Wurdulac

Wurdulac, also spelled wurdalak, verdilak or vurdulak, is a kind of vampire in the Slavic folklore mythology.

Some Western sources define it as a type of "Russian vampire" that must consume the blood of its loved ones and convert its whole family.

Nowadays the three terms are regarded as synonymous, but in 19th century they were seen as separate, although similar entities.

The Russian upyr was said to be a former witch, werewolf or a particularly nasty sinner who had been excommunicated from the church.

It is the corrupt form of the West Slavic word volkodlak (Russian: волкодлак), meaning literally 'wolf-fur' or 'wolf-hide', denoting someone "wearing" a wolf's skin, a werewolf.