Chapter Summaries

Vaughn refined the plan for Wolfsbane Potion 2.0, using the werewolf virus’s transformation framework as his target. Meanwhile, Lupin watched the North American werewolf protests escalate and read an editorial accusing them of being an obedience test.

• Vaughn concluded that the full moon activated the werewolf virus’s protective lock, preventing him from suppressing its replication during the ritual.
• Hermione encouraged Vaughn to pursue Wolfsbane Potion 2.0’s revised goal of preventing werewolf transformations, and she checked the medicinal materials he had selected.
• Vaughn used the Spell Development Module to design a potion that would disrupt the virus’s transformation framework by inducing the body’s own mutations, with gerbera as the main ingredient.
• Lupin woke to find the North American werewolves’ assigned buildings empty because the protesters had spread across wizarding communities in England.
• Lupin read an editorial that described the protests as a deliberate obedience test intended to desensitize wizards and push their boundaries.

After reading an article accusing the North American Werewolf Protest Movement of being an Obedience Test, Lupin feared that Vaughn might have orchestrated the protests and the deaths that preceded them. He went to meet Vaughn at the Shrieking Shack, where he heard a girl’s voice from the room he was told to enter.

• Lupin reflected that Vaughn had gradually reshaped his beliefs by showing him the real suffering of werewolves, and wondered whether Vaughn had arranged the North American protests and the killings of two werewolves.
• Lupin left to investigate the protests, but Matthew found him and said Vaughn had summoned him to the Whomping Willow to discuss the Wolfsbane Potion.
• Lupin traveled with Matthew through a disguised Public Floo to Hogsmeade, where Matthew asked whether returning to the castle was a path they should choose.
• Lupin walked to the Shrieking Shack and remembered the full-moon nights he had spent there with James, Sirius, Peter, and the Prewett brothers.
• Fred and George recognized Lupin, told him Vaughn was waiting upstairs, and sent him to the first room on the left.
• Lupin knocked on the room’s door, and a girl’s voice told him to come in.

Vaughn brewed and tested the Second Edition Wolfsbane Potion on Lupin, and it prevented him from transforming under the Magic Moon despite causing severe pain. Vaughn and Hermione began planning improvements while Lupin recovered in the Suitcase Space.

• Lupin arrived at Vaughn’s brewing room, where Hermione was preparing to record the Second Edition Wolfsbane Potion experiment.
• Vaughn explained the potion’s ingredients and rituals as he brewed it, and Hermione recorded his process.
• Vaughn gave Lupin the potion, then summoned the Magic Moon to force a transformation; Lupin fainted from pain but did not turn into a werewolf.
• Vaughn and Hermione concluded that the potion had mostly succeeded and discussed adjustments to reduce its painful effects.
• Vaughn left Lupin to recover in the Suitcase Space, while Hermione returned to the castle to face her growing homework load.

Vaughn documented his theories about magical ingredients and Fluxweed while modifying the Wolfsbane Potion with Lupin, then paused the trials when Lupin’s condition worsened. Hogwarts approved Vaughn’s Duelling Club after Dumbledore intervened, and Harry considered joining as his friendships with Ron and Hermione remained strained and Colin Creevey’s absence unsettled him.

• Vaughn recorded theories about Traits, medicinal properties, Magic, and Fluxweed, raising Fluxweed’s research priority and planning another experiment.
• Vaughn continued testing Wolfsbane Potion 2.0 with Lupin until Monday, when he suspended the trials because Lupin suffered severe side effects.
• Dumbledore returned to Hogwarts and persuaded the governors to approve Vaughn’s Duelling Club, whose announcement invited students and professors to join.
• Harry read the notice with Ron and Neville; Neville admitted he feared failing to benefit from Vaughn’s guidance and left the crowd.
• Harry noticed Colin Creevey was absent, while Ron dismissed his concern and explained that Vaughn knew many spells, including Apparition.
• Harry reflected on his damaged friendship with Hermione and his plan to become stronger before dealing with the dangerous Notebook Creevey had taken.

Harry worried that Ron had developed feelings for Hermione while the Golden Trio drifted apart, as rain battered Hogwarts and the students prepared to join the Duelling Club. After Nearly Headless Nick mentioned an evil Notebook, Harry and Ron suspected Peeves had it and planned to recruit ghosts to find it, while Vaughn entered their dormitory at night.

