Ch. 201Magical Exhaustion, Mental Overdraft
Brook discovered that Hermione had suffered Magical Exhaustion and Mental Overdraft after using the Ravenclaw diadem, and he brought her to the infirmary for treatment. After she fell asleep, he retrieved the diadem and failed to detect its hidden soul fragment, then thought of another person who might help.
- Brook carried Hermione to the infirmary, where Madam Pomfrey diagnosed Magical Exhaustion and Mental Overdraft and treated her with a Lucid Dream Potion.
- Brook sent a silver bird to ask Professor Sprout for leave and stayed beside Hermione as she fell asleep, asking him not to destroy the diadem.
- Brook used a Space Gate to enter the empty girls' dormitory and found the Ravenclaw diadem beneath Hermione's pillow.
- Brook took the diadem to the boys' dormitory and tried detection spells and Fiendfyre, but the diadem remained unresponsive and he hesitated to destroy it.
- Brook considered asking Dumbledore or Voldemort for help, then remembered someone else and produced an old quill from his ring.