Chapter Summaries

Vaughn identified the full moon as the trigger for the werewolf virus’s protective lock and used the Spell Development Module to design a new Wolfsbane Potion 2.0 that could disrupt the transformation ritual through the body’s own mutations. Meanwhile, Lupin saw that North American werewolves’ protests had escalated into a political standoff and read an editorial arguing that the demonstrations were an obedience test designed to desensitize the public.

• Vaughn explained to Hermione that the full moon opened the virus’s protective lock, making it impossible to interfere with the virus while its capsid was shed.
• Hermione praised Vaughn’s revised Wolfsbane Potion 2.0 for preventing werewolves from being forcibly transformed, and Vaughn prepared to use the Spell Development Module to advance his design.
• Vaughn analyzed the virus’s embedded curses and transformation ritual, then proposed using gerbera and the body’s natural healing mutations to destroy the ritual framework.
• Lupin woke to find the North American werewolves still protesting across wizarding communities, while their former residence stood empty.
• Lupin reread a newspaper editorial that described the demonstrations as a deliberate compliance test intended to lower the public’s resistance through repeated challenges to its expectations.

Lupin questioned whether Vaughn had shaped his loyalties through an obedience test and worried that an article accusing North American werewolves of manipulation could provoke a backlash. After Matthew brought him to the Shrieking Shack to meet Vaughn, Lupin found the Weasley twins there and heard a girl invite him inside.

• Lupin read an article about obedience tests and wondered whether Vaughn had influenced him by showing him the suffering of werewolf refugees.
• Lupin feared the article could fuel anti-werewolf sentiment and suspected Vaughn might have orchestrated the North American werewolf march and the deaths of two werewolves.
• Matthew told Lupin that Vaughn wanted to see him about the Wolfsbane Potion and directed him to the Whomping Willow.
• Matthew escorted Lupin by Floo to Hogsmeade, then left him to continue toward the Shrieking Shack alone.
• Lupin reached the shack, remembered his school years and the Marauders, and met Fred and George, who said Vaughn was waiting upstairs.
• Lupin knocked on the first room on the second floor, and a girl inside told him to come in.

Vaughn brewed and tested a second version of the Wolfsbane Potion on Lupin, whose severe reaction left him unconscious but untransformed under the magical moon. Vaughn and Hermione judged the experiment partly successful and began planning further adjustments, while Lupin remained in the suitcase to recover for more tests.

• Lupin entered Vaughn’s brewing room and learned that he had been summoned to test the second version of the Wolfsbane Potion, while Hermione prepared to record the experiment.
• Vaughn explained the potion’s ingredients and rituals as he brewed it, then completed a luminous potion designed to disrupt lycanthropy.
• Lupin drank the potion and suffered intense pain before Vaughn raised the magical moon; Lupin lost consciousness but did not transform.
• Hermione recorded Lupin’s reaction, and Vaughn identified the potion as partly successful while discussing ways to improve its formula.
• Vaughn ended the day’s experiments and left Lupin asleep inside the suitcase beneath the magical moon, expecting to continue testing the next day.

While refining Wolfsbane Potion 2.0, Vaughn explored how magic enhanced ingredients’ properties and prioritized Fluxweed for further experiments. Hogwarts approved his Dueling Club, and Harry considered joining for Vaughn’s spell guidance while worrying about Colin Creevey’s absence and the strain on his friendships.

• Vaughn recorded theories about magical ingredients, concluded Fluxweed could reshape living bodies, and planned to make it a major ingredient in a future experiment with Lupin.
• After two days of punishing potion trials left Lupin suffering severe pain and physical changes, Vaughn suspended the experiments so he could recover.
• Dumbledore returned to Hogwarts, and the Board of Governors approved Vaughn’s Dueling Club after disputes over whether it should be a club or a permanent class.
• Harry read the club announcement and wanted to join for spell practice; Neville admitted he feared being too foolish to benefit from Vaughn’s instruction.
• Harry worried that Colin Creevey had been absent, while Ron dismissed the concern and discussed Vaughn’s spell skill and dangerous Apparition magic.

