A Shroud-eater is the common English name for the Germanic Nachzehrer and Latin De Masticatione Mortuorum.
Unlike modern notions of vampires, shroud-eaters do not consume blood but rather the life-force of victims by consuming their grave shrouds, nearby buried corpses, and even their own bodies.
Shroud-eaters are commonly associated with plagues. The first victim of a plague was generally believed to be the vampire responsible for the plauge. Villages would often dig up corpses they suspected were shroud-eaters in order to dispatch them.
Shroudeater.com - So What Is A Shroudeater?
'Shroud-Eaters': Odd burial is tied to legend of vampires