<P> Voldemort appears at the climax of the fifth book, Harry Potter and the Order of the Phoenix, having again plotted against Harry . In this book, Harry goes through extreme emotional stress, and according to Rowling, it was necessary to prove that Harry is emotionally vulnerable and thus human, in contrast to his nemesis Voldemort, who is emotionally invulnerable and thus inhuman: "(Harry is) a very human hero, and this is, obviously, there's a contrast, between him, as a very human hero, and Voldemort, who has deliberately dehumanised himself . (...) and Harry, therefore, did have to reach a point where he did almost break down ." In this book, Voldemort makes liberal use of the Ministry of Magic's refusal to believe that he has returned . Voldemort engineers a plot to free Bellatrix Lestrange and other Death Eaters from Azkaban and then embarks on a scheme to retrieve the full record of a prophecy stored in the Department of Mysteries regarding Harry and himself . He sends a group of Death Eaters to retrieve the prophecy, where the Order of the Phoenix meets them . All but Bellatrix are captured, and Voldemort engages in a ferocious duel with Dumbledore . When Dumbledore gets the upper hand, Voldemort attempts to possess Harry but finds that he cannot; Harry is too full of that which Voldemort finds incomprehensible, and which he detests as weakness: love . Sensing that Dumbledore could win, Voldemort disapparates, but not before the Minister for Magic sees him in person, making his return to life public knowledge in the next book . </P> <P> Voldemort does not appear in Harry Potter and the Half - Blood Prince, although his presence and actions are felt: he once again declares war, and begins to rise to power once more . He murders Amelia Bones of the Department of Magical Law Enforcement, and begins to target members of the Order of the Phoenix, including Emmeline Vance . </P> <P> Rowling uses several chapters as exposition to establish Voldemort's backstory . In a series of flashbacks, using the pensieve as a plot device, she reveals that Voldemort is the son of the witch Merope Gaunt and a muggle called Tom Riddle . Riddle abandons Merope before their child's birth, soon after which Merope dies, just hours after giving birth . After living in an orphanage, young Riddle meets Dumbledore, who tells him he is a wizard and arranges for him to attend Hogwarts . Riddle is outwardly a model student, but is in reality a psychopath who takes sadistic pleasure in using his powers to harm and control people . He eventually murders his father and grandparents as revenge for abandoning him . The book also discusses Riddle's hatred of "Muggles", his obsession with Horcruxes, and his desire to split his soul to achieve immortality . Rowling stated Voldemort's conception under the influence of a love potion symbolises the prejudicial circumstances under which he was brought into the world . </P> <P> In the main plot of the book, Voldemort's next step is to engineer an assault on Hogwarts, and to attack Dumbledore . This is accomplished by Draco Malfoy, who arranges transportation of Death Eaters into Hogwarts by a pair of Vanishing Cabinets, which bypass the extensive protective enchantments placed around the school . The cabinets allow Voldemort's Death Eaters to enter Hogwarts, where battle commences and Dumbledore is cornered . Hogwarts professor (and re-doubled agent) Severus Snape uses the Killing Curse against Dumbledore when Draco could not force himself to do so . </P>

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