Forked from https://github.com/ZhengPeiRu21/mod-leech

src/Leech.cpp

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+/*
+ * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
+ */
+
+#include "Leech.h"
+
+class Leech_UnitScript : public UnitScript
+{
+public:
+    Leech_UnitScript() : UnitScript("Leech_UnitScript") { }
+
+    void OnDamage(Unit* attacker, Unit* victim, uint32& damage) override
+    {
+        if (!sConfigMgr->GetOption<bool>("Leech.Enable", true) || !attacker)
+        {
+            return;
+        }
+
+        bool isPet = attacker->GetOwner() && attacker->GetOwner()->GetTypeId() == TYPEID_PLAYER;
+        if (!isPet && attacker->GetTypeId() != TYPEID_PLAYER)
+        {
+            return;
+        }
+        Player* player = isPet ? attacker->GetOwner()->ToPlayer() : attacker->ToPlayer();
+
+        if (sConfigMgr->GetOption<bool>("Leech.DungeonsOnly", true) && !(player->GetMap()->IsDungeon()))
+        {
+            return;
+        }
+
+        auto leechAmount = sConfigMgr->GetOption<float>("Leech.Amount", 0.05f);
+        auto bp1 = static_cast<int32>(leechAmount * float(damage));
+        player->CastCustomSpell(attacker, SPELL_HEAL, &bp1, nullptr, nullptr, true);
+    }
+};
+
+
+// Add all scripts in one
+void AddSC_mod_leech()
+{
+    new Leech_UnitScript();
+}

src/Leech.h

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+
+#ifndef AZEROTHCORE_LEECH_H
+#define AZEROTHCORE_LEECH_H
+#include "ScriptMgr.h"
+#include "Player.h"
+#include "Config.h"
+#include <map>
+
+enum LeechSpells
+{
+    SPELL_HEAL = 18984
+};
+
+
+#endif //AZEROTHCORE_LEECH_H

src/Leech_loader.cpp

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+/*
+ * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
+ */
+
+// From SC
+void AddSC_mod_leech();
+
+// Add all
+// cf. the naming convention https://github.com/azerothcore/azerothcore-wotlk/blob/master/doc/changelog/master.md#how-to-upgrade-4
+// additionally replace all '-' in the module folder name with '_' here
+void Addmod_leechScripts()
+{
+    AddSC_mod_leech();
+}