Dedicated to despaircomesknocking because she is awesome.
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Koschei The Deathless

Origin: Slavic mythology

Summary and or explanation: (Trust me when I say that this guy is not someone you would want to battle.) Koschei the Deathless is the classic mythological villain, the guy who goes and steals the hero's wife, tries to woo her but ultimately cannot because he had forgotten he was a kidnapper, a sadist and quite hideous. Since he cannot die, nobody can beat him... right?

Well, there is a single way to kill him: you must destroy his soul.

Unfortunately for you or whatever poor person that tries to take him down, he's hidden his soul away in the form of a needle. And the needle is inside of an egg, which is inside of a duck, which in turn is inside of a hare. The hare itself is hidden inside of an iron box, which is buried under an oak tree, which is on the mythical island of Buyan, home of the three winds. Not exactly a stroll through the park if you ask me. (All I can say is, don't screw with this creature.)