Harry noticed Ron falling for Hermione while the rain and Quidditch training made Hogwarts miserable, then joined Ron in investigating whether Peeves had found Harry’s dangerous lost notebook. The chapter left them planning to enlist Hogwarts ghosts to track Peeves and Colin Creevey, while agreeing to ask Vaughn or Dumbledore for help if necessary; Vaughn later entered their dormitory with his wand glowing red.

• Harry realized Ron was mooning over Hermione and worried that their friendship with her would become strained.
• Harry endured Oliver Wood’s rain-soaked Quidditch training, then visited Hagrid and heard that Vaughn and Rosier’s pumpkin seeds had produced an enormous crop for Halloween.
• Neville told Harry and Ron that the Dueling Club would begin the following Saturday, and the three went to register among students and ghosts.
• Peeves drenched Harry and Ron with water balloons, and Nearly Headless Nick mentioned an evil notebook, leading Harry and Ron to suspect Peeves had found Harry’s lost notebook.
• Harry and Ron decided to ask the ghosts to help track Peeves and Colin Creevey, and agreed they would turn to Vaughn or Dumbledore if their plan failed.
• Vaughn entered Harry and Ron’s dormitory at night with his wand casting a red glow.

Vaughn examined Harry’s memories and warned Dumbledore that an unknown force had affected Harry’s mind. They then confronted the disturbance near the Chamber of Secrets, saved Mrs. Norris, and Dumbledore opened the Chamber’s entrance by recording Parseltongue with a magical music box.

• Vaughn extracted and examined Harry’s memories, finding no current abnormality but confirming that an unknown force had previously affected Harry’s mind.
• Dumbledore admitted he planned to use the diary to spur Harry’s growth, and he asked Vaughn to help investigate the evil stirring in the castle.
• Filch found Mrs. Norris injured in a dark corridor, and Vaughn and Dumbledore helped him get her to the hospital wing.
• Vaughn identified Filch’s book, Quick Casting, as a scam, then joined Dumbledore at the abandoned lavatory entrance to the Chamber of Secrets.
• Dumbledore revealed that he had borrowed Nicolas Flamel’s music box and used it to record Parseltongue, causing the hidden entrance to open.

Vaughn accompanied Dumbledore into the Chamber of Secrets, where Dumbledore hoped to find knowledge about Horcruxes and a way to help Harry. As they reached the Basilisk’s hiding place, Dumbledore began reconsidering Slytherin’s motives in the context of the Dark Ages, leaving his true plan unresolved.

• Vaughn questioned Dumbledore’s purpose for bringing him to the Chamber, and Dumbledore asked him to follow below before explaining.
• Vaughn and Dumbledore crawled through a deep pipe, crossed a damp cave, and opened the Chamber’s entrance with a music box that hissed in Parseltongue.
• Vaughn confirmed that the Basilisk had not yet awakened, and he and Dumbledore explored the vast chamber, finding no inheritance or Horcrux knowledge.
• Dumbledore told Vaughn he had hoped to find knowledge that could help Harry, and explained that he suspected Tom had learned about Horcruxes from Slytherin’s inheritance.
• Vaughn spotted the Basilisk’s possible hiding place inside a giant statue, while Dumbledore discussed whether Slytherin’s opposition to Muggle-born students reflected fear of exposure during the Dark Ages.

Dumbledore argued that Salazar Slytherin may have created a Horcrux in the Chamber of Secrets and that Tom Riddle reopened it to revive Slytherin and gain his help. Vaughn accepted the theory as plausible, and they considered how to investigate it without killing the Basilisk.

• Dumbledore illuminated the Chamber and argued that Slytherin may have built it as a place to prepare for resurrection rather than to attack Muggle-borns.
• Vaughn reasoned that the Basilisk might be Slytherin's Horcrux and that the diary's Tom Riddle had reopened the Chamber to revive Slytherin.
• Dumbledore explained that the diary fragment may have learned of Voldemort's failure and sought power and a path to resurrection, while Vaughn recalled Voldemort's instructions to Lucius Malfoy about returning the diary to Hogwarts.
• Vaughn proposed killing the Basilisk to examine its soul, but Dumbledore warned that its death could also kill Slytherin if it was a Horcrux.
• Vaughn suggested investigating Morfin Gaunt's memories in Azkaban, and Dumbledore hesitated because another visit might further damage Morfin's unstable mind.

