Chapter Summaries

Kayson investigated Neos’s habits and the suspicious circumstances around Harry becoming a Triwizard Champion, then went looking for Dumbledore. When Sirius appeared stuck in Kayson’s ceiling, Kayson accidentally broke his neck while pulling him free, but Madam Pomfrey healed him, and Sirius said he had come to ask about Harry.

• Kayson questioned Lu Ping about Neos’s routine, Hogwarts food, and the mirror’s surveillance, then went to find Dumbledore.
• Kayson learned from Grindelwald that Dumbledore had left to handle the Champions’ selection and apologize to the other schools.
• The next morning, Kayson found Sirius with his head embedded in the ceiling and broke his neck while trying to pull him down.
• Madam Pomfrey repaired Sirius’s neck with Kayson’s help, and Sirius recovered after taking Skele-Gro.
• Sirius told Kayson that he had come to ask about Harry, while Madam Pomfrey urged them both to behave more carefully.

Kayson and Sirius arranged to question Neos with Veritaserum after suspecting him of framing Harry. Neos appeared to answer truthfully, but he broke free of their control and pointed an unfamiliar wand at Kayson, casting the Killing Curse.

• Sirius and Kayson discussed ways to find whoever framed Harry, then planned to question Neos with Veritaserum and bring Lockhart to erase the memory if Neos proved innocent.
• Kayson fetched Veritaserum from Snape, recruited Lupin to lure Neos out, and brought Lockhart from St Mungo's.
• Lupin disarmed Neos at their meeting, but Neos attacked Kayson and was forced to his knees.
• Sirius gave Neos Veritaserum, and Neos denied framing Harry, being a Death Eater or Dark Wizard, and knowing about the purple lights.
• Kayson realized Neos had only pretended to be under the Veritaserum's control when Neos produced an unfamiliar wand and cast Avada Kedavra at him.

Kayson captured Neos and brought him to Dumbledore, who identified him as an alchemy golem. Neos had destroyed his memory storage, leaving Kayson without the information he hoped to obtain.

• Neos attacked Lockhart and fought Kayson, Sirius, and Lu Ping in the forest.
• Kayson tore off Neos's remaining arm, bound him in cobwebs, and locked him in an iron cage.
• Kayson asked Sirius to get Lockhart out of the forest and took Neos to Dumbledore's office.
• Dumbledore identified Neos as an alchemy golem and teased Kayson for failing to recognize one.
• Dumbledore explained that Neos had likely destroyed his memory storage on the way, and Kayson lamented that their lead was gone.

Kayson and Dumbledore concluded that Neos had been an alchemy puppet and that another hidden Death Eater might still be at Hogwarts, so they planned to keep the unknown enemy under surveillance. After the battle, Kayson revived Lockhart and Sirius decided to stay at Hogwarts to watch over Harry.

• Dumbledore comforted Kayson, who realized an alchemy puppet might cast magic only with an operator or help from another hidden enemy.
• Kayson and Dumbledore agreed to monitor the unknown Death Eater without exposing him and joked about using a Hogwarts-wide hangover to test Polyjuice Potion.
• Kayson returned to the Forbidden Forest and revived Lockhart with three life-restoring potions, then erased Lockhart’s memories of the incident and took him to St Mungo’s.
• Kayson told Lupin and Sirius that Neos had been an alchemy golem that destroyed his own memory storage, leaving them without useful information.
• Lupin suggested Neos might have been eaten by an Acromantula, and Sirius chose to stay at Hogwarts and watch over Harry.

Kayson brought Ollivander to Hogwarts to continue their nearly finished paper, using alchemy to transport them. After Dumbledore urged them to the Great Hall, Kayson prepared to make a deliberately extravagant show of deference, but Snape and Sirius stopped him.

• Sirius asked Kayson for a doghouse after Dumbledore refused to give him a room, but Kayson pointed to the sign forbidding Sirius and dogs from his office.
• Dumbledore assigned Kayson a task despite Kayson's protests about losing his day off.
• Kayson collected Ollivander from his shop and used alchemy to transport them to Hogwarts.
• Kayson and Ollivander strolled through the corridors before reaching the Great Hall, where Dumbledore welcomed them.
• Kayson started to kneel and perform an elaborate ceremony for Dumbledore, but Snape and Sirius hauled him upright.

