Chapter Summaries

Gormlaith tempted Sean with the promise of immortality and taught him the Horcrux Creation Spell in exchange for helping her seize Hogwarts. Sean suspected she planned to kill him afterward, but his system revealed that he had already learned the spell at maximum proficiency.

• Gormlaith described splitting a soul and preserving its pieces in indestructible vessels as a path to immortality.
• Sean considered whether the Basilisk guarded Slytherin, a treasure, or the Horcrux method rather than serving to purge Muggle-born students.
• Sean reluctantly agreed to help Gormlaith in exchange for the promised immortality knowledge.
• Gormlaith recited the Horcrux Creation Spell, and Sean's system registered it at maximum proficiency.
• Gormlaith warned Sean not to attempt the spell before mastering it, while Sean secretly realized he had already learned it.

Sean pretended to cooperate with Gormlaith’s plan to lure professors into Basilisk ambushes while extracting spells and information from her. After learning the Parseltongue key to a hidden Slytherin treasure, Sean prepared to turn against her as she moved to ensure his silence.

• Sean raised practical concerns about luring professors, so Gormlaith taught him the Mist Phantom Charm, Sleeping Curse, and Shadow Worm Charm to help signal her.
• Gormlaith taught Sean Parseltongue syllables, and his system showed that he could learn the bloodline talent despite her claim that he could not.
• Gormlaith revealed that the syllables opened a passage to a treasure hidden behind a stained-glass window in the Slytherin Common Room.
• After Sean memorized the longer Parseltongue phrase, Gormlaith approached him with her black arm turning into gauze-like particles, and Sean decided it was time to strike back.

Sean let Gormlaith Gaunt believe her Obscurus safeguard was taking hold, then attacked her before she could summon help. He left Gormlaith unconscious and her dark magic weakened and unstable.

• Gormlaith infused Sean with black particles and threatened to kill him if he revealed her plans.
• Sean pretended to see Slytherin behind Gormlaith, then struck her with a Stinging Hex.
• Dave attacked Gormlaith while the Obscurus inside Sean restrained and devoured her dark power.
• Gormlaith tried to flee by turning ghostly, but Sean used Nihilo Intuor to freeze her in place.
• Sean hit Gormlaith with several more Stinging Hexes until she lost consciousness.

Sean defeated Gormlaith, devoured the dark power she controlled, and secretly confined her in his ring. He then misled the professors about capturing her while guiding them toward the Chamber of Secrets, and Ravenclaw received a net gain of thirty points.

• Sean confirmed that the Obscurus had devoured Gormlaith's dark power and used Pudding to fan her unconscious ghost into his ring for safekeeping.
• Sean left the washroom, where Gormlaith had snapped a rooster's neck, and met Professor Scamander, Professor McGonagall, and Professor Flitwick.
• Sean claimed he had followed an unfamiliar Gaunt ghost to the second-floor girls' washroom and heard her speaking Parseltongue before she disappeared.
• Sean's account led the professors to suspect that he had discovered the entrance to the Chamber of Secrets.
• Professor Flitwick deducted twenty points from Ravenclaw for Sean's rule-breaking, and Professor McGonagall awarded the house fifty points for his courage and quick thinking.

Sean helped the professors prepare safeguards against the Basilisk, then Dumbledore returned to Hogwarts and promised to resolve the danger. Three evenings later, Flitwick told Sean that Dumbledore had entered the Chamber of Secrets.

• Sean urged the professors to seal the Chamber entrance, question Moaning Myrtle, and take precautions against the Basilisk’s gaze.
• Sean described an elaborate plan involving evacuation, poison, roosters, explosives, Aurors, and tanks, alarming the professors.
• Dumbledore returned to Hogwarts during dinner and promised the students that the crisis would soon be resolved.
• On the third evening, Flitwick sent Sean a note saying that Dumbledore had entered the Chamber of Secrets.

After Dumbledore defeated the Basilisk and Hogwarts lifted its restrictions, Sean took advantage of the crowd to enter the Slytherin Common Room and uncover a hidden passage beneath a portrait of Slytherin. He and Dave descended to a chamber by the Black Lake, where a huge creature appeared as Sean looked into its yellow eyes.

