Kulmking

Kulmking are a type of malevolent monster found in Estonian folklore that were believed to be the result of unholy undead spirits that would take many forms and frequent varied haunting grounds, though always public, as the demon had an inability to enter private places without invitation (a trait that would later be found in monsters of other folklore such as vampires and certain types of ghosts).

The usual habits of a Kulmking included eating children who strayed into the forests, possessing people, turning people into devils and generally causing havoc as lesser personifications of evil.