Kayson gave Sirius a way to deal with Rita Skeeter, and Hogwarts students abducted and buried Rita and her photographer. Ludo Bagman tried to intervene, but Arthur refused to listen as the confrontation threatened to escalate.

• Snape stopped Kayson from making Hogwarts lose face, and Dumbledore took Ollivander to inspect the champions' wands.
• Sirius complained that Rita Skeeter was spreading rumors about Harry and the others, so Kayson offered three strategies for dealing with her.
• Kayson summoned upper-year students and sent them with Sirius to confront Rita; Arthur disarmed Rita and her photographer, struck them with a shovel, and ordered the students to bury them.
• Dumbledore and Ludo Bagman arrived as Arthur's group buried Rita and her photographer, while Sirius sat nearby in thought.
• Ludo asked Arthur to release the pair, but Arthur dismissed his words and reached toward his wand, prompting Dumbledore to tell Mr. Morgan not to make a move.

After Rita Skeeter remained buried outside Hogwarts, Harry asked Kayson for alchemy tutoring but was told to study Dark Magic instead, leaving him feeling overlooked as Kayson continued working with Cedric. Cedric worried about Harry’s hurt feelings, while Kayson offered a confusing, apparently fabricated story about his own childhood before they returned to their work.

• Arthur photographed Rita Skeeter while she remained buried outside the school gates, and the group returned to the Great Hall.
• Harry asked Kayson for private alchemy lessons, but Kayson said Harry’s restless nature made alchemy a poor fit and recommended studying destructive Dark Magic instead.
• Harry watched Kayson help Cedric fit a mechanical arm and, feeling overlooked and envious, left the alchemy office.
• Cedric apologized for upsetting Harry, and Kayson said such feelings were common before claiming he had once been jealous of a younger brother.
• Cedric questioned Kayson’s story about having a younger brother because Kayson had claimed to be an orphan, and Kayson called the contradiction a private lesson about not telling too many truths.

Cedric learned that the Triwizard Tournament’s first task involved dragons, while Hagrid sought Kayson’s advice after offending Madame Maxime on a date. Kayson convinced Hagrid to apologize and invite her out again, though his matchmaking tests produced confusing results.

• Cedric told Kayson that Hagrid had revealed the dragon task to Madame Maxime and Harry, and that his date with Madame Maxime had ended badly.
• Hagrid explained that Madame Maxime had taken offense when he asked whether she had giant blood, and Kayson advised him to invite her out again and apologize.
• Kayson argued that Madame Maxime’s acceptance of Hagrid’s midnight invitation and her excitement at seeing the dragons showed that she liked him.
• Kayson tested his theory by having Cedric invite Perthia and Hermione out, then dismissed Ron after Ron failed to understand the experiment.
• Hagrid concluded that Madame Maxime at least did not dislike him and decided to find another reason to invite her out and apologize.

Kayson sent Cedric to give Harry an alchemical backpack after noticing Harry’s jealousy, while Harry trained with Lupin and Sirius in the Forbidden Forest. Harry tested the backpack’s controls, activating a powerful shield and then a red button that sent him flying into the sky.

• Kayson gave Cedric an alchemical backpack for Harry and told him that Hogwarts’ Champions should not turn against each other.
• Harry trained with Lupin and Sirius in the Forbidden Forest using spells from the Black family library.
• Cedric delivered the backpack to Harry and said Kayson had made it for him.
• Harry, Lupin, and Sirius tested the backpack, and its blue button produced a shield that withstood powerful magic.
• Harry pressed the red button, and he flew into the sky.

As the Triwizard Tournament was about to begin, Kayson helped Harry discover how to transform his Alchemy backpack into armor and joined Professor Sprout in the stands. He suspected the competition might be rigged, leaving the question unresolved as the Champions prepared to compete.

