Kallikantzaros

A Kallikantzaros (Greek: Καλλικάντζαρος) pl. Kallikantzaroi is a malevolent goblin in Greek folk tradition. They dwell underground but come to the surface during the twelve days of Christmas, from 25 December to 6 January (from the winter solstice for a fortnight during which time the sun ceases its seasonal movement). Its name is possibly derived from "kalos-kentauros, or "beautiful centaur".