Vaughn agreed to help Dumbledore track the notebook and protect Colin Creevey, while warning him against trying to resurrect Slytherin. After retrieving and activating the Marauder's Map, Vaughn found Peter Pettigrew near Harry and Ron, then spotted Creevey with Peeves in a secret passage.

• Vaughn gave Dumbledore a magical mist that could help him sense the notebook and advised him to draw Creevey into the Dueling Club without arousing Tom's suspicion.
• Vaughn warned Dumbledore not to resurrect Slytherin in hopes of solving Harry's Horcrux problem, then left the Chamber of Secrets with Fruit Tea.
• Vaughn checked on Mrs. Norris in the infirmary and asked Filch to retrieve a blank parchment from his office.
• Vaughn activated the Marauder's Map and saw Peter Pettigrew's name beside rat tracks near Harry and Ron, who were asleep.
• Vaughn studied the map's connection to Hogwarts and found Peeves and Colin Creevey together in a secret passage on the fourth floor.

Harry and Ron learned that Malfoy had joined the Slytherin Quidditch team with a fleet of Nimbus 2001s, and the Gryffindor team was badly beaten in a brawl. As the Dueling Club’s first event began, Harry, Ron, and Hermione arrived at a packed training ground filled with students and professors, while Vaughn prepared to teach them.

• Vaughn failed to locate Tom Riddle’s notebook precisely and left the investigation to Dumbledore.
• Harry celebrated Mrs. Norris’s injury, but Malfoy revealed that he had become Slytherin’s Seeker and that his father had bought Nimbus 2001s for the entire team.
• Malfoy and the Slytherin players fought the Gryffindor team at the pitch and overwhelmed Harry, Wood, and the others.
• Harry, Ron, and Hermione gradually resumed spending time together, and Ron joined Harry’s Quidditch training with Hermione watching.
• Vaughn prepared for the Dueling Club while continuing work on the Wolfsbane Potion and his alchemy studies, and the notebook remained quiet.
• Harry, Ron, and Hermione arrived at the crowded Dueling Club event, where Percy organized attendees and several professors gathered.

At the Dueling Club’s first event, Vaughn explained why he and Professor Isabella Rosier had reformed practical Defense Against the Dark Arts classes, using an illusion of a North American battle to show students the dangers wizards faced. He began introducing the importance of spells, leaving his speech underway.

• Harry and Ron avoided Snape after their potion made a Moloch Rat lose all its fur, then learned from Colin Creevey that Slytherins were spreading rumors about them.
• Hermione accused Harry and Ron of failing to plan how to retrieve the bewitched notebook from Colin, but postponed the discussion when Vaughn and Professor Isabella Rosier arrived.
• Vaughn opened the Dueling Club event by declaring that the wizarding world was not peaceful and showing the students an illusion of a battle in North America, including the Killing Curse.
• Vaughn told the students that fear was an important lesson and announced that practical classes would become more difficult and might recreate events for students to experience.
• Vaughn introduced plans for an information-sharing center, then began explaining that wands and spells were the most important tools a wizard could rely on.

Vaughn lectured the Dueling Club about Ancient Magic and argued that a wizard’s strength mattered more than simply learning powerful spells. After dazzling the students with an enhanced Lumos demonstration, he invited them to challenge him and began a duel against six students at once, leaving the fight underway as they launched advanced spells.

• Vaughn explained the difficult rituals behind Animagus transformation and contrasted Ancient Magic with the more convenient Modern Charms system.
• Vaughn transformed Lumos into a brilliant, multicolored light that he expanded, divided, exploded, and recalled, then urged students to grow stronger rather than merely seek powerful spells.
• Vaughn invited students to duel him using their strongest magic while he restricted himself to basic spells, and six students volunteered, including Draco and Cedric Diggory.
• Vaughn announced that all six would fight him together, and a Ravenclaw sixth-year opened with Deprimo, collapsing the ground beneath him.
• Vaughn used the Feather-Light Charm to float above the collapsing ground as a Gryffindor sixth-year summoned a storm cloud overhead.

