Koshchei
Koshchei (Russian: Коще́й, romanized: Koshchey, IPA: [kɐˈɕːej]), also Kashchei (Russian: Каще́й, romanized: Kashchey, IPA: [kɐˈɕːej]), often given the epithet "the Immortal", or "the Deathless" (Russian: Бессме́ртный), is an archetypal male antagonist in Russian folklore and mythology. The most common feature of tales involving Koshchei is a spell which prevents him from being killed.