Arc 38The Obscurus and Slughorn

William and Hermione uncovered the Scourers’ plan to destroy New York with an Obscurus, rescued the abducted children, and stopped Graves by redirecting the blast. Back in Britain, William recruited Slughorn for Hogwarts and returned to a Diagon Alley threatened by Death Eaters and mysterious kidnappings.

  • William and Hermione investigated Tom’s Scourer gathering in New York, where Tom preached wizard supremacy and arranged for William to arrest him to advance his standing.
  • William learned that the Scourers were abducting magical children to create an Obscurial and enlisted Newt, Tina, and Hermione to trace the missing children and their captor.
  • William and Hermione found the children, including Lucas Picquery, in Graves’s hidden chamber and rescued them while Graves took Mera to the Congress execution chamber.
  • William stopped Graves from sacrificing Mera, but Graves revealed that an Obscurus inside him would destroy New York, so William transferred the Obscurus through Vanishing Cabinets and escaped with Mera.
  • William received public honors for saving New York, learned Newt’s method for handling an Obscurus, and returned to Britain with Hermione.
  • Dumbledore asked William and Hermione to recruit Horace Slughorn, and William brought Harry along to approach him at his home.
  • William persuaded Slughorn to return to Hogwarts as Potions Professor, then told the Weasleys that Slughorn would take the post and explained how Arthur’s promotion could help regulate counterfeit protective products.
  • William investigated the Death Eaters’ rampage in Diagon Alley, where Ollivander and Florean Fortescue had vanished, and told Fred and George to delay buying more shops.
Chapters 927–951 Vol. 10 Read

Ch. 927Ilvermorny School of Witchcraft and Wizardry

William and Hermione arrived at Ilvermorny under assumed identities, with Professor Babbling revealing that she had used William’s appearance to approach Miss Picquery. They reached the castle and saw the statues of its founders, Isolt Sayre and James Steward, as they began searching for the Slytherin Snakewood Wand.

  • William and Hermione reached Ilvermorny by carriage while William posed as Professor Targaryen and Hermione posed as Katherine.
  • Roger told William that Miss Picquery had come looking for him.
  • William confronted Professor Babbling through his Safety Watch, and she admitted she had impersonated him to gather information from Picquery.
  • William and Hermione walked from the parking area toward Ilvermorny’s castle and admired its imposing architecture.
  • William and Hermione saw the statues of Isolt Sayre and James Steward and came to Ilvermorny seeking Isolt’s Slytherin Snakewood Wand.

Ch. 928Tom's Climb Through the Ranks

William arrived at Ilvermorny and learned about Babbling’s history with Professor Fontana and Tom’s progress among the Scourers. He received an address where Tom might be, and planned to find him.

  • William met Professor Fontana, who resented him because Babbling had dated and dumped his daughter and was competing with him for the headmaster position.
  • In the Ancient Runes office, Babbling explained that the Snakewood Wand had become the snakewood tree and that Tom had awakened it with Parseltongue.
  • Babbling told William that Tom had risen to the Scourers’ thirty-second rank and was seeking an invitation to their thirty-third rank.
  • Babbling gave William an address where Tom might be, and William decided to look for him.

Ch. 929The Magical Congress of the United States of America

William and Hermione traveled to New York to find Tom, arriving at the Woolworth Building, headquarters of the Magical Congress of the United States of America. They entered the Congress and headed for the Department of Major Crimes Investigation, where Red recognized William and asked if they were looking for Miss Picquery.

  • Babbling returned to the United Kingdom through a Vanishing Cabinet, leaving William able to maintain his public identity in the United States.
  • William and Hermione explored Ilvermorny, then prepared to travel to New York to find Tom.
  • William and Hermione arrived at the Woolworth Building and entered the Magical Congress of the United States of America.
  • Hermione saw the Congress’s grand hall, its Magical Exposure Threat Level dial, and wizards having their wands checked by a house-elf.
  • Red greeted William in the elevator and guessed that he and Hermione were looking for Miss Picquery.

Ch. 930Tesla Graves

Mera Picquery learned that six Muggle children had gone missing while attending a Magical Security meeting, but her attention was distracted by news of William Stark and the war in Britain. After Professor Targaryen arrived with a girl to see her, Tesla Graves stayed behind, studying Stark’s photograph and thinking.

  • Mera Picquery secretly read a newspaper about William Stark during a meeting on six missing Muggle children.
  • Tesla Graves corrected Mera when she mistakenly answered a question about the missing children with her opinion on joining the war in Britain.
  • Tesla asked Mera about Stark, and she described him as an exceptionally powerful wizard before admitting she could not predict who would win the war.
  • Tesla told Mera that the Magical Congress was debating the war, while the Scourers, Third Salem, and missing children were also causing trouble.
  • A witch told Mera that Professor Targaryen had arrived with a pretty girl to see her, and Mera hurried out to meet them.
  • Tesla watched Mera leave and studied Stark’s photograph in thought.

