Naughtiness is generated by killing certain creatures (either with a weapon or by 'Murdering' them in the inventory). Krampus will not steal the Eye Bone, Lucy the Axe, Willow's Lighter, Abigail's Flower, Pile o' Balloons, Divining Rod, or Wooden Thing components, unless these items are inside a Backpack. Krampus cannot break or steal from Ice Boxes, Drying Racks, Crock Pots or most other structures that can hold items (other than normal Chests). He will keep running around the player until no more items exist on-screen, then disappear into his sack. He will break Chests to steal items and will pick up most items laying on the ground in the player's vicinity, including any and all types of Backpacks. He runs away when approached, similar to the behavior of a Gobbler or MacTusk. Krampus moves fairly fast and deals 50 damage per hit. When killed, Krampus will drop any stolen items, two pieces of Charcoal, one Monster Meat, and, very rarely, his Krampus Sack (1% chance). It takes 3 blasts from the Ice Staff to freeze Krampus and 1 shot from a Sleep Dart to put him to sleep. Krampus appears when overzealous hunters gain too much naughtiness from killing innocent creatures too fast. Krampus (plural Krampii) is a neutral monster that steals the player's stored items and items left on the ground. “ He really puts a damper on this time of year.

Cartoon toucan