Wurdalak

The Wurdalak is from Russian folklore. They are heretics or blasphemers who rise from the grave after making a deal with the devil for immortality. Their hunger is insatiable and consumes its immortal life. They often look like a female who appears young and attractive to lure in victims. They return to the form of rotting corpses when alone with their victims which is their true form.

Citations:

Maberry, Jonathan. Vampire Universe: The Dark World of Supernatural Beings That Haunt Us, Hunt Us, and Hunger for Us. United States, Kensington Publishing Corporation, 2006.