In Norse mythology, Sköll (Old Norse "Treachery") is a warg that chases the horses Árvakr and Alsviðr, that drag the chariot which contains the sun (Sól) through the sky every day, trying to eat her. Sköll has a twin brother, Hati, who chases Máni, the moon. At Ragnarök, both Sköll and Hati will succeed in their quests and eat the sun and moon.
Sköll, in certain circumstances, is sometimes referred to as the son of Fenrir which is wrong. Skoll, Hati and their kind come from a forest named Járnviðr. In the forest there are giantesses that are called Járnviðjur, one of the giantesses bears many giants for sons, all in the form of wargs and that's where these wolves come from. '''Mánagarmur''' (Moon hound) is the greatest of all the wolves that come from the forest Járnviðr.
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- Orchard (1997:150).