Vol. 4The Diadem and the Boundary

Sean defeated the Basilisk, uncovered Voldemort’s Horcruxes, and traveled to Ilvermorny as his ties to Hogwarts and its magical creatures grew. After destroying Ravenclaw’s Diadem and meeting Rowena beyond the Veil, he left Helena grieving over her mother’s message.

  • Sean defeated the Basilisk, helped Harry, Ron, and Hermione clear Hagrid’s name, and secretly kept the creature in the Forbidden Forest.
  • Sean hired Remus Lupin to manage Green’s Bookshop and considered how to draw Voldemort into The Boundary.
  • Sean learned more about Voldemort’s history while Harry found resolve through the Black Cat and a fragment of Voldemort’s soul vanished.
  • Sean traveled with Professor Terra to Ilvermorny, where all four House statues responded to him.
  • Sean chose Horned Serpent House at Ilvermorny, learned from Newt Scamander, and built habitats for Ifa and Will.
  • Back at Hogwarts, he found Ravenclaw’s Diadem, explained Horcruxes to Justin, and began searching for the Grey Lady.
  • Sean destroyed the Diadem and met Rowena Ravenclaw beyond the Veil, learning she did not resent Helena.
  • Sean delivered Rowena’s message, but Helena drifted away in grief as he silently followed her.
Chapters 303–402 Read from ch. 303

Arc 13The Basilisk and the Bookshop

Sean defeated the Basilisk and helped Harry, Ron, and Hermione uncover Tom Riddle’s diary and clear Hagrid’s name. As Hogwarts moved on from the Chamber of Secrets, Sean hired Lupin to manage Green’s Bookshop and prepared for the Dueling Club while considering how to draw Voldemort into The Boundary.

  • Sean found Luna alone by the Black Lake, helped her recover her missing belongings, and continued preparing to face the Basilisk.
  • Sean entered the Chamber of Secrets and fought the Basilisk with Transfiguration, summoned Three-headed Dogs, and the Sword of Gryffindor, leaving it weakened but alive.
  • Sean told Dumbledore he had acted to protect others, then secretly kept the Basilisk in the Forbidden Forest while Harry, Ron, and Hermione investigated the Chamber.
  • Harry and Ron entered the Chamber with Riddle’s diary, and Harry stabbed it with a Basilisk fang before Sean arrived and revealed he was alive and had defeated the Basilisk.
  • Sean found evidence that Hagrid had been framed, studied Godelot’s account of dark magic, and later used the Basilisk to drive off Aragog’s Acromantulas.
  • Sean hired Remus John Lupin as acting shopkeeper of Green’s Bookshop, accepting his lycanthropy and arranging his pay and lodging.
  • Dobby admitted he had interfered with Harry’s journey to Hogwarts, while Sean received the Sword of Gryffindor and explained the Chamber plot to Professor McGonagall.
  • Sean considered using Soul Transfiguration to draw Voldemort into The Boundary, then waited for Harry outside the Dungeon after Snape kept him behind.
Chapters 303–327 Summaries Read

Arc 14The Wampus Cat’s Call

Sean uncovered more of Voldemort’s history while Harry found peace with his connection to the Castle Spirit Cat, and the students gathered evidence against Lockhart. At Christmas, Sean traveled with Professor Terra to Ilvermorny, where all four House statues responded to him.

  • Sean told Snape how he had found and defeated the Basilisk, then helped Harry deal with the suspicion his Parseltongue had raised.
  • At the dueling event, Sean defeated Flint, and Snape’s duel with Lockhart ended with Lockhart sent to the Hospital Wing.
  • Dumbledore showed Sean memories of young Tom Riddle, while Harry rejected the idea that his Slytherin traits defined him and found resolve through the Black Cat.
  • Harry encountered a fragment of Voldemort’s soul in the misty realm, and it chose to vanish, destroying one of Voldemort’s Horcruxes.
  • Sean and Justin befriended Lupin, gave him Wolfsbane Potion, and showed him the Marauder’s Map, which revealed the names Moony, Wormtail, Padfoot, and Prongs.
  • Hermione, Justin, and their friends learned that Lockhart had stolen other wizards’ achievements with Memory Charms and considered using The Quibbler to expose him.
  • Sean celebrated Christmas at Hogwarts, then left with Professor Terra for Ilvermorny, where the Horned Serpent, Wampus Cat, Thunderbird, and Pukwudgie all responded to him.
Chapters 328–352 Summaries Read

Arc 15Ilvermorny and the Diadem

Sean chose Horned Serpent House at Ilvermorny, learned from Newt Scamander, and built a magical habitat for Ifa and Will. Back at Hogwarts, he uncovered Mr. Owl’s connection to Ravenclaw’s Diadem, told Justin and Hermione about Voldemort’s Horcruxes, and began searching for the Grey Lady.

  • Sean chose Horned Serpent House, met Lady Isolde Serl, and agreed to help her perform a ritual that would let her leave the school.
  • Sean studied Fantastic Beasts with Newt Scamander, learned Spatial Charms, and earned a Wampus Cat’s trust before naming her Ifa and bringing her into his Wizard Book.
  • Lady Isolde performed the Resting Ritual and faded away, while William swore loyalty to Sean and joined him in developing the Wizard Book’s habitats.
  • Sean left Ilvermorny with Newt and Professor Terra, visited Fairy Tale Workshop, and discussed magical creatures’ intelligence and the origins of their magic.
  • Sean practiced resisting Legilimency with Professor Quirrell and recalled Mr. Owl, whose Confundus Charm had made him forget Ravenclaw’s Diadem.
  • Sean found the Diadem in the Room of Requirement and explained Horcruxes to Justin, who resolved to stand with him against Voldemort.
  • Sean sealed the Diadem in a stone box, then joined Justin and Hermione in searching Hogwarts for the Grey Lady.
Chapters 353–377 Summaries Read

Arc 16The Ravenclaw Reunion

Sean destroyed Ravenclaw’s Diadem and met Rowena Ravenclaw beyond the Veil, hoping to help Helena find peace. Meanwhile, his studies and role at Hogwarts expanded, and Helena was left grieving after hearing her mother’s message.

  • Sean persuaded Helena Ravenclaw to reveal where she had hidden the Diadem, then destroyed the Horcrux and freed its soul fragment.
  • Sean explored the Boundary, met Lady Isolde Serl, and learned that she had encountered Rowena Ravenclaw.
  • Sean visited the McGonagalls for Christmas, sparred with Marcus, and received an untraceable wand and a protected home’s Portkey.
  • After Hagrid was exonerated, Sean agreed to become Care of Magical Creatures Teaching Assistant and help manage the Forbidden Forest.
  • Sean earned three hundred Ravenclaw points for defeating the Basilisk, while Hermione and Justin prepared to capture Lockhart and question him with Truth Serum.
  • Sean developed his Wampus Cat Animagus form and learned more about the Pukwudgies, Lady Isolde, and the Castle Spirit Cat Club.
  • Following Lady Isolde’s thread through the Boundary, Sean met Rowena Ravenclaw and learned that she did not resent Helena and would answer his questions.
  • Sean told Helena that Rowena acknowledged her, but Helena initially rejected the message and drifted away in grief as Sean silently followed her for hours.
Chapters 378–402 Summaries Read
Volume 4 of 6