about The Elder Wand

The Elder Wand, known throughout history as the "Deathstick" and the "Wand of Destiny", is an extremely powerful magic wand made of elder wood. Supposedly, it is the most powerful wand in existence, and when used by its true master, he or she cannot be defeated in a duel. It also appears, as the wand is somewhat sentient, as are all wands, that it will not allow itself to cause real harm to its true Master. The wand's ownership, however, is a tricky matter. As stated by master wandmaker Mr. Ollivander, ownership can only be transferred properly. That is, the wand will only fully work for the new user if they disarm, stun, or kill the previous user. This can occur during a duel (although because the Wand is very powerful, this scenario would be rare), or in non-magical ways (killing in Muggle fashion, etc). If a master dies naturally without ever being defeated, the wand's power will die too, as it had never been won from its master.
After boasting of his unbeatable wand, Antioch Peverell met his end— murdered in his sleep by a rival wanting to claim the wand. Ever since, the wand has been sought by power-hungry wizards. It moved to Emeric the Evil, then to Egbert the Egregious. It vanished for some time until resurfacing under the control of Godelot, whose son Hereward took it from him. After another disappearance Barnabas Deverill owned the wand and was killed by Loxias, who was then killed by either Arcus or Livius. It eventually came to the possession of Gregorovitch, a Bulgarian wandmaker. Gregorovitch boasted about how he possessed the Elder Wand, as it would boost his popularity as he tried to reverse engineer its secrets as he faced competition from Ollivander. It subsequently fell to Grindelwald, who stole it from the famed wandmaker. It is not known if Gregorovitch mastered its secrets properly but he did have a reputation in Europe. Since full control of it passed to Dumbledore when he defeated Grindelwald, presumably the Stunning Spell Gellert sent at Gregorovitch stunned him causing possession of the wand to switch to Grindelwald. In Deathly Hallows, Rowling never explicitly states whether or not Grindelwald became the master of the Elder Wand, because the narration stated that Grindelwald stole the wand from Gregorovitch, so theoretically Grindelwald was never the master of the wand (although it could be that when Grindelwald used the wand to stun and overpower its previous owner the wand recognised a superior master). This scenario appears initially more probable considering the fact that Dumbledore was renowned for having defeated Grindelwald in a duel. The most probable explanation is that Grindelwald was indeed master of the Elder Wand. Albus Dumbledore later defeated Grindelwald and became the wand's master. This defeat could happen because Dumbledore was the better wizard, even though Grindelwald brandished the better wand.
When Dumbledore arranged his death with Snape (as revealed in the The Prince's Tale chapter of Deathly Hallows), he meant Snape to "end up with the Elder Wand." Because his death would not have been the result of his defeat, Dumbledore hoped this might break the wand's power. However, since Draco Malfoy disarmed Dumbledore, the plan failed and Draco became the wand's new master. After Dumbledore's death, the wand was placed inside his White Tomb. Voldemort opened it and claimed the wand as his own. Only later did he learn that he never mastered the wand because he did not gain ownership from its previous owner. He has mistakenly believed the wand's previous owner to be Snape, since Snape had been the one to kill Dumbledore. The wand's allegiance was later won by Harry when he struggled with Draco and disarmed him, even though Draco never had the Elder Wand itself in his possession.
Voldemort cast four Killing Curses on Harry, but each lacked the desired effect. The first Killing Curse's failure, according to Dumbledore, was due to Lily Potter's self-sacrifice to protect Harry, at which point Harry became the unintended Horcrux. The second Killing curse is in the fourth book, where the twin cores protected Harry and the imprints of Voldemort's victims gave Harry time to escape. The Elder Wand did destroy Voldemort's soul fragment inside Harry with the third killing curse (Voldemort could not kill Harry, but he could certainly destroy that part of himself). The Killing Curse knocked Harry into a death-like state for a few moments, in which in his mind he was given a choice to "move on" to the afterlife or return to the living world, and he chose the latter. Voldemort's Cruciatus Curse, used on Harry when Voldemort thought he was dead, caused no pain to Harry. In the final battle, the Elder Wand recognizes its true master, and when confronted with Harry's Expelliarmus charm, the wand causes Voldemort's final Avada Kedavra curse to rebound and kill him. Harry is the wand's true master and the wand cannot hurt its owner.
Harry uses the Elder Wand to repair his damaged holly and phoenix feather wand (an act that the great wandmaker Mr. Ollivander believed improbable according to what he knew—he mentions that wandlore is very ancient and complicated).
J.K. Rowling revealed in an interview that one of the working titles for Deathly Hallows was Harry Potter and the Elder Wand.
Harry intends to return the wand to Dumbledore's tomb. He determines that, if he dies of a natural death, the power of the wand will die out with him.

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