Arc 17Dementors and the Diadem
William and Hermione traveled back in time to stop a Dementor invasion of Hogwarts and discovered that a Dementor had taken Ravenclaw’s Diadem, which contained a piece of Voldemort’s soul. They destroyed the soul fragment while preserving the Diadem, and learned of three other Horcrux clues.
- William mourned Norbert with Hagrid, then captured and released Fire Kiss after learning she was Ronan’s sister and had been testing him.
- William discovered that Sanmao had broken Dahei’s cage lock, rebuilt Ravenclaw’s Quidditch team, and began preparing for the season.
- William and Hermione met MACUSA Auror Mera Picquery, who sought the Thunderbird and help for Newt, while Hermione, Ginny, and Luna were caught sneaking into Hogsmeade.
- After Snape imprisoned Ron for selling photographs of him, Dementors invaded Hogwarts, and Dumbledore sent William and Hermione back in time to stop them.
- William and Hermione lured most of the Dementors into a hidden room, but one found a rusty diadem and another Dementor put it on.
- The diadem-wearing Dementor claimed to embody Ravenclaw’s will, then Voldemort appeared through it and fought William and Hermione.
- William destroyed the giant Dementor with flaming Patronuses, then sent Little Black Robe to consume the soul fragment inside the Diadem.
- The Dementor recalled Voldemort’s diary, Slytherin’s Ring, and the Gaunt Shack when William asked about the other Horcruxes.