• Terry Boot woke Sean and told him that Dumbledore had defeated the Basilisk, whose corpse was displayed on the grounds.
• Professor McGonagall announced that the restrictions, including the Forbidden Forest rules, had been lifted, and Sean realized the Common Rooms would be empty.
• Sean disguised himself as a Slytherin and used Dave to get the password before entering the vacant Slytherin Common Room.
• Sean spoke Parseltongue to open a hidden passage behind a stained-glass portrait of Slytherin and decided to explore it with Dave.
• Sean reached a chamber beneath the Black Lake, where Dave warned him as a huge head emerged from an opening and Sean saw its yellow eyes.

Sean was overwhelmed by a Basilisk in the Chamber of Secrets and lost consciousness as Dave shrieked in grief. Meanwhile, Dumbledore and Grindelwald discussed awakening Ancients and Sean’s disappearance, then prepared to investigate the Chamber.

• Sean saw enormous orange-yellow eyes, dropped his wand, and fell unconscious as a creature burst through the water.
• Grindelwald warned Dumbledore that dangerous Ancients were awakening and treated the decaying curse on Dumbledore’s hand with a potion.
• Dumbledore and Grindelwald argued over whether awakened Ancients could be reasoned with or should be erased.
• Professor McGonagall reported that Sean was missing after Hermione had been unable to find him all day.
• Grindelwald guessed Sean had gone to the Chamber of Secrets and offered to help Dumbledore enter it.

Sean went missing after Dumbledore and Grindelwald found he had not entered the Chamber of Secrets, and Hogwarts searched for him without success. As students learned the news and feared for his safety, Malfoy privately worried about Sean while pretending to share the Slytherins’ laughter.

• Dumbledore and Grindelwald searched the Chamber of Secrets, but Dumbledore found that Sean had not gone down there.
• Dumbledore searched the castle and sent McGonagall, Hagrid, and the Weasley twins to search the grounds, but no one found Sean.
• Hermione and Daisy noticed Sean’s absence, and Professor Flitwick eventually told them that Sean had gone missing.
• News spread through Hogwarts, where students worried about Sean while Slytherins mocked his disappearance.
• Malfoy disliked Crabbe and Goyle’s celebration and privately wondered how Sean could have disappeared without a trace.

Sean awoke in the Stone Chamber after surviving the Basilisk’s gaze, and learned that the Basilisk had brought a magical skull that helped stabilize him. As Sean considered whether Pride had protected him, the Basilisk returned with its eyes closed.

• Sean summoned Unicorn's Favor and slowly regained consciousness while Dave confirmed that he was alive and the Basilisk was outside.
• Dave told Sean that the Basilisk had endured his attacks, then returned with a glowing canine skull whose fire entered Sean and steadied his presence.
• Sean reasoned that Pride might have made him resistant to the Basilisk’s deadly gaze, but remained unsure why the Basilisk had tried to save him.
• The Basilisk returned to the Stone Chamber, and Dave told Sean that it had closed its eyes.

Sean recovered in the Stone Chamber after a week, with Dave explaining that the Basilisk had kept him alive by feeding him fish blood. As Sean examined the chamber, he found Salazar Slytherin’s writings, which revealed that Slytherin had believed in pure-blood superiority but had not intended for his descendants to kill Hogwarts students of lesser blood.

• Sean questioned whether the Basilisk was truly friendly, then saw its badly wounded body and learned Dave had injured it while protecting him.
• Dave explained that magic had sealed the way out and that the Basilisk had thrown him fish each day, which he used to keep Sean alive.
• Unicorn’s Favor healed Sean’s injuries, and he recovered enough strength to sit up and search the Stone Chamber with the Phoenix Feather ready.
• Sean found a bundle of parchment sheets on a table and checked for harmful magic before reading them.
• Sean read Slytherin’s writings and learned that Slytherin had wanted his descendants to remove impure-blooded wizards from Hogwarts, but to spare their lives.

Sean read Salazar Slytherin’s notes in the Stone Chamber, learning about the Basilisk, Slytherin’s ideals, and powerful ancient spells. He took the magical insights with him, still puzzled by the motionless Basilisk left in the chamber.

