Lord Voldemort owner of Nagini
Harry Potter and the Deathly Hallows
In Harry Potter and the Deathly Hallows, Voldemort furthers his quest for ultimate power. He disposes of the Minister for Magic and replaces him with Pius Thicknesse, who is under the Imperius Curse. Establishing a totalitarian police state, he has Muggle-borns persecuted and arrested for "stealing magic" from the "pure blood" wizards. After failing to kill Harry with Draco's father Lucius Malfoy's borrowed wand (to avoid the effect of Priori Incantatem), he goes on a murderous search for the Elder Wand, the most powerful wand ever created, seeing it as the weapon he needs to overcome Harry's wand and make him truly invincible. He goes on a quest that takes him out of the country to Gregorovitch's wand shop, where he kills the old wandmaker. His journey also takes him to Nurmengard, the prison where Gellert Grindelwald is kept, and he kills Grindelwald as well. He finally locates the Elder Wand and steals it from Dumbledore's tomb.
Later, Voldemort finds out that Harry and his friends are hunting and destroying his Horcruxes when informed of their heist on the Lestranges' vault at Gringotts in search for Hufflepuff's Cup. After offering the occupants of Hogwarts mercy if they give up Harry, he assembles a large army and launches an invasion of the castle, where Harry is searching for Ravenclaw's Diadem. Voldemort orders his pet snake Nagini to execute Snape, believing it would make him the true master of the Elder Wand, since Snape killed Dumbledore. He then calls an hour's armistice, in exchange for Harry. When Harry willingly walks into Voldemort's camp in the Forbidden Forest, Voldemort strikes him down with the Elder Wand. However, the use of Harry's blood to resurrect Voldemort's body proves to be a major setback: while Harry's blood runs in Voldemort's veins, Harry cannot be killed as his mother's protection lives on now in Voldemort too. Instead, Voldemort destroys the part of his own soul that resides in Harry's body. Voldemort forces Rubeus Hagrid to carry Harry's apparently lifeless body back to the castle as a trophy, sparking another battle during which Nagini, his last Horcrux, is destroyed by Neville Longbottom. The battle then moves into the Great Hall, where Voldemort fights Minerva McGonagall, Kingsley Shacklebolt, and Horace Slughorn simultaneously. Harry then reveals himself and explains to Voldemort that Draco became the true master of the Elder Wand when he disarmed Dumbledore; Harry, in turn, won the wand's allegiance when he took Draco's wand. Refusing to believe this, Voldemort casts the Killing Curse with the Elder Wand while Harry uses a Disarming Charm with Draco's, but the Elder Wand refuses to kill its master and the spell rebounds on Voldemort who, with all of his Horcruxes destroyed, finally dies. His body is laid in a different chamber from all the others who died battling him.Rowling stated that after his death, Voldemort is forced to exist in the stunted infant-like form that Harry sees in the King's Cross-like limbo after his confrontation with Voldemort in the Forbidden Forest. Rowling also mentioned that, despite his extreme fear of death, he cannot become a ghost.