Cursemute
The Cursemute was a series of spells cast by Avacyn to alter the nature of the werewolves of Innistrad. The spell mystically bound together the wolf spirit and human spirit of the werewolves into one, turning all willing werewolves into wolfir, wolven servants with an inner-peace. In rarer cases, the victims were fully cured.
The Cursemute also had an effect on other curses in Innistrad. Notably, it affected the curse of the Chain Veil on Garruk Wildspeaker, allowing the hunter to regain his sanity for some time.
The Cursemute was reversed when Avacyn herself was changed into a creature with pure hatred for humankind.