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Fanfic / Harry Potter and the Perversion of Purity

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Harry Potter and the Perversion of Purity is a Harry Potter fanfiction written by ACI 100, who can be found here on Archive of Our Own, and here on

The fanfiction itself can be found here on Archive of Our Own, and here on

Harry Potter was a naive, malleable child when he first entered the wizarding world. What if instead of meeting a good, noble family and being guided towards the light, he met a shadier bunch and was warped and twisted in ways that led to a much darker Magical Britain?
  • Book 1 - The Fracturing of Foundations
  • Book 2 - The Erosion of Innocence
  • Book 3 - The Looming of Shadows
  • Book 4 - The Deadliest of Games

This fic provides examples of:

  • Abusive Parents: The Dursleys are just as awful to Harry as they are in canon, if not more so.
  • Accidental Murder:
    • Ron Weasley, wielding the Sword of Gryffindor, charges at the basilisk with his eyes closed in order not to die meeting its gaze, and ends up stabbing Luna Lovegood when it moves out of the way.
    • Unlike in canon where we don't get confirmation which one of them gets the killing blow, in this story we know that Albus is the one to accidentally kill his sister, Ariana, when she gets in the way of his fight with Gellert Grindelwald. We are not even sure if Albus himself is aware that it was his spell that killed her.
  • Adaptational Backstory Change: In canon, Harry Potter's grandparents are Fleamont and Euphemia Potter. In this story his grandparents are Charlus Potter and Dorea Black.
  • Adaptational Badass: Neville Longbottom ends up filling the role of canon Harry for the most part. He's the one to join Ron in saving Hermione from the troll in the girl's bathroom, resulting in him becoming the third member of the 'Golden Trio'. He tries to help smuggle Hagrid's pet dragon out of Hogwarts. He researches the Philosopher's Stone, and even confronts Voldemort at the end of Book 1, which unfortunately ends with his death.
  • Adaptational Early Appearance: Aberforth Dumbledore, who is the Defense Against the Dark Arts professor during Harry's 2nd year at Hogwarts.
  • Adaptational Expansion: The series goes into greater details about the culture of the wizarding world and magical history.
  • All of the Other Reindeer: Harry spends quite a bit of Book 2 alone after getting into an argument with Draco. During this time he gets either ignored or bullied by the other Slytherins due to him being both a half-blood and the Boy-Who-Lived.
  • Anti-Magic: Outside of just making you invisible, the Deathly Hallows cloak of invisibility allows the wearer to be resistant to any kind of magic, but in turn also means the wearer can't use any magic themselves.
  • Ascended Extra:
    • With Harry being sorted into Slytherin, many of the characters sorted into that House end up having a much bigger role.
    • Cedric Diggory, Susan Bones, and Hannah Abbott end up befriending Ron and Hermione at the end of Book 1, and therefore have a much bigger presence in Book 2 onwards.
  • Badass Bookworm: Harry spends alot of his free time reading books on magic, but is also leaps and bounds ahead of his yearmates in most subjects.
  • Big Brother Instinct: Gender-flipped with Cassandra Yaxley towards her younger brother, Cadmus. She knows and admits that Cadmus was the one responsible for his own beatdown at the hands of Harry, but she also warns Harry to not do something like that again, as she doesn't like seeing her brother injured like that.
  • Burn the Witch!: This almost happens to Grindelwald when he was a young boy, before being saved by his father at the last minute.
  • Chick Magnet: Harry ends up receiving a large pile of letters on Valentine's Day during his 1st year at Hogwarts. Most of them are innocent letters from young girls, though there are a few from older women too.
  • The Corrupter: Ever since first meeting him, Grindelwald has been slowly indoctrinating Harry to believe in his own ideology, espcially regarding muggles. Granted, Harry didn't ever really have a good opinion on muggles be begin with, but he never hated them as he does now before meeting Grindelwald.
  • Deadly Prank: The Weasley twins are known to take their pranks too far, which they themselves willingly admit. The most brutal example is when they use runes to make a statue explode near Harry, which leaves him on fire with pieces of the blown up statue piercing his skin. If Diana and Cassie didn't reach him in time then he would've died. Slightly subverted, since they didn't know how powerful the explosion would be, as the runes where given to them by Daphne Greengrass, who actually wanted Harry dead.
  • Death by Adaptation:
