Moonstone

The Moonstone is a mystical rock, said to be the source of all werewolf powers. As seen in Night of the Poodle, it was responsible for transforming Freddy Lupin's ancestor, Harlin Lupin into the first werewolf in existence, by merging him with the wolf Longtooth. In Beast in Show, it was revealed that the other half of the rock went by the name Doom Rock which was under the ownership of the dogs until Friar Jagger, Scarlet's ancestor stole it from them.