Fenrir Greyback, dungeon master and torturer of Slytherin, was a great beast of a man with long, dirty grey hair and wolf-pale blue eyes, set in a leathery face. Scars marred almost every visible inch of his body. He was dressed as usual in a black cloak that soaked up light like a sponge. Rosier was giving him a wide berth, and Hermione could not blame him: Greyback was filthy, crude, and deranged. Not even most of the other Slytherins liked him. Hermione herself had managed to accustom herself to his presence, but at the beginning of her tenure as spymistress she had been forced to break his bones several times before he recognised her authority over him.