Empusae

Female demons. The Empusae were the Greek version of vampires or Succubi. The Empusae were either the retinue or the offspring of the goddess Hecate. Each Empusa had one leg of a donkey, while the other leg was made of brass. I could only find a description of the Empusa in Aristophanes' comedies, Frogs and Assembly Women.

In the dialogue of Dionysus and Xanthias in the Frogs, they talked about how an Empusa had the ability to shift-change into a bull, a mule, a dog, or a girl. Usually they preferred to change themselves into beautiful maidens so they could lure young men to their beds. Once an Empusa had her victim at her mercy, she would drink the blood of the young man until he died. They could be easily frightened off if you loudly swore at her.