Ch. 931William Pulls Out and Leaves Her Cold

William and Hermione visited Mera Picquery, where Hermione sparred with Mera over her closeness to William. Mera revealed that missing children and a group called Third Salem were linked to suspicious magical activity, and William left with Hermione to investigate their speeches on Liberty Island.

  • Mera welcomed William and Hermione into her Auror cubicle and asked Hermione who she was.
  • Hermione introduced herself as Katherine, claimed to be William’s old friend, and competed with Mera for his attention.
  • William asked Mera about the Scourers, and she explained that six children from Muggle families had recently gone missing after magical activity was detected in their neighborhood.
  • Mera told William that Third Salem, an organization connected to the Scourers, was under Magical Congress surveillance and had been giving speeches around the area.
  • Mera identified Liberty Island as a location for Third Salem’s speeches, and William hurried away with Hermione to investigate.

Ch. 932Mortal Bodies, Equal to Gods

William and Hermione attended a Salem Association gathering inside the Statue of Liberty, where Tom Riddle addressed hundreds of wizards under the name Osiris. Tom urged them to reject the Statute of Secrecy and rule Muggles, leaving the crowd fired up by his call to restore wizards’ supposed godhood.

  • William learned from Picquery that a gathering was being held on Liberty Island and brought Hermione there.
  • William and Hermione entered the Statue of Liberty, whose interior had been expanded to hold the crowd of wizards.
  • Tom Riddle appeared before the gathering under the name Osiris and began addressing the crowd.
  • Tom argued that Muggle scientific progress had erased belief in wizards as gods and blamed the Statute of Secrecy for their decline.
  • Tom declared that wizards were born to rule the world and Muggles.

Ch. 933Professor, Hand Me Over to the Aurors!

Tom rallied wizards against the International Statute of Secrecy, arguing that Muggle scientific progress threatened the Wizarding World. When Aurors moved to arrest him and the crowd erupted into chaos, Tom appeared beside William and asked him to catch him and hand him over.

  • William suspected that Aurors were monitoring Tom’s gathering but stayed to hear what Tom intended.
  • Tom argued that Muggle science was advancing rapidly while wizarding magic lagged behind, and warned that the Statute of Secrecy would eventually fail.
  • Tom urged the wizards to unite and overthrow the Statute of Secrecy before the Muggles became too powerful.
  • An Auror captain ordered Tom seized, but the crowd blocked the Aurors as the hall erupted into fighting and smoke.
  • Tom appeared beside William and asked him to catch him and hand him over to the Aurors.

Ch. 934The Plan to Expose the Wizarding World

William learned that Tom wanted to be arrested so he could gain influence among the Scourers and enter their inner circle. Tom asked William to stop a secret plan to expose the Wizarding World by magically destroying New York, and the chapter ended with William punching Tom after binding him for the Aurors.

  • Tom told William he had planned to let him capture him and hand him over to the Aurors.
  • Tom explained that the Scourers planned to expose the Wizarding World during the British wizarding war, and that he opposed the timing and had been punished for speaking against it.
  • Tom said imprisonment would make him appear to be a persecuted leader, boost his standing, and help him reach the Scourers’ thirty-third degree.
  • Tom asked William to stop the exposure operation, claiming that Slytherin’s Prehistoric Mysteries were hidden in the Magical Congress’s prison and that William could gain the Congress’s trust by helping.
  • Tom revealed that an unidentified Scourer planned to wipe out New York with magical power, and William bound Tom before punching him to make the arrest look convincing.

Ch. 935Magical Power Capable of Destroying New York

William and Hermione questioned the captured Tom and learned of a plan to use magical power to destroy New York and expose the wizarding world. As Pete Picquery promised to imprison Tom, Mera reported that Lucas had gone missing, while the chapter revealed a hidden workshop where a man transformed captives into magical weapons.

  • William told Hermione that Tom had mentioned a plan involving power capable of destroying New York, and William doubted the Scourers had a wizard powerful enough to do it with ordinary magic.
  • Pete Picquery thanked William and Hermione, learned Tom was not an Ilvermorny student, and promised to send him to Appalachia Prison.
  • Mera rushed in and told Pete that Lucas was missing.
  • A man carried a captive into a hidden chamber concealed behind a painting of The Salem Witch Trials and prepared the captive for transformation.
  • The man used a black, volatile substance and unicorn blood to create another magical weapon, believing his weapons could destroy the Magical Congress and New York.

Ch. 936The Quill of Acceptance and the Book of Admittance

After Lucas Picquery vanished on a children’s broomstick, William and Hermione suspected that someone was abducting young wizards rather than targeting Muggle children at random. William realized that Ilvermorny’s records could confirm whether the missing children had magical ability, and the chapter left him ready to investigate.

