soucouyant

In folklore from various islands of the Carribbean, The soucouyant is a kind of witch-vampire that lives by day as an old woman at the end of the village. By night, however, she strips off her wrinkled skin, puts it in a mortar, and flies in the shape of a fireball through the darkness, looking for a victim. Still in the shape of a fireball, she enters the home of her victim through the keyhole or any crack or crevice.

Soucouyants suck the blood of people from their arms, legs and other soft parts while they sleep. If she draws out too much blood from her victim, it is believed that the victim will die and become a soucouyant herself, or else perish entirely, leaving her killer to assume her skin.