Sköll, meaning "Treachery" in Old Norse, is a warg that chases the horses Árvakr and Alsviðr, that drag the chariot which contains the Norse goddess of the sun Sól through the sky every day, trying to devour her.

Sköll has a brother, Hati, who chases Mani, the Norse god of the moon. At Ragnarök, both Sköll and Hati will succeed in their quests.

Sköll along with his brother is also said to be the child of the monster wolf, Fenrir, whom shall devour the chief of the Norse gods Odin at Ragnarok. Sköll was said to have taken his father's attributes in devouring any ray of hope that both the gods and humanity have, and that ray being the very sun itself.