The trio head to Hogwarts, entering the school with the help of Dumbledore's brother Aberforth. Voldemort is alerted to Harry's whereabouts, and mounts an assault on Hogwarts. The teachers and students mobilize to defend the school. Ron and Hermione destroy Hufflepuff's cup with basilisk fangs from the Chamber of Secrets. Harry discovers that the Horcrux is Ravenclaw's diadem. The trio find the diadem in the Room of Requirement, but are ambushed by Draco, Crabbe and Goyle. Crabbe attacks them using a cursed fire, but fails to control it; the fire kills him and destroys the diadem. Meanwhile, many are killed in Voldemort's assault.