The Vourdalak -

The term "Vourdalak" is derived from the Greek word "vrykolakas" (βρικόλακας), which is used to describe a type of undead creature that rises from the grave to prey on the living. The word is also related to the Bulgarian term "vurdalak" and the Serbian "vurdulak," all of which refer to a similar creature. The origins of the legend are shrouded in mystery, but it is believed to have roots in ancient pagan mythology and the Christian tradition of the undead.