Core/Scripts: implement Moss Covered Feet

Closes #19022

src/server/scripts/Spells/spell_generic.cpp

@@ -2014,6 +2014,47 @@ class spell_gen_mounted_charge: public SpellScriptLoader
         }
 };
 
+enum MossCoveredFeet
+{
+    SPELL_FALL_DOWN = 6869
+};
+
+// 6870 Moss Covered Feet
+// 31399 Moss Covered Feet
+class spell_gen_moss_covered_feet : public SpellScriptLoader
+{
+    public:
+        spell_gen_moss_covered_feet() : SpellScriptLoader("spell_gen_moss_covered_feet") { }
+
+        class spell_gen_moss_covered_feet_AuraScript : public AuraScript
+        {
+            PrepareAuraScript(spell_gen_moss_covered_feet_AuraScript);
+
+            bool Validate(SpellInfo const* /*spellInfo*/) override
+            {
+                if (!sSpellMgr->GetSpellInfo(SPELL_FALL_DOWN))
+                    return false;
+                return true;
+            }
+
+            void HandleProc(AuraEffect const* aurEff, ProcEventInfo& eventInfo)
+            {
+                PreventDefaultAction();
+                eventInfo.GetActionTarget()->CastSpell((Unit*)nullptr, SPELL_FALL_DOWN, true, nullptr, aurEff);
+            }
+
+            void Register() override
+            {
+                OnEffectProc += AuraEffectProcFn(spell_gen_moss_covered_feet_AuraScript::HandleProc, EFFECT_0, SPELL_AURA_DUMMY);
+            }
+        };
+
+        AuraScript* GetAuraScript() const override
+        {
+            return new spell_gen_moss_covered_feet_AuraScript();
+        }
+};
+
 enum Netherbloom
 {
     SPELL_NETHERBLOOM_POLLEN_1      = 28703
@@ -4304,6 +4345,7 @@ void AddSC_generic_spell_scripts()
     new spell_gen_lifebloom("spell_twisted_visage_lifebloom", SPELL_TWISTED_VISAGE_LIFEBLOOM_FINAL_HEAL);
     new spell_gen_lifebloom("spell_faction_champion_dru_lifebloom", SPELL_FACTION_CHAMPIONS_DRU_LIFEBLOOM_FINAL_HEAL);
     new spell_gen_mounted_charge();
+    new spell_gen_moss_covered_feet();
     new spell_gen_netherbloom();
     new spell_gen_obsidian_armor();
     new spell_gen_on_tournament_mount();