Krampus

Krampus is the name of an upcoming mob in the Don't Starve December 7th "Naughty and Nice" update. He appears at the end of the teaser video.

Other than what is shown in the teaser video, little is known about him, especially his rules of spawning and behavior.

However, he is known to invade a player's camp and attack their chests, breaking them open and stealing what is inside. He appears to move fairly fast, but information about his hitpoints and attack strength is unknown.