Koshchei

In Russian mythology, especially in the Caucasus region, Koshchei is an evil spirit with a terrible appearance, menacing principally young women. Koschei's another name is Koschei-Immortal the reason for that is the fact that his death is saved separately in needle, that is in egg, that is in box, that is on the big tree. Koschei will die the day the needle is broken.

In Neil Gaimans American Gods Koschei is referenced as an evil wizard.

Robert Heinleins Job: a comedy of justice Koschei is the supreme glaroon who presides over Jehovah and Loki.