Fenrir Greyback

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Fenrir Greyback was a werewolf notorious for his savagery and preference for attacking children. He strived to infect as many people as possible with lycanthropy, hoping to build an army strong enough to eventually take over the wizarding community. It was he who infected Remus Lupin with lycanthropy when Remus' father Lyall Lupin insulted werewolves saying "they deserve nothing less than death."

During the Second Wizarding War, Greyback and the pack of werewolves he led allied themselves with Lord Voldemort. Greyback fought in the Battle of the Astronomy Tower, during which he expressed an eagerness to bite the children of Hogwarts and left Bill Weasley badly scarred, and later that year led a gang of Snatchers when Voldemort was in control of the Ministry of Magic. Greyback fought in the Battle of Hogwarts, where he at one point attacked Lavender Brown, but was incapacitated by a Blasting spell by Hermione and then a crystal ball to the head by Professor Trelawney. During the second part of the battle, where both sides faced-off in the Great Hall, he was defeated by Ron Weasley and Neville Longbottom.

It is likely that after the final battle of the Second Wizarding War Greyback was either killed or imprisoned in Azkaban for life as punishment for the crimes he commited against wizardkind.