• Cedric altered his teacher's orders and went to study in the library instead of returning to the alchemy office.
• Kayson ended his lesson early and waited for the Triwizard Tournament to begin after lunch.
• Kayson showed Harry how to activate and retract the armor form of his Alchemy backpack, then Hermione and the other young wizards went outside to cheer Harry on.
• Professor Sprout brought Kayson snacks and asked whether the tournament might be rigged.
• Kayson agreed that it might be, and Professor Sprout remarked that Dumbledore would never be honest.

Kayson watched the Triwizard Tournament contestants face dragons, and Harry used alchemical equipment to snatch the golden egg before the judges debated whether it was allowed. As Cedric prepared for his turn, Kayson urged him to use his own handmade equipment and beat the competition.

• Krum distracted a dragon, summoned the golden egg from its nest, and escaped with it after a long fight.
• Pheobe hypnotized her dragon and took the golden egg, earning generous scores from the judges.
• Harry flew past his dragon with alchemical equipment, grabbed the golden egg, and escaped, prompting Madame Maxime to protest that he had cheated.
• Kayson told the judges that Harry had made the equipment himself, and Harry received a score nine points below full marks.
• Cedric hesitated over whether to use his own equipment, and Kayson encouraged him by making a throat-slashing gesture.

Cedric Diggory fought the dragon with alchemical devices and killed it while retrieving the golden egg, stunning Kayson and the other spectators. He then told reporters he had slain the dragon to bring glory to Hogwarts and blamed questions about his methods on his mentor, leaving Kayson furious.

• Cedric used mechanical arms, an Enchanting Table, and the dragon’s own fire to bind it before smashing its skull and killing it with a brutal physical attack.
• Kayson and the other professors watched in confusion as Cedric defeated the dragon without relying on ordinary spells.
• Cedric left the arena carrying the golden egg and told reporters he had killed the dragon to perform well and bring glory to Hogwarts.
• When reporters asked whether Kayson had instructed him, Cedric refused to answer and directed them to his mentor, angering Kayson.

Kayson defended Cedric from reporters and Madame Maxime’s objections, then finished the Hogwarts Titan and gave Professor McGonagall the necklace that let her pilot it. The Titan was ready to move, though controlling it would leave its pilot with severe soul fatigue.

• Kayson sent away reporters who questioned Cedric’s dragon-killing method and took responsibility for the assignment that had led to it.
• Kayson told Madame Maxime that alchemy was simply another kind of knowledge and that Beauxbatons could seek help from Nicolas Flamel.
• The next day, Kayson completed Hogwarts’s alchemy rails and tested the Titan’s ability to walk under a controller’s command.
• Kayson adjusted the soul branches and Redstone circuits in a Netherite control room, then sealed the room.
• Kayson gave Professor McGonagall a necklace that connected her to the soul branches so she could pilot Hogwarts, warning that it would cause a week of soul fatigue.
• Kayson explained that Lockhart’s reporter-sealing bag would connect to the pilot along with the soul branches.

Kayson helped Harry and Cedric uncover the golden egg’s clue, which pointed to the merpeople in the Black Lake and a likely underwater task. When Kayson offered to help Harry prepare with alchemy, Harry resentfully insisted he could handle it himself.

• Kayson met Harry and Cedric in his office and reassured Cedric that he had already taken the blame for killing the dragon.
• Kayson examined the golden egg, used water to reveal its real clue, and recognized the gurgling song as a message from the merpeople.
• Kayson and Cedric discussed the merpeople’s song and guessed that the next task might involve rescuing someone’s most precious treasure.
• Harry asked how he could breathe underwater, and Kayson suggested the Bubble-Head Charm while Cedric explained that it was complicated.
• After Kayson offered to help Harry with alchemy, Harry sarcastically recalled Kayson saying he lacked talent and declared that he could handle the challenge himself.

Kayson taught his Alchemy students about runes and discussed the Christmas Ball plans with Dumbledore, Harry, and Ron. When Harry and Ron struggled to find dance partners, Kayson hinted at a special potion that made them rethink their reluctance to ask someone.

• Kayson sent Harry off to handle a problem on his own, then taught the class how runes could make enchantments do unusual things.
• Dumbledore reminded Kayson of their plan to use a Christmas drinking party and a Polyjuice Potion antidote to identify an outsider hiding at Hogwarts.
• Harry and Ron asked Kayson for help finding dance partners, and Kayson suggested Ron invite Hermione.
• Ron learned that Viktor Krum had already asked Hermione, while Harry still had no partner.
• Kayson hinted that Snape had invented a special potion, and he used his mechanical arm to stop Harry and Ron from leaving before they reconsidered finding partners.

