According to central Eastern European folklore, Krampus is a half-goat, half-demon being who brings yuletide horror to naughty kids in this part of the world.
Krampus has his own special day or should I say night. It is known as Krampusnacht and occurs on December 5. Legend has it that this is the time when Krampus visits bad children and terrorizes them as punishment for being bad. He might leave them a bundle of birch sticks, but kids who really tick him off could get beaten with the sticks or worse. What could be worse than getting beaten with sticks? According to Mental Floss, “he might toss them into a sack or basket on his back and then throw it in a stream, or he might straight-up take them to hell.”
On December 5, there are Krampus-themed celebrations including Krampus balls and Krampuslauf or Krampus runs that involve people parading through town dressed as Krampus monsters. You might want to think twice about watching Krampus runs because these costumed Krampus revelers have been known to beat spectators on the legs regardless of whether they’ve been bad or good.
Even though he may appear only one day out of the year, the threat of Krampus lingers. Some people keep birch twig decorations around the house on a year-round basis to remind their children of the dark being who will visit them on December 5 if they misbehave.
“9 Facts About Krampus, St. Nick’s Demonic Companion” by Jess Zimmerman http://mentalfloss.com/article/71999/9-facts-about-krampus-st-nicks-demonic-companion