diff --git a/server/gameserver/skillhelper.cc b/server/gameserver/skillhelper.cc
index 494b6737..f751b2f3 100644
--- a/server/gameserver/skillhelper.cc
+++ b/server/gameserver/skillhelper.cc
@@ -320,7 +320,12 @@ int SkillHelper::GetYmczReserveDistance(const MetaData::Skill* skill_meta)
 
 float SkillHelper::GetYmczDmg(Creature* sender, Creature* target, const MetaData::Skill* skill_meta)
 {
-    return 0;
+    float finaly_dmg =
+        (skill_meta->number_meta->float_ratio +
+         skill_meta->number_meta->float_ratio2 *
+         sender->GetBattleContext()->GetHeroTotalAtk()) *
+        (1 - target->GetBattleContext()->GetDef() / (target->GetBattleContext()->GetDef() + 400));
+    return finaly_dmg;
 }
 
 bool SkillHelper::ProcBulletDmg(Bullet* bullet, Creature* target, float& finaly_dmg)