hungarfen();                 //CR Underbog
+void AddSC_underbog();                       //CR Underbog
+void AddSC_boss_hungarfen();
 void AddSC_boss_ghazan();
 void AddSC_boss_the_black_stalker();
 void AddSC_instance_the_underbog();
@@ -145,7 +146,8 @@ void AddOutlandScripts()
     AddSC_boss_mekgineer_steamrigger();
     AddSC_boss_warlord_kalithresh();
     AddSC_instance_steam_vault();
-    AddSC_boss_hungarfen();                 //CR Underbog
+    AddSC_underbog();                       //CR Underbog
+    AddSC_boss_hungarfen();
     AddSC_boss_ghazan();
     AddSC_boss_the_black_stalker();
     AddSC_instance_the_underbog();