The Tenatz are from Bosnian legends. They are undead shapeshifters. They can turn into mice or other small burrowing creatures to escape from their graves. They return to the form of a walking corpse once above ground. They consume blood. Cutting the hamstrings of a corpse is thought to prevent them from rising as a Tenatz. If they have already risen, they can be stopped with fire or exorcism. Citations: Maberry, Jonathan. Vampire Universe: The Dark World of Supernatural Beings That Haunt Us, Hunt Us, and Hunger for Us. United States, Kensington Publishing Corporation, 2006.