• Harry noticed Ron staring lovestruck at Hermione and worried about the effect on their friendship and Hermione’s relationship with Vaughn.
• Weeks of heavy rain flooded the grounds, while Oliver Wood continued Quidditch training and Hagrid celebrated his giant pumpkins grown from seeds and fertilizer sent by Vaughn and Rosier.
• Neville told Harry and Ron that Duelling Club registration had opened, and the crowded line included several ghosts as well as students.
• Peeves soaked the queue with water balloons, and Harry and Ron overheard Nearly Headless Nick mutter about an evil Notebook.
• Harry and Ron suspected Peeves had found Harry’s lost Notebook and decided to ask ghosts to watch Peeves and Colin Creevey, while agreeing to seek Vaughn or Dumbledore’s help if necessary.
• After Harry and Ron fell asleep, Vaughn entered their dormitory with his Wand and a red magical Aura swept over the beds.

Vaughn examined Harry’s memories and warned Dumbledore that an unknown force had affected Harry’s mind. After Vaughn and Dumbledore stopped the attacker from reaching the Chamber of Secrets, Dumbledore revealed a plan to use a Music Box to record Parseltongue and open the entrance.

• Vaughn extracted Harry’s Persona Armor and found signs that an unknown force had triggered Harry’s inner defenses, while Dumbledore argued against intervening too deeply.
• Dumbledore told Vaughn that the castle had sensed an evil force stirring, and they went to investigate the attack on Mrs. Norris.
• Vaughn illuminated the dark corridor and protected Filch as Mrs. Norris was found injured; Dumbledore sent Filch to the Hospital Wing.
• Vaughn picked up Filch’s Quick-Spell book and identified it as a scam before he and Dumbledore examined the entrance to the Chamber of Secrets.
• Dumbledore explained that he had found the hidden snake-marked tap and used a Music Box to reproduce recorded Parseltongue, opening the Chamber’s entrance.

Vaughn and Dumbledore entered the Chamber of Secrets, where they found no trace of Slytherin’s inheritance or the Basilisk. Dumbledore explained that he was investigating whether Slytherin built the Chamber for a purpose other than exterminating Muggle-born students, and began considering what the Founders’ choices meant in the context of their era.

• Vaughn questioned Dumbledore’s reason for bringing him into the Chamber, and Dumbledore led him down the entrance pipe before promising to explain.
• Vaughn and Dumbledore followed a deep, damp tunnel to the Chamber’s snake-carved entrance, which Dumbledore opened with the Music Box.
• They explored the vast chamber and found it empty of furnishings, leaving Dumbledore’s hope of discovering Slytherin’s knowledge of Horcruxes unfulfilled.
• At the far end, Vaughn suspected the Basilisk was inside a giant statue and pressed Dumbledore to reveal his plan.
• Dumbledore discussed the dangers wizards faced in the tenth century and proposed that Slytherin’s opposition to Muggle-born students may have been driven by fear of Hogwarts being exposed.
• Vaughn said Slytherin might have been a realist shaped by his era while still being narrow-minded, and Dumbledore began comparing the Founders’ views against their historical circumstances.

Dumbledore argued that Salazar Slytherin may have left a Horcrux and a means of resurrection in the Chamber of Secrets, and that the Notebook’s fragment of Tom Riddle might be trying to revive him for protection. Vaughn accepted the theory as plausible but proposed examining Morfin Gaunt’s memories, while Dumbledore warned that another visit could kill him.

• Dumbledore illuminated the Chamber and suggested Slytherin’s conflict with the other Founders might have been a disagreement shaped by their era, not a plan to slaughter Muggle-borns.
• Vaughn realized the chamber might be a palace built for Slytherin’s resurrection and proposed that the basilisk could be Slytherin’s Horcrux.
• Dumbledore reasoned that the Notebook’s Tom might be reopening the chamber to gain Slytherin’s protection and fulfill a plan for resurrection.
• Vaughn reconsidered why Voldemort had entrusted the Notebook to Lucius Malfoy and accepted that Dumbledore’s theory was plausible despite its unanswered questions.
• Dumbledore explained that the Music Box could not communicate with the basilisk, and Vaughn suggested killing it to examine its soul; Dumbledore objected that this might destroy Slytherin.
• Vaughn proposed returning to Azkaban to inspect Morfin Gaunt’s memories, but Dumbledore warned that Morfin might not survive another visit.

