Draugluin was the master of all the werewolves of Angband. He was killed in a fight with Huan at Tol-in-Gaurhoth, though he managed to run back to Sauron and told him that Huan was nearby before he died. His wolf guise was then used by Huan, and later Beren, when they took a silmaril from Morgoth's crown.

Carcharoth, who became Huan's bane, was a cub of Draugluin's breed.
Encyclopedia entry originally written by Malinornë