Vaughn demonstrated how mastery of basic spells could defeat powerful attacks, then set Hogwarts students the task of practicing the Levitation Charm to Level 2. As Harry, Ron, and Hermione went to visit Hagrid, they discovered that someone had killed all the chickens in his coop.

• Vaughn countered the older students’ amplified spells and defeated five of the six challengers with a powerful Stunning Spell, then explained his spell-grading system and assigned the Levitation Charm as the first practice task.
• Harry and Ron struggled to keep their paper airplanes aloft, while Hermione managed the Levitation Charm with ease.
• Harry, Ron, and Hermione discussed Vaughn’s unusual conversation with Colin Creevey and wondered whether Vaughn knew about the notebook.
• The trio arrived at Hagrid’s hut and found him furious over the deaths of all his chickens, which had been killed without visible wounds or signs of being eaten.
• Hagrid suspected a student was responsible, and Hermione reasoned that the chickens had likely been poisoned or killed with magic.

Harry, Ron, and Hermione found no evidence of who killed Hagrid’s chickens, while Vaughn and Dumbledore discussed using Colin Creevey to make Tom Riddle lower his guard and reveal his plans for the Basilisk. Vaughn also agreed to finish the second-version Wolfsbane Potion amid rising conflict over North American werewolves, then reflected on his own role in stirring the protests as Matthew remembered how Vaughn had changed his life.

• Harry, Ron, and Hermione suspected the diary might have bewitched a first-year to kill Hagrid’s chickens, but found no evidence and left Hagrid grieving.
• Dumbledore told Vaughn he had adjusted Colin Creevey’s emotions so Tom Riddle would feel secure enough to test his plans by killing the chickens, and explained that he wanted to learn why Tom needed the Basilisk.
• Vaughn agreed to complete and announce the second-version Wolfsbane Potion after Amelia asked for help easing the escalating dispute between North American werewolves and English wizards.
• After speaking with Amelia, Vaughn admitted to himself that he had orchestrated the werewolves’ protests and planned to rein in their ambitious leaders before the movement escaped his control.
• Matthew woke from a nightmare, remembered the trauma of Greyback turning him into a werewolf, and reflected on Vaughn as an unfathomable presence like the sky.

Matthew received a letter revealing Vaughn Weasley's decision to abandon the North American werewolf separatists, and he welcomed his master's ruthlessness. Meanwhile, John Mir negotiated with shadowy opponents to spark a bloody clash against the werewolves, while the conspirators debated Vaughn's possible response and arranged to proceed.

• Matthew read and burned a letter announcing that the separatists' usefulness to Vaughn Weasley was ending, and he felt exhilarated by his master's ruthlessness.
• John Mir led the North American werewolves' march through Diagon Alley as conservative wizards gathered to watch and the protesters grew uneasy.
• John Mir met Mr. Mysterious in Borgin and Burkes's basement and demanded support for the werewolves' practical needs in exchange for provoking a bloody incident.
• Mr. Mysterious agreed to discuss John Mir's conditions, and John Mir promised that a clash would happen within days.
• After John Mir left, the conspirators discussed abandoning the werewolves to bounty hunters and questioned whether Vaughn Weasley could detect their plans.

John Mir learned that Vaughn Weasley had completed a new Wolfsbane Potion that could suppress transformations during the full moon, threatening his hold over the North American werewolves and his conspiracy against C. He hurried to meet his backers in Borgin and Burkes and told them the news, leaving their response unknown.

• Mr. Mystery worried that John Mir was underestimating Vaughn Weasley, but accepted that the separatists offered the best chance to reach C.
• John Mir returned to the werewolf settlement and learned from Joseph François that Vaughn Weasley’s second-version Wolfsbane Potion could preserve werewolves’ human forms during the full moon.
• John Mir realized the potion could revive the werewolves’ hopes of returning to human society and undermine his control, so he decided to consult his backers.
• John Mir avoided the Floo Network, traveled by Knight Bus to Knockturn Alley, and went to Borgin and Burkes to request an urgent meeting.
• Borgin sent John Mir through a Vanishing Cabinet to meet five concealed backers, and John Mir told them about the new potion.

