Snape hears of Harry's return and warns staff and students of punishment for aiding Harry. Harry confronts Snape, who flees after Minerva McGonagall challenges him to a duel. McGonagall gathers the Hogwarts community for battle. At Luna Lovegood's insistence, Harry speaks to Helena Ravenclaw's ghost, who reveals that Voldemort performed "dark magic" on her mother's diadem, which is in the Room of Requirement. In the Chamber of Secrets, Hermione destroys the Horcrux cup with a Basilisk fang. In the Room of Requirement, Draco, Blaise Zabini and Goyle attack Harry, but Ron and Hermione intervene. Goyle casts a Fiendfyre curse and, unable to control it, is burned to death while Harry and his friends save Malfoy and Zabini. Harry stabs the diadem with the Basilisk fang and Ron kicks it into the Room of Requirement, where it is destroyed. As Voldemort's army attacks, Harry, seeing into Voldemort's mind, realises that Voldemort's snake Nagini is the final Horcrux. After entering the boathouse, the trio witness Voldemort telling Snape that the Elder Wand cannot serve Voldemort until Snape dies; he then orders Nagini to kill Snape. Before dying, Snape tells Harry to take his memories to the Pensieve. In the chaos at Hogwarts, Fred, Lupin, and Tonks have been killed.