Arc 36The Diadem and the Department
William and Hermione searched for Grindelwald, who left to seek Death, while the school year ended with Ravenclaw winning the Quidditch Cup. When Voldemort lured Harry toward the Department of Mysteries, William stayed behind to repair Ravenclaw’s Diadem with time magic, transforming it into a flowering branch of Elder Wood.
- Sirius found a Dementor in the Vanishing Cabinet William sent him, and William and Hermione arrived at Durmstrang to protect him from Voldemort.
- William accepted Voldemort’s challenge and fought him outside Durmstrang, then claimed to be Grindelwald’s agent to secure Voldemort’s demand for a meeting.
- William and Hermione followed clues from Andersen’s Fairy Tales to the Snow Queen’s palace, where they found Grindelwald inside the North Sea Kraken.
- Grindelwald explained his plans to seek Death, received Davi Rosier’s letters from William, and later left with the Kraken as the polar day began.
- William and Hermione returned to Hogwarts, where Sirius became trapped in the cabinet and Harry struggled with his discovery of James’s treatment of Snape.
- Ravenclaw defeated Hufflepuff to win the Quidditch Cup after Cho let Cedric catch the Snitch, and Fudge’s trial was moved to Merlin Memorial Hall.
- Voldemort planned to draw Harry to the Department of Mysteries while key Order members were away, but Anne gathered Harry’s friends and led them there through the Floo Network.
- William, disguised as Anne, told Luna that Sirius was safe and Harry was walking into a trap, then used Fawkes and time magic to transform Ravenclaw’s Diadem into a flowering Elder Wood branch.