Kayson’s potion turned Harry into Harriet, while Hermione reconsidered her dance partner and chose to reject Krum for Ron. The chapter ends with Kayson taking Harriet to Snape to ask for an antidote.

• Kayson gave Harry and Ron Snape’s potion, promising that one of them would find a dance partner if they drank it.
• Hermione told Kayson she regretted agreeing to dance with one suitor, and he advised her to reject him and choose the other.
• Hermione went to reject Krum, while Kayson hurried to Gryffindor Tower to check whether Ron had taken the potion.
• Kayson found Harry transformed into a girl and sent Ron to find Hermione after explaining that she had rejected Krum for him.
• Kayson led Harriet away from the crowded common room and explained that she would remain a girl for more than a month unless Snape had an antidote.
• Kayson and Harriet arrived at Snape’s Potions office and knocked on the door.

Kayson and Hally asked Snape for an antidote to the gender-swapping potion, but learned it would take at least a month to brew. After Lupin said Hally looked just like her mother, she wondered whether Snape had secretly hated her all along.

• Kayson brought Hally to Snape’s office to ask about an antidote to the gender-swapping potion.
• Snape said he had no antidote ready and that brewing one would take at least a month, so Hally decided to leave without waiting.
• Snape told Kayson that the antidotes they had come for were ready to use.
• Kayson and Hally returned to the first floor, where Sirius greeted Hally as his goddaughter and Lupin said she looked like her mother.
• Hally connected Snape’s earlier remark about the Mirror of Erised to Lupin’s comment and wondered if Snape hated her.

Harriet moved into a separate dormitory while she waited for the potion to wear off, then attended Potions class as a girl under the name Harriet. Her improved work and Snape’s uncharacteristically generous treatment bewildered the students, and Draco ended the chapter by asking her to be his Christmas dance partner.

• Sirius brought Harriet formal clothes and warned her to keep Ron and Neville away from her.
• Harriet said goodbye to Ron and Neville as she moved to a separate dormitory for a month.
• Draco noticed Harriet beside Hermione but could not recognize her, while Snape awarded her points and praised her potion work.
• Draco brewed an antidote to Polyjuice Potion, suspected Snape was under the Imperius Curse, and was slapped back into his seat by Snape.
• Harriet earned nearly forty points for Gryffindor during the lesson, leaving Draco puzzled about who she was.
• Draco asked Harriet to be his Christmas dance partner.

Draco asked Harriet to be his Yule Ball dance partner, but Snape blasted him through a window into the Black Lake, where Kayson found him fishing. Harriet later told Kayson about the invitation and decided she wanted to refuse, though she still had to figure out how to do so without revealing her secret.

• Draco asked Harriet to be his dance partner, and Snape sent him flying into the Black Lake with a spell.
• Kayson caught Draco with his enchanted fishing rod and advised him to introduce himself and treat Harriet with sincerity.
• Draco doubted Kayson's romantic advice, so Kayson hit him with a textbook and sent him back into the lake.
• Harriet visited Kayson in his office and told him that someone she did not know had confessed to her.
• Kayson asked Harriet whether she wanted to accept or refuse, and Harriet said she wanted to refuse.

Harriet sought advice from Kayson about rejecting Draco’s invitation, then heard Sirius warn her that Snape might be attracted to her resemblance to Lily. Frightened by the thought of being Snape’s dance partner, Harriet accepted Draco’s invitation when he approached her.

• Harriet asked Kayson how to reject Draco politely, and he advised her to do it privately and directly.
• Sirius told Harriet that Snape had once been Lily’s childhood friend and explained why Snape had held a grudge against her.
• Sirius warned Harriet that Snape might try to use a Love Potion because she now looked like Lily, leaving Harriet alarmed.
• Harriet decided to accept the first person she saw as her dance partner, and Draco invited her to the Christmas Ball.
• Harriet accepted Draco’s invitation after noticing Goyle standing behind him.