Vaughn agreed to help Dumbledore monitor Tom’s Notebook and protect Colin Creevey, while warning him against trying to revive Slytherin. He retrieved and activated the Marauder’s Map, discovering Peter Pettigrew beside Harry and Ron and finding Peeves with Colin in a secret passage.

• Vaughn gave Dumbledore a magical mist that could help him sense the Notebook and advised him to lure Colin Creevey into the Duelling Club to protect him.
• Vaughn warned Dumbledore not to pursue the idea of reviving Slytherin to solve Harry’s Horcrux problem, then left the Chamber of Secrets with Guoguo Tea.
• Vaughn visited Mrs. Norris in the Hospital Wing and asked Filch to retrieve a folded parchment from his office.
• Vaughn activated the Marauder’s Map and saw Peter Pettigrew’s name beside a mouse footprint near Harry and Ron.
• Vaughn found Peeves and Colin Creevey together in a secret passage on the fourth floor.

Harry, Ron, and Hermione attended the opening of Vaughn’s Duelling Club, which drew a large crowd of students and professors. As the event began, Harry noticed Snape watching him, recalling the humiliating Potions lesson he and Ron had just endured.

• Vaughn sensed that the Notebook’s soul fragment was keeping a low profile, leaving Dumbledore’s plans at a standstill, while he prepared for the Duelling Club and studied Alchemy.
• Malfoy showed up at the Quidditch Pitch with the Slytherin Team and their new Nimbus 2001 brooms, then his teammates beat up the Gryffindor players.
• Harry, Ron, and Hermione began spending time together again, and the Golden Trio gradually reconciled despite their unresolved tensions.
• Harry, Ron, and Hermione hurried to the Duelling Club’s first event, where Percy welcomed them and arranged a good place for them in the crowded Training Ground.
• Harry saw several professors at the event, including Snape, and remembered how Snape had made him and Ron fail their latest Potions lesson.

At the Duelling Club’s first event, Vaughn used a recreated battle from North America to show Hogwarts students the dangers of a world that was not truly at peace and explained the purpose of practical combat training. He then began outlining the importance of magic and spells, leaving the crowd listening as the presentation continued.

• Harry and Ron spoke with Colin Creevey, whose exhausted appearance and strained denial strengthened Hermione and Ron’s suspicion that the bewitched Notebook was controlling him.
• Hermione pressed Harry and Ron to plan how to retrieve the Notebook, but she forgot the conversation when Vaughn arrived with Professor Isabella Rosier.
• Vaughn opened the Duelling Club event by declaring that the Wizarding world had never been at peace, then recreated a North American battle in the Training Ground with the Mist Charm.
• The students watched the memory’s spells and Killing Curse in fear, and Vaughn told them that practical classes were meant to make them confront the cruel dangers of the world.
• Vaughn introduced plans for gathering and sharing information, then asked what mattered most to a wizard; Fred and George answered magic, and Vaughn began explaining the power of wands and spells.

Vaughn explained how Ancient Magic depended on demanding rituals and celestial events, then demonstrated how a basic Lumos Charm could be developed into a spectacular display through the caster’s growing skill. He challenged students to face him together using powerful spells while he used only basic Magic, and the duel began with opponents attacking him.

• Vaughn described the Animagus ritual as an example of the difficulty of Ancient Magic and argued that a wizard’s strength, rather than a spell’s reputation, determined its power.
• Vaughn transformed Lumos into shifting, expanding, splitting, and flowing lights before explaining that his Magic had grown through years of practice.
• Vaughn invited students to choose duelists who could use their strongest spells against his third-year-level Magic, and six students, including Draco and Cedric, stepped forward.
• Vaughn told the six challengers to attack him together, and the Ravenclaw sixth-year opened with Deprimo, collapsing the ground beneath him.
• Vaughn used Feather Light to drift safely above the trembling ground as a Gryffindor sixth-year summoned a storm cloud filled with lightning.

Vaughn demonstrated how mastery of basic spells could defeat powerful attacks, then assigned Hogwarts students to practice the Levitation Charm as the first step in his Duelling Club training. Harry, Ron, and Hermione later visited Hagrid and discovered his chickens had been killed, leaving Hagrid convinced a student was responsible.

