Every Harry Potter fan will know there were a number of horcruxes that he had to find to defeat Voldemort, but you'd be forgiven for forgetting exactly how many or what they were.
Such was the complexity and genius with which the Harry Potter books were written that when many people whizzed excitedly through the final book at lightning speed, they had to go back to get their head around how the Dark Lord was stripped of his immortality.
Horcruxes are objects infused with dark magic that allow their owner to become immortal by holding a piece of their soul within them.
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Part of Harry's quest is to destroy each one in order to defeat Lord Voldemort, who renamed himself from Tom Riddle. Seven is, of course, the most magical number, which is why Voldemort split his soul into seven - each time committing murder to do so.
One piece of his soul remained inside him and he chose six objects with a special meaning or connection to him in which to place the other six pieces. However, he accidentally created a seventh horcrux and so split his soul into eight pieces.
Here is how each of them was discovered and destroyed.
1. Tom Riddle's Diary
This is the first horcrux readers and watchers of Harry Potter learn about in the second book and film.
However, just like Harry, we don't actually know it's a horcrux when it's being destroyed. All we know is that Tom Riddle preserved his 16-year-old self in its pages so that one day he could unleash Slytherin's monster, the Basilisk, upon Hogwarts and purge the school of 'Mudbloods'.
Harry destroyed Tom Riddle's diary with a Basilisk fang, by luck rather than judgement. When he used the Sword of Gryffindor to kill the Basilisk, he also rather fortunately created another horcrux-killing weapon which would eventually come in very handy in the woods and at the Battle of Hogwarts.
He later used the diary to trick Lucius Malfoy into giving Dobby the house elf clothes - meaning Dobby would become a free elf ("Dobby is free!").
2. Marvolo Gaunt's Ring
Marvolo Gaunt's ring is tied to Voldemort's family and previously contained the Resurrection Stone.
Voldemort murdered Tom Riddle Senior and his own grandparents.
Morfin Gaunt, Voldemort's uncle, had a false memory that led him to confess to the murders he didn't commit and was sent to Azkaban prison as punishment.
Albus Dumbledore, headmaster of Hogwarts during Harry's time at the school, destroyed the ring between the events of Harry Potter and the Order of the Phoenix and Harry Potter and the Half Blood Prince. However, Dumbledore was victim to a powerful curse only partially contained by Professor Snape.
It left his hand blackened and gave him a death sentence, which led him to take matters into his own hands, and set up the scene where Snape kills him to prevent Draco Malfoy's soul becoming tainted and secure super spy Snape's place at the unsuspecting Dark Lord's side.
The Resurrection Stone was then placed inside a Snitch which was later given to Harry in Dumbledore's will and used to recall his parents, Sirius Black and Remus Lupin as moral support before he faced his death in the Forbidden Forest.
3. Salazar Slytherin's Locket
Like the ring, the locket belonged to the Gaunt family.
The horcrux was taken to Twelve Grimmauld Place where Kreacher, the family's house elf, tried to destroy it on one-time Death Eater Regulus Black's orders.
Mundungus Fletcher stole the locket but was forced to give it to Dolores Umbridge. Harry, Ron and Hermione finally managed to obtain the locket and Ron destroyed it in the forest using the Sword of Gryffindor.
4. Helga Hufflepuff's Cup
Hermione Granger destroyed the cup that was left with Bellatrix Lestrange and was kept secure in a vault at Gringotts, which she, Ron and Harry broke into with the help of Griphook the goblin.
She used a fang from the Basilisk's corpse, similar to how Harry destroyed Tom Riddle's diary, after she and Ron headed down to the Chamber of Secrets during the Battle of Hogwarts in Harry Potter and the Deathly Hallows (Part 2 in the film adaptation).
5. Rowena Ravenclaw's Diadem
The Diadem of Rowena Ravenclaw was the only horcrux to be accidentally destroyed, in a fire - but not just any fire.
Vincent Crabbe, ironically the son of a Death Eater, used the Fiendfyre Curse which caused an out-of-control fire in the Room of Requirement at Hogwarts, which is where the 'lost diadem' was hidden by Voldemort.
It both destroyed the diadem and killed Crabbe himself. Harry, Ron and Hermione saved his Slytherin housemates Gregory Goyle and Draco Malfoy using flying broomsticks.
In the film adaptation Blaise Zabini replaced Vincent Crabbe in the scene because the actor who played Crabbe was convicted of a drug offence. But in the film, Gregory Goyle, as a much more established character, is chosen as the conjurer of the Fiendfyre, and so he dies.
6. Harry Potter
The only horcrux made by mistake was Harry Potter himself.
Voldemort's attempted murder of Harry Potter as a baby left more than a lightning-shaped scar on his forehead, as a piece of his soul attached to Harry.
This is why Harry was born with the ability to share thoughts with Voldemort and was able to speak Parselmouth.
Dumbledore figured this out and knew that Voldemort had to kill Harry, or at least attempt to kill him, in order to kill the horcrux inside him. The tricky bit was making Harry the Master of Death. To do that he had to get all three of the Deathly Hallows - the Elder Wand, the Cloak of Invisibility and the Resurrection Stone - into Harry's possession.
And crucially, Harry had to willingly go to his death not fearing it. That is what being the true Master of Death means.
Harry survived because Voldemort resurrected himself in Harry Potter and the Goblet of Fire using Harry's blood. In doing so he transferred Harry's mother, Lily's, protection into himself.
To backtrack a little, Lily giving her life to try to save Harry in Godric's Hollow when he was a baby meant he had a magical protection. So, in transferring that protection to himself, Lord Voldemort effectively tethered Harry to himself, so Harry couldn't die while Voldemort lived.
His Avada Kedavra curse in the Forbidden Forest, then, failed to kill Harry but did kill the horcrux inside Harry.
7. Nagini the Snake
Nagini, Voldemort's pet snake, was one of the more surprising horcrux reveals, perhaps due to being an animal. But arguably one of the hardest to kill given how terrifying it is and the fact it has the ability to attack and eat you.
During the Battle of Hogwarts, Nagini was beheaded by Neville Longbottom, who used the Sword of Gryffindor to remove Voldemort's final protection from mortality and allow Harry to face him for a final showdown and kill him once and for all.
Nagini was the last horcrux to be destroyed and also the last to be made. It was created when Peter Pettigrew bumped into Ministry of Magic employee Bertha Jorkins in Albania while Voldemort was still weak. Her murder, after Voldemort's servant Pettigrew led her into the woods, allowed him to create the final horcrux and achieve his goal of splitting his soul into seven pieces.
Little did he know, he'd already achieved that.
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