    • Neville Longbottom gets his neck broken by Voldemort in the penultimate chapter of Book 1.
    • Luna Lovegood gets stabbed with the Sword of Gryffindor accidentally by Ron Weasley near the end of Book 2.
  • Death of a Child: In one of Grindelwald's memories, Harry sees a little girl, Wylla Nurmen, get stoned to death for showing signs on magic.
  • Demoted to Extra: Gilderoy Lockhart turns down the offer to become the Defense Against the Dark Arts professor in Book 2, so his only appearance is at the Flourish and Blotts book signing.
  • Dies Differently in Adaptation: Sirius Black gets killed in Book 3 by Harry hitting him with a killing curse, rather than in Book 5 by Bellatrix pushing him through the veil.
  • Dreaming of Times Gone By: When Harry goes to sleep, Grindelwald sends him memories of his past.
  • Evil Mentor: Grindelwald ends up becoming one of these to Harry.
  • Eye Scream: Harry defeating Voldemort at the end of Book 1 involves him jamming his fingers knuckle deep into Quirrell's eyes.
  • First Friend: Diana Malfoy is this for Harry Potter.
  • Foolish Sibling, Responsible Sibling: Draco and Diana Malfoy, respectively.
  • Happily Adopted: With the help of Lucius Malfoy (and on the orders of Voldemort), Regulus Black takes custody of Harry Potter from the Dursley family. Despite his wariness of Lucius and Regulus' allegiance, Harry is happy with this arrangement.
  • Hidden Depths: Vincent Crabbe has an interest in magical creatures, and is the one who informs the group on how dementors work. Harry later thinks to himself how strange it is that he knows so little about either Crabbe or Goyle despite knowing them for 2 years at this point.
  • Hiding Your Heritage: Tracey Davis is a muggleborn pretending to be a half-blood. This is due to being sorted into Slytherin, which is the house filled with the most blood supremacists.
  • In the Back: Cadmus Yaxley attempts to curse Harry in the back, and would have probably been successful if it hadn't been for Pansy warning Harry.
  • Kids Are Cruel: Marcus Jugson and Martin Macnair, a 6th and 5th year respectively, gang up and torture a 2nd year Harry at night on the third floor, due to a mixture of blood supremacy and the fact that he's the Boy-Who-Lived.
  • The Man Behind the Man: Voldemort plays this role to Lucius Malfoy, who in turn plays this role to Minister for Magic, Cornelius Fudge.
  • Mentor Archetype: Harry has many over the course of the story: Gemma Fawley, Cassandra Yaxley, Albus Dumbledore, Voldemort, and Gellert Grindelwald.
  • Named by the Adaptation: Tiberius Nott.
  • Original Character: Diana Malfoy: Draco's older sister, and the Heiress to the Ancient and Most Noble House of Malfoy.
  • Rivals Team Up: Harry Potter, Draco Malfoy and Ron Weasley team up to take on the Heir of Slytherin near the end of Book 2.
  • Spared by the Adaptation: Regulus Black.
  • Speaks Fluent Animal: Tom Riddle and Harry Potter can speak parseltongue.
  • Starter Villain: Damian Travers for Harry. He's the first person to openly antagonise Harry after the latter is sorted into Slytherin. This lasts all of a few months until Harry easily defeats Damian after the latter starts a fight with him.
  • Time Travel: Both Hermione Granger and Harry Potter get a time turner at the beginning of Book 3. They are the first two students to use them, and are being used as trial runs by the Ministry of Magic to see if they are something they could implement in future years. Hermione uses it for the same reasons as canon. Harry uses it to take one extra elective (Divination), and also to further his own more personal goals.
  • Wham Episode:
    • Book 1 - Chapter 13 ends with Harry being given a Portkey which takes him to Nurmengard, where he meets Gellert Grindelwald.
    • Book 2 - Chapter 17 has Harry finally snap after months of physical and mental abuse, resulting in him killing the lamb in his detention with Aberforth, destroying Cadmus Yaxley after the boy starts a fight with him, and revealing himself as a parselmouth in the Slytherin common room.
    • Book 2 - Chapter 27 reveals that Flora and Hestia Carrow where the ones writing in Tom Riddle's diary, has Ron accidentally murder Luna Lovegood with the Sword of Gryffindor, and then has Draco Malfoy destroy the diary with said sword.
    • Book 3 - Chapter 26 ends with both Harry using the killing curse on Sirius, and Voldemort releasing all his followers from Azkaban before proceeding to destroy the prison.
  • You Said You Would Let Them Go: Harry asks Draco to let Neville and Hermione successfully smuggle the dragon out of Hogwarts so as to not get Hagrid into trouble. Draco tells Harry he won't go through with his plan... Hard cut to the very next scene in which Hagrid gets arrested by the aurors thanks to Draco's tip-off. Harry is understandably upset when he finds out.