• Vaughn countered the upper-year students’ attacks with basic spells, then knocked out five of the six challengers with a powerful Stunning Charm, leaving Draco Malfoy standing.
• Vaughn explained that the Duelling Club would teach students to uncover the potential of spells they already knew, and assigned them to master the Levitation Charm to Level 2.
• Harry and Ron struggled to keep paper airplanes aloft, while Hermione practiced easily; Harry then suggested they visit Hagrid to clear his head.
• Harry told Hermione and Ron that Vaughn had spoken privately with Colin Creevey, and Hermione wondered whether Vaughn knew about the Notebook.
• Harry, Ron, and Hermione found Hagrid grieving over his dead chickens; Hagrid concluded that a student had killed them, and Hermione suggested poison or magic.

Harry, Ron, and Hermione suspected the Notebook had prompted Colin Creevey to kill Hagrid’s chickens, while Vaughn and Dumbledore used the attack to test Tom’s plans for the Basilisk. As conflict over North American Werewolves intensified, Vaughn promised Amelia progress on the Wolfsbane Potion while secretly admitting he had helped provoke the unrest; Matthew then reflected on his traumatic past and his uncanny impression of Vaughn.

• Hermione and Ron suspected the Notebook had influenced Colin Creevey to poison Hagrid’s chickens, but the trio found no evidence and Hagrid refused to report the deaths to Dumbledore.
• Dumbledore told Vaughn that he had planted an emotional suggestion in Creevey, causing Tom to lower his guard and test whether Vaughn and Dumbledore knew about the Notebook by killing Hagrid’s roosters.
• Vaughn and Dumbledore agreed to wait for Tom to release the Basilisk so they could learn his purpose, while Vaughn discussed the second-edition Wolfsbane Potion and the escalating dispute over North American Werewolves.
• Amelia asked Vaughn to finish the potion to ease tensions between wizards and Werewolves, and Vaughn promised to complete it while concealing that he had helped plan the protest movement.
• Vaughn decided that he needed to restrain the North American Werewolves’ ambitious leaders, then Matthew woke from a nightmare and reflected on his trauma, his hatred of Lycanthropy, and his impression of Vaughn.

Matthew received a message from Vaughn Weasley declaring the North American Werewolf Separatists expendable, while John Mil negotiated with a secret faction to provoke a bloody clash and dismantle WAC. The conspirators agreed to support John’s plan, but Mister Mysterious remained wary of Vaughn and the suspicious deaths of the first two Werewolves.

• Matthew read a note from Vaughn Weasley and concluded that his new master intended to abandon the North American Werewolf Separatists now that their usefulness was ending.
• John Mil reassured the protesting Werewolves, then slipped into Knockturn Alley to meet Mister Mysterious in the basement of Borgin and Burkes.
• John Mil demanded practical support for the Separatists’ needs before he would provoke a violent incident, and Mister Mysterious agreed to negotiate his terms.
• After John Mil left, the conspirators discussed using Dark Wizards and a bounty to eliminate the Werewolves after they helped undermine WAC.
• Mister Mysterious ordered his allies to contact John Mil, while questioning whether Vaughn’s movements were being monitored and whether he had used Memory Magic on the protest leaders.

John Mil learned that Vaughn Weasley’s Second Edition Wolfsbane Potion could suppress full-moon transformations, threatening his hold over the North American Werewolves and his plan to break WAC apart. He hurried to meet the Patrons and revealed the news, leaving their response unknown.

• John Mil returned to the WAC Settlement and learned from Joseph Francois that the Second Edition Wolfsbane Potion could suppress Werewolf transformations during the full moon.
• John Mil realized the potion could restore the Werewolves’ hope of returning to human society and undermine his influence over them.
• John Mil decided to inform the Patrons and seek their help securing his future, then took the Knight Bus back to London.
• John Mil reached Borgin and Burkes, where Mr. Borgin used a Vanishing Cabinet to summon the hidden Patrons.
• Mister Mysterious arrived with the others, and John Mil told them about the potion; the news drew heavy breathing from the other side.

John Mil warned the hooded patrons that the new Wolfsbane Potion could ruin their plans, but Vaughn Weasley ambushed them before they could act. Vaughn held off all five wizards while restraining John, and the patrons decided to break out of the Basement and Apparate separately.

