Arc 18Black’s Hidden Form
William and Dumbledore investigated the Gaunt Shack and learned more about Voldemort’s Horcruxes, while the school dealt with Buckbeak’s case and an anonymous Christmas gift mystery. Hermione uncovered that Sirius Black had been appearing as Dahei, and Lupin’s confession led William and Dumbledore to suspect that Scabbers was Peter Pettigrew.
- William learned from Dumbledore that Ron might be affected by suggestive magic, then showed him Ravenclaw’s Diadem and discussed Voldemort’s search for a Hogwarts post.
- William and Dumbledore visited the Gaunt Shack, where they found Lockhart’s corpse and a cursed ring, but Tom’s voice and a magical blizzard revealed that the Horcrux had been taken.
- William helped Hagrid prepare for Buckbeak’s hearing while Fudge considered the case, and Christmas brought William, Hermione, Anne, and Harry anonymous Firebolts and other costly gifts.
- At Nicolas’s estate, Nicolas explained that Ravenclaw’s Diadem had already been ruined by age and that repairing it might require Slytherin’s Wand to unlock the Book of Alchemy.
- Hermione realized that Black could be an unregistered Animagus who took the form of Dahei, and she and William went to warn Dumbledore.
- Lupin confessed that Black, James, and Peter had become Animagi, and William connected Peter’s rat form to Scabbers as Dumbledore summoned Ron and the rat.