• Sean read Slytherin’s warning that his descendants could summon the Basilisk but must never use it to kill.
• Sean considered how Slytherin’s ideas about Wizarding supremacy compared with Riddle’s and Grindelwald’s.
• Sean studied Slytherin’s notes on ancient spells and learned that an old Scouring Charm had appeared on his system panel without being classified as Dark Arts.
• Sean read Slytherin’s explanation of Legilimency, including its limits and the need to interpret the memories it revealed.
• Sean took Slytherin’s magical insights and wondered what was happening with the Basilisk in the chamber.

Sean explored the Stone Chamber and found Slytherin’s detailed research on Basilisks, including how to hatch them and the lethal effects of their venom and gaze. The notes revealed that Slytherin had bred seventeen Basilisks, while Sean was left to wonder what had happened to them.

• Sean questioned why Slytherin had left a Basilisk in the Stone Chamber and why his notes had not mentioned it.
• Sean found a parchment titled “Research and Communication on Basilisk Habits” among the chamber’s old supplies.
• Sean read Slytherin’s instructions for hatching and raising Basilisks, which recorded that he had hatched seventeen of them.
• Sean read Slytherin’s findings on Basilisk venom and learned that its gaze could kill, with reflected eye contact causing petrification instead.

Sean read Slytherin’s records on Basilisks and Parseltongue, then uncovered a hidden chamber containing three skeletons and the belongings of Ales Lockhart, a memory-magic expert who had returned to Hogwarts seeking Slytherin’s treasure. The notebook revealed that Ales had stolen a Gaunt’s memories to learn Parseltongue, but his memory manipulation had damaged his sense of identity.

• Sean read that Basilisks could heal rapidly, that Slytherin’s attempts to breed them had produced one unhatched egg, and that the Basilisks he raised had limited intelligence.
• Sean learned from Slytherin’s notes that Parseltongue was language magic and could be learned, despite Slytherin’s warning that his descendants should not display it openly.
• Sean found a carved snake at the base of a stone wall, spoke Parseltongue from the corridor, and opened a concealed room without triggering a trap.
• Sean searched the room and found three skeletons, a preserved notebook, and a crystal vial containing drifting silvery wisps.
• Sean read Ales Lockhart’s notebook and learned that the Ravenclaw alumnus had mastered memory magic, stolen memories from a Gaunt to learn Parseltongue, and returned to Hogwarts for Slytherin’s treasure.

Sean discovered Ales’s notebook and learned more Parseltongue before opening Slytherin’s chest and hearing his message. As Gormlaith Gaunt reappeared beside him, the Basilisk rushed back into the chamber.

• Sean read Ales’s account of his memory experiments and used the notebook’s Parseltongue guide to improve his skill.
• Sean opened the chest after its loose plank fell, revealing a projection of Salazar Slytherin and three gifts, including a memory and a Horned Serpent gem.
• Sean realized the Basilisk might have hatched naturally from an egg Slytherin had left behind and suspected the Pensieve had killed the skeletons nearby.
• Gormlaith Gaunt reappeared after Nihilo Intuor wore off, and the Basilisk shot back into the chamber when she hissed.

Sean discovered that the Basilisk was friendly toward him and had petrified Gormlaith, then learned about its history and tested whether Slytherin's Pensieve was safe. He entered it and found Salazar Slytherin demonstrating Ancient Spells before revealing that Hogwarts itself was a powerful Magical Item whose authority could be claimed.

• Sean fled from the Basilisk, but it attacked Gormlaith instead and petrified her after recognizing Sean as safe.
• Sean used Dave to communicate with the Basilisk and learned that its master had ordered it to attack Parseltongue speakers and that it had hidden the bodies of three victims.
• Sean tested the Sneakoscope and Unstable Coin, concluded that the Pensieve was safe, and plunged into it.
• Sean arrived in the Chamber of Secrets and watched Salazar Slytherin demonstrate more than a dozen Ancient Spells, which Sean barely learned.
• Slytherin called control over Hogwarts Castle his final gift and began explaining how to gain authority over the castle.

Sean learned that Hogwarts’ founders had hidden four magical imprints whose recognition could grant someone authority over the castle, then returned from the Pensieve with Slytherin’s instructions and left the Basilisk in the Chamber of Secrets. While Hogwarts’ professors worried over Sean’s weeklong disappearance, Dumbledore and Grindelwald watched an image of Sean unconscious and injured in a crystal ball.