• John Mil told Mister Mysterious that Joseph Francois knew about the new Wolfsbane Potion and said he could mobilize his recruited werewolves if the patrons provided immediate rewards and promises.
• Mr. Borgin went upstairs after shouting was heard, and John noticed a strange wind in the Basement before spotting Vaughn Weasley's Dimension Gate.
• John recognized the Dimension Gate, shouted Vaughn's name, and tried to flee, but Vaughn used Accio and a repulsive force to pull him back and pin him down.
• Vaughn fought the five patrons alone, deflecting their spells with a powerful Shield Charm while continuing to restrain John through wandless, wordless Magic.
• Mister Mysterious concluded that Vaughn had lured them into a trap and ordered the others to escape the Basement and Apparate separately.

Vaughn Weasley pursued John Mil through Apparition after John escaped the Basement with the Patrons, then captured and disarmed him in a dark forest. John gave up resisting and asked whether Vaughn wanted to know why he had betrayed him, but Vaughn said he had no interest in his motives.

• Mister Mysterious and the other Patrons freed John Mil so they could use him to distract Vaughn, and John escaped Vaughn’s control with a self-cast Locomotor spell.
• John Mil attacked Vaughn with a lightning serpent and a Cruciatus Curse, but Vaughn absorbed the lightning and a mouse from his robes took the curse.
• Mister Mysterious led John Mil and the Patrons out of the Basement, then used Borgin’s Potions to restore their emotions as Vaughn extinguished the Fiendfyre and emerged.
• John Mil and the Patrons fled by Apparition, but Vaughn invaded John’s Apparition Corridor and dragged him into a mountain forest.
• John Mil tried another Cruciatus Curse and then reached for his wand, but Vaughn resisted the curse and disarmed him with a sweeping area-wide spell.
• John Mil stopped fighting and asked whether Vaughn wanted to know why he had betrayed him, and Vaughn said he understood that people had motives but was not interested in John’s.

Vaughn revealed how he planned to use John Mil’s betrayal and fabricated testimony to unite the werewolves and sow conflict among their enemies, then broke John’s resolve with Legilimency. In Hogwarts’ practical-class Pocket Dimension, Harry, Ron, and Hermione learned that a furious Serpent Bird had rampaged after someone stole her hatchling and decided to return to camp.

• John Mil confronted Vaughn about his plans for the werewolves, and Vaughn admitted that Francois had always been his agent and had killed Alexander and another man on Vaughn’s orders.
• Vaughn showed John a memory in which John named prominent Wizarding families as his backers, explaining that he would use John’s testimony to make the werewolves unite and turn suspected families against one another.
• John’s will collapsed at Vaughn’s ruthless strategy, and Vaughn used Legilimency on him.
• Harry, Ron, and Hermione emerged from hiding after an angry Serpent Bird tore through the forest, then Hermione fed the Bowtruckles that had sheltered them.
• Ron explained that the Serpent Bird had likely rampaged because someone stole her hatchling, and the three students decided to return to camp so Professor Rosier could investigate.

Harry, Ron, and Hermione returned to camp amid the chaos caused by a missing Serpent Bird chick, then learned from the Daily Prophet that Vaughn had exposed a conspiracy behind the Liverpool murders and demonstrations. At the Wizengamot, Vaughn accused powerful pure-blood families using a list John Mil had confessed to, and the hearing adjourned before Rufus Scrimgeour brought Amelia the interrogation results.

• Harry, Ron, and Hermione returned to camp as Professor Rosier investigated a rampaging Serpent Bird whose chick had been taken by a student.
• The trio discovered Vaughn was away at the Wizengamot and later read Rita Skeeter's report that he had arrested John Mil and uncovered a conspiracy behind the Liverpool murders and the werewolf demonstrations.
• Vaughn presented a list naming sixteen of the Sacred Twenty-Eight at the Wizengamot and accused Old Yaxley and other pure-bloods of being involved.
• Vaughn argued that he had used Legilimency on John Mil to preserve evidence before the suspect could be silenced, while Russell Lestrange reconsidered his opposition.
• Amelia Bones adjourned the heated Wizengamot session, and Rufus Scrimgeour arrived at her office with John Mil's interrogation results.