Krampus (Coven, Book 13.5)

You better watch out, you better not cry!

It’s the holidays and Samantha and Steven take baby Josh to see an unpleasant Santa at the mall. Meanwhile, Kathy discovers a monster leering outside their house, scaring the neighborhood children.

When Kathy steps in to intervene, the monster becomes fixated on Josh, leaving the sisters scrambling to figure out how to stop the beast. 

Krampus is a short story in the Coven series, which is part of the Art of Magic universe, containing the Lost By Magic and the Under the Moon series.