Koshchei
Koshchei, also known as Koshchei the Deathless or Koshchei the Immortal, is a prominent male antagonist in Slavic folklore, particularly in Russian fairy tales. He is a powerful sorcerer and a tyrannical ruler, often depicted as an old, withered man with a skeletal physique. His defining characteristic is his immortality, which is not absolute but rather tied to a cleverly hidden soul or life force.
The source of Koshchei's immortality is a common motif in his tales. His soul is typically hidden
Koshchei is frequently portrayed as a villain who kidnaps princesses, most notably Marya Morevna, the princess