Rubeus Hagrid
Another attack occurs, and Harry, Ron, and Hermione suspect Draco is the Heir, given his hostility toward Muggle-borns. To confirm this, Hermione concocts Polyjuice Potion, which allows Harry and Ron to impersonate Draco's lackeys Crabbe and Goyle. They discover that Draco is uninvolved. Moaning Myrtle, a ghost that haunts a girls' bathroom, shows them a diary left in her stall. The diary belonged to Tom Riddle, a student who witnessed a fellow student's death during the previous opening. Riddle's consciousness in the diary claims to Harry Rubeus Hagrid was to blame. Hermione is petrified in the next attack, and the school is put on lockdown, with headmaster Albus Dumbledore and Hagrid forced to leave.