John Mir warned Mister Mystery that news of the new Wolfsbane Potion threatened their plans, but Vaughn Weasley launched a surprise attack on the meeting in Borgin's basement. Vaughn pinned John Mir and overwhelmed the five backers, who began planning a desperate escape.

• John Mir told Mister Mystery that Joseph François had learned about the new Wolfsbane Potion through Matthew, and Mister Mystery asked whether Mir could act that night.
• John Mir demanded immediate money and promises for the werewolves he had recruited, but a strange wind in the basement alerted him to danger.
• John Mir used an enhanced Lumos Charm to expose Vaughn Weasley's Dimensional Gate, then tried to flee as the backers raised their wands.
• Vaughn Weasley summoned John Mir back, pinned him to the floor, and defended himself against the five backers while countering their attacks.
• Mister Mystery told the others to abandon the Vanishing Cabinet and break out of the basement so they could Apparate separately.

John Mir escaped the basement with the help of the five cloaked wizards, but Vaughn Weasley pursued him through Apparition and captured him in a mountain forest. After defeating John’s last attacks, Vaughn told him he understood his motives but was not interested in hearing them.

• Mister Mysterious and the other wizards freed John Mir to distract Vaughn, and John used a movement spell to reach his wand and attack Vaughn with a lightning serpent.
• John fled with the five wizards as Mister Mysterious unleashed Fiendfyre in the basement, but Vaughn emerged unharmed and followed them when they Apparated in different directions.
• Vaughn invaded John’s Apparition passage, seized him, and dragged him into a mountain forest.
• John cast the Cruciatus Curse again, but Vaughn endured it, disarmed John with a spell that struck across the woodland, and let him collapse.
• John asked whether Vaughn wanted to know why he had betrayed him, and Vaughn said he understood his possible motives but was not interested in them.

Vaughn revealed that he had engineered John Mir’s betrayal and planned to use a fabricated confession to unite the werewolves and turn wizarding families against one another. In Hogwarts’ Practical Lessons Classroom, Harry, Ron, and Hermione escaped an enraged Occamy and suspected that someone had stolen its hatchling.

• John Mir learned that François had been working for Vaughn from the beginning and had killed Alexander and another man on Vaughn’s orders.
• Vaughn showed John a memory altered to include accusations against numerous wizarding families, explaining that John would serve as an excuse to unite the werewolves and sow conflict among their enemies.
• John’s resolve collapsed as he understood Vaughn’s plan, and Vaughn used Legilimency on him.
• Harry, Ron, and Hermione emerged from hiding after an angry Occamy tore through the forest, then fed woodlice to the Bowtruckles sheltering them.
• Ron reasoned that someone had stolen an Occamy hatchling, and the trio decided to return to camp so Professor Rosier could investigate.

Harry, Ron, and Hermione learned that an Occamy’s stolen young had caused chaos in the camp, while the Daily Prophet reported Vaughn’s breakthrough in the Liverpool werewolf murders. At the Wizengamot, Vaughn accused prominent pure-blood families of conspiring behind the killings and protests, and the session recessed before Rufus Scrimgeour brought Amelia the interrogation results.

• Harry, Ron, and Hermione returned to camp, where Professor Rosier had gone to calm a furious Occamy whose baby had been stolen.
• Hermione confronted a sixth-year girl who mocked her relationship with Vaughn, and the trio learned Vaughn had gone to the Wizengamot.
• Professor Rosier announced that a student had taken the Occamy’s young and warned the culprit to confess.
• Harry and his friends read Rita Skeeter’s report claiming Vaughn had arrested John Mir and obtained a list of conspirators behind the werewolf murders and protests.
• Vaughn presented John Mir’s list to the Wizengamot, exposed the names of sixteen Sacred Twenty-Eight families, and clashed with Yaxley and Russell Lestrange over his use of Legilimency.
• Amelia recessed the Wizengamot session, and Rufus Scrimgeour arrived in her office with the results of John Mir’s interrogation.