The Kashubes of a West Slavic ethnic group of people in Pomerelia, north-central Poland. The Kashubes believed in the Nachzeher, which is a vampire creature that had the ability to kill its relatives by using psychic powers.
It is thought that people born with cauls or teeth were most likely to become a vampire.
The Nachzeher would devour its shroud and pieces of its own flesh when in its grave. By doing this, the vampire was able to cause its living relatives to waste away and die.