• Slytherin told Sean that the founders had each imprinted an area of Hogwarts, and that finding and gaining recognition from all four would make someone master of the castle.
• Slytherin revealed that his imprint was in the Chamber of Secrets and explained that Sean would need to pass a test and use Runes to merge and cleanse magic to gain his authority.
• Sean returned from the Pensieve, regretted that he could not continue studying the Ancient Magic, and agreed to leave the Basilisk in the Chamber until he could decide what to do with it.
• Sean changed into a fresh uniform and considered how to explain his disappearance as the professors discussed his absence and their concern for his family and friends.
• In Newmontgard Castle, Grindelwald and Dumbledore watched a crystal-ball image of Sean lying unconscious with blood on his face, and Grindelwald said he was furious.

After Grindelwald foresaw Sean bloodied and in danger, he decided to search for the people he suspected were behind the attack, despite Dumbledore’s warning. Meanwhile, Sean emerged from the Stone Chamber and headed toward the professors’ offices, preparing to explain his disappearance.

• Grindelwald and Dumbledore argued over a vision of Sean injured and a hooded man, and Grindelwald resolved to investigate the ancient families.
• Grindelwald appeared in Greece, entered Vlahos’s home, and immobilized Vlahos’s House-elf.
• Grindelwald revealed that Vlahos descended from the Seer Mopsus and demanded that he take him to the other ancient families, even if it cost Vlahos his life.
• Sean left the Stone Chamber after midnight and headed toward the professors’ offices, unsure how to explain what had happened.

After returning to Hogwarts, Sean told Dumbledore about the strange world he had entered, and Dumbledore suggested that Pride might be another soul connected to the Realm of Illusion. Sean then reunited with Hermione and Daisy, who had been searching for him.

• Sean met Professors McGonagall, Flitwick, and Scamander in the castle, and they took him to the Hospital Wing for an examination.
• Dumbledore examined Sean and privately asked him what had happened while he was missing.
• Sean described a Sky Island above a vast lava-covered land, and Dumbledore proposed that it was his part of the Realm of Illusion.
• Dumbledore suggested that Pride might be another soul, then left to address serious misunderstandings caused by Sean's disappearance.
• Sean went to Ravenclaw Tower and found Hermione and Daisy searching for him; he answered the Common Room riddle, and they joyfully greeted him.

Sean returned to Hogwarts after being missing for several days, reunited with his friends, and received an enthusiastic welcome from the students. At the Room of Requirement, he and Daisy discovered a scorched parchment listing Hogwarts’ secret rooms and ways to enter them.

• Hermione and Daisy told Sean how they had searched for him, and the three shared dinner after House-elf Cornish delivered it.
• Stephanie secretly watched Sean with Hermione and Daisy while holding a list of Hogwarts’ secret rooms, then hesitated to burn it and returned to the dormitory.
• Sean’s roommates and Hogwarts students celebrated his return, while Malfoy privately looked forward to confronting him again.
• Professor McGonagall awarded Ravenclaw twenty points after Sean easily turned a rabbit into house slippers.
• Sean brought Hermione and Daisy to the Room of Requirement, where Daisy found a scorched parchment titled “A List of Hogwarts' Secret Rooms and Known Ways to Enter Them.”

Sean introduced Daisy to his magical creatures and demonstrated his Transfiguration skill, convincing Hermione and Daisy to learn Animagus transformation with him. By mid-December, the three were practicing together, and Sean began the Mandrake-leaf stage on a full-moon night.

• Sean showed Hermione and Daisy a parchment listing secret Hogwarts locations, but warned them not to explore its unknown places.
• Sean introduced Daisy to his magical creatures, and she quickly bonded with Pudding and helped feed the animals.
• Sean turned a dusty teapot into a turtle, impressing Hermione and easing some of her concerns about his Transfiguration ability.
• Daisy asked to learn Animagus transformation, and Hermione agreed to join so she could supervise Sean and Daisy.
• Sean explained the Animagus method to Hermione and Daisy, and Daisy misunderstood the jade-piece practice before Sean realized his piece might have belonged to Dumbledore.
• On a full-moon night in mid-December, Sean put a Mandrake leaf in his mouth as Hermione and Daisy watched.