Magnus’s Infallible Elixir was the key to the whole thing. It was a hair potion. An exceedingly low-quality one, too, filled with magnifying and enhancing ingredients so poorly blended that chunks sometimes stoppered up the bottle. Not meant to be taken internally. But when it came to werewolves, all the usual rules went out the window, and the enhancing ingredients in the Elixir were exactly what was needed to help blast the corrupting influence out of a werewolf’s system.