Krampus

Krampus was a cursed Satyr that appeared in The Hog's Belly and covered it with snow. After he got killed, his corpse turned back into that of a normal Satyr.

Appearance
Krampus was a 10 ft tall, blackskinned, cursed Satyr. He had a long red toungue and jagged blackened teeth. His hair was very thin and long, also black. On his head rested two gigantic horns.

Background
The tale of Krampus is a legend about a Satyr that when it get's close to Winter's Veil, transforms into a tall, monstrous version of himself. Krampus his goal is to put as many naughty people in his bag, and right before the night ends, he will eat everyone he captured. When that ritual is performed, Krampus disappears again until the next year.

"He sees you when you're sleeping" (3x01)
Krampus appeared in The Hog's Belly and had put one of the servers in his big cursed bag. The party woke up from the noise he caused and fought and killed Krampus, the finishing blow dealt by Kiseran Duadhe, who very stylishly cut him to pieces. When Krampus died his corpse turned back into his normal Satyr self.