Core/Scripts: implemented Fungal Decay & Tail Sting

Port From (https://github.com/TrinityCore/TrinityCore/commit/d36f8bb7547c5ebef067f834c79754c57ff66a34)

Source/Game/Scripting/SpellScript.cs

@@ -1465,7 +1465,7 @@ namespace Game.Scripting
         void RefreshDuration() { m_aura.RefreshDuration(); }
         long GetApplyTime() { return m_aura.GetApplyTime(); }
         public int GetMaxDuration() { return m_aura.GetMaxDuration(); }
-        void SetMaxDuration(int duration) { m_aura.SetMaxDuration(duration); }
+        public void SetMaxDuration(int duration) { m_aura.SetMaxDuration(duration); }
         int CalcMaxDuration() { return m_aura.CalcMaxDuration(); }
         // expired - duration just went to 0
         public bool IsExpired() { return m_aura.IsExpired(); }

Source/Scripts/Spells/Generic.cs

@@ -364,6 +364,12 @@ namespace Scripts.Spells.Generic
         public const uint A_ValiantOfSilvermoon = 13696;
     }
 
+    struct Misc
+    {
+        //FungalDecay
+        public const int AuraDuration = 12600; // found in sniffs, there is no duration entry we can possibly use
+    }
+
     [Script]
     class spell_gen_absorb0_hitlimit1 : AuraScript
     {
@@ -1270,6 +1276,91 @@ namespace Scripts.Spells.Generic
         }
     }
 
+    [Script] // 32065 - Fungal Decay
+    class spell_gen_decay_over_time_fungal_decay_SpellScript : SpellScript
+    {
+        void ModAuraStack()
+        {
+            Aura aur = GetHitAura();
+            if (aur != null)
+                aur.SetStackAmount((byte)GetSpellInfo().StackAmount);
+        }
+
+        public override void Register()
+        {
+            AfterHit.Add(new HitHandler(ModAuraStack));
+        }
+    }
+
+    [Script] // 32065 - Fungal Decay
+    class spell_gen_decay_over_time_fungal_decay_AuraScript : AuraScript
+    {
+        void ModDuration(AuraEffect aurEff, AuraEffectHandleModes mode)
+        {
+            // only on actual reapply, not on stack decay
+            if (GetDuration() == GetMaxDuration())
+            {
+                SetMaxDuration(Misc.AuraDuration);
+                SetDuration(Misc.AuraDuration);
+            }
+        }
+
+        bool CheckProc(ProcEventInfo eventInfo)
+        {
+            return eventInfo.GetSpellInfo() == GetSpellInfo();
+        }
+
+        void Decay(ProcEventInfo eventInfo)
+        {
+            PreventDefaultAction();
+            ModStackAmount(-1);
+        }
+
+        public override void Register()
+        {
+            DoCheckProc.Add(new CheckProcHandler(CheckProc));
+            OnProc.Add(new AuraProcHandler(Decay));
+            OnEffectApply.Add(new EffectApplyHandler(ModDuration, 0, AuraType.ModDecreaseSpeed, AuraEffectHandleModes.RealOrReapplyMask));
+        }
+    }
+
+    [Script] // 36659 - Tail Sting
+    class spell_gen_decay_over_time_tail_sting_SpellScript : SpellScript
+    {
+        void ModAuraStack()
+        {
+            Aura aur = GetHitAura();
+            if (aur != null)
+                aur.SetStackAmount((byte)GetSpellInfo().StackAmount);
+        }
+
+        public override void Register()
+        {
+            AfterHit.Add(new HitHandler(ModAuraStack));
+        }
+    }
+
+    [Script] // 36659 - Tail Sting
+    class spell_gen_decay_over_time_tail_sting_AuraScript : AuraScript
+    {
+        bool CheckProc(ProcEventInfo eventInfo)
+        {
+            return eventInfo.GetSpellInfo() == GetSpellInfo();
+        }
+
+        void Decay(ProcEventInfo eventInfo)
+        {
+            PreventDefaultAction();
+            ModStackAmount(-1);
+        }
+
+        public override void Register()
+        {
+            DoCheckProc.Add(new CheckProcHandler(CheckProc));
+            OnProc.Add(new AuraProcHandler(Decay));
+        }
+    }
+
     [Script]
     class spell_gen_despawn_self : SpellScript
     {

sql/updates/world/master/2021_06_22_02_world_2018_02_16_02_world.sql

@@ -0,0 +1,8 @@
+DELETE FROM `spell_proc` WHERE `SpellId` IN (32065, 36659);
+INSERT INTO `spell_proc` (`SpellId`, `SchoolMask`, `SpellFamilyName`, `SpellFamilyMask0`, `SpellFamilyMask1`, `SpellFamilyMask2`, `ProcFlags`, `SpellTypeMask`, `SpellPhaseMask`, `HitMask`, `AttributesMask`, `ProcsPerMinute`, `Chance`, `Cooldown`, `Charges`) VALUES
+(32065, 0x0, 0, 0x00000000, 0x00000000, 0x00000000, 0x80000, 0x1, 0x0, 0x0, 0x0, 0, 0, 0, 0),
+(36659, 0x0, 0, 0x00000000, 0x00000000, 0x00000000, 0x80000, 0x1, 0x0, 0x0, 0x0, 0, 0, 0, 0);
+DELETE FROM `spell_script_names` WHERE `ScriptName` IN ('spell_gen_decay_over_time_fungal_decay','spell_gen_decay_over_time_tail_sting');
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(32065, 'spell_gen_decay_over_time_fungal_decay'),
+(36659, 'spell_gen_decay_over_time_tail_sting');