Krampus is a horned, anthropomorphic figure in Central and Eastern Alpine folklore — traditionally described as half-goat, half-devil, with cloven hooves, a long tongue, and a bundle of birch sticks for beating misbehaving children. He accompanies Saint Nicholas on the night of 5 December, known as Krampusnacht, immediately preceding the Feast of St Nicholas on 6 December: while Nicholas rewards well-behaved children with small gifts, Krampus punishes the badly behaved, ranging in severity by local telling from a swat with a birch rod to being stuffed in his sack and dragged away entirely.
The name itself likely derives from the Old High German krampen, meaning "claw" — a fittingly blunt etymology for a fittingly blunt figure. Regional counterparts exist across the wider area under different names and slightly different personas: Knecht Ruprecht in much of Germany, Schmutzli in Switzerland, Père Fouettard in France and Luxembourg, and Zwarte Piet in the Netherlands — all filling broadly the same structural role as Nicholas's punishing counterpart.