Draugluin was bred from the wolves and inhabited with an evil spirit sent by Morgoth himself, Draugluin was a dreadful, old, and evil abomination and was the lord and sire of all werewolves of Beleriand, and dwelt with his master Sauron in Tol-in-Gaurhoth, the former watchtower of Finrod Felagund.
Draugluin was the sire of Carcharoth and many other werewolves. It is probable the Wargs of the Third Age and the White Wolves were descended from him, as these wolves could speak, suggesting they had Fëar.
Draugluin means "Blue wolf" in Sindarin, from draug ("wolf") and luin ("blue"). Drauglir was an earlier form of the name.