Fext/Kostlivec

Fext are a form of undead from Eastern Bohemia and Western Moravia. Their other name, Kostlivec, simply means “skeleton” which is a less specific term. It is believed that babies with their amniotic sac still around them at birth are likely to become Fext. Their corpses do not decompose after death. Their skin is like a hardened shell, and they cannot be killed with normal bullets but can be killed with a glass ball or peg. Many of them are connected to the thirty years war.

Citations:

Marenčin, Albert, and Stejskal, Martin. Labyrintem tajemna, aneb, Průvodce po magických místech Československa. Czechia, Paseka, 1991.