In "Harry Potter and the Deathly Hallows", Harry, Ron and Hermione leave Hogwarts to complete Dumbledore's task: to search for and destroy Voldemort's remaining four Horcruxes, and then find and kill the Dark Lord. The three put themselves against Voldemort's newly formed totalitarian police state, an action that tests Harry's courage and moral character. According to J.K. Rowling, a telling scene in which Harry uses "Cruciatus" and "Imperius" (unforgivable curses for torture and mind-control) on Voldemort's servants shows a side to Harry that is "flawed and mortal." However, she explains that, "He is also in an extreme situation and attempting to defend somebody very good against a violent and murderous opponent".