  • Lucas Picquery disappeared when his broomstick suddenly shot into the sky, and searches by the Aurors, staff, William, and Newt’s Niffler found no trace of him.
  • William told Hermione that the broomstick’s multiple safety features made a simultaneous failure unlikely, and Hermione suggested it had been cursed.
  • William and Hermione connected Lucas’s disappearance to six recent missing children from Muggle families and concluded that the abductors might have been seeking young wizards.
  • Hermione worried that the children were too young to have their magical abilities confirmed, but William pointed out that he could consult Ilvermorny’s records as a professor.
  • William explained how Hogwarts’s Quill of Acceptance and Book of Admittance recorded children with magical talent, and noted that Ilvermorny had a similar system.

Ch. 937Shocking! Was Old Man Newt the Mastermind All Along?

William and Hermione confirmed that the missing children were young witches and wizards who might be used to create an Obscurial, and William suspected the Scourers planned to use its power against New York. They went to find Newt Scamander for clues, but he was away, and a Niffler gave William a chance to prove his identity to the girl who answered the door.

  • Professor Fontana initially refused William access to the Book of Admittance, but Headmaster Eulalie Hicks’s portrait backed William’s authority and Fontana let him check it.
  • Hermione matched the missing children to the Book of Admittance and confirmed that all six were magical, bringing the number of abducted young witches and wizards to seven with Lucas.
  • William told Hermione that the Scourers might be trying to create an Obscurial and use its Obscurus to destroy New York, then revealed that Newt Scamander had once separated an Obscurus from its host.
  • William and Hermione went to Queenie’s home on Brownstone Street to ask Newt for clues, but a blond girl said he was at Jacob’s bakery selling doughnuts.
  • A Niffler opened the door, rummaged through Hermione’s pockets, and jumped onto William’s head; William shook Galleons from it and used the coins as proof that he was William Stark.

Ch. 938Captain America of the Wizarding World

William and Hermione visited Newt and learned how the United States once planned to mass-produce Obscuruses to create super wizards. The chapter left the investigation focused on the Auror Office and its former director, Sere Fontana.

  • Nicole welcomed William and Hermione, tried to borrow William’s wand, and asked him to take her to Hogwarts.
  • William tricked the Niffler into signing an IOU for a hundred Galleons in exchange for an enlarged coin.
  • Newt returned with Tina and Queenie, greeted William and Hermione, and invited them to stay for dinner.
  • William explained their investigation into people creating Obscurials, and Newt said he had not shared his preservation method with anyone.
  • Tina said the preserved Obscurus had gone to the Auror Office, where director Sere Fontana proposed studying it to mass-produce Obscuruses and train super wizards.

Ch. 939Who Was the Mastermind?

William realized that Professor Egbert Fontana was probably not the Scourer and identified Tesla Graves as a stronger suspect. He and Hermione searched Graves’s home and uncovered a cursed painting that opened onto a hidden passage.

  • Tina explained that Madam Picquery had rejected Sere Fontana’s Obscurus plan and ordered the Obscurus destroyed, while William and the others suspected Professor Egbert Fontana.
  • William reconsidered the clues and concluded that Percival Graves had been the first to find the Obscurus, making his son Tesla Graves a possible Scourer.
  • William sent Newt to Ilvermorny to investigate Fontana, sent Tina to the Magical Congress, and went with Hermione to Graves’s house.
  • Mera followed Graves out of the Office of Magical Security after he promised to ease her grief over her missing brother, Lucas.
  • William and Hermione used Newt’s Niffler to find a cursed painting in Graves’s empty house, and Hermione broke the curse to open it.

Ch. 940Wizarding World Exposure Threat Level: Fatal!

William searched Graves’s hidden chamber, collected the Obscuruses and rescued the captive children, including Lucas Picquery. At the Magical Congress, Stick Wilkins ordered the Aurors to withdraw as New York faced a potentially fatal Obscurus threat and Graves remained missing with Mera.

  • William found Unicorn Blood and separated Obscuruses in the hidden chamber and collected them along with the room’s other useful contents.
  • Hermione showed William a hidden room containing many young children and Lucas Picquery, whom they rescued and placed in the Safety Watch.
  • William contacted Newt and Tina, and Tina reported that Graves had taken Mera toward the lower floors of the Congress building.
  • Stick Wilkins watched Muggles gather outside the Woolworth Building while the Congress’s threat dial displayed a fatal exposure warning.
  • Pete Picquery urged Wilkins to withdraw the Aurors, and Wilkins agreed as he feared the Obscuruses could destroy New York.

Ch. 941The Countdown to New York's Destruction

William entered the Magical Congress building to save Mera and stop Graves from destroying New York, while Hermione stayed outside as his backup. In the execution chamber, Graves began forcing a mass of ten obscuri into Mera and lowered her toward the potion, setting his plan in motion.

  • Wilkins mistook William for Stark at first, then agreed to withdraw the Aurors and send them to defend the Atlantic coast after William instructed him to do so.
  • William entered the Magical Congress building alone, with Hermione remaining outside to help him escape if needed.
  • In the execution chamber, Graves revealed that he had gathered ten obscuri and planned to make them explode inside Mera, destroying New York.
  • Graves forced the obscurus mass into Mera and lowered her execution chair toward the potion as he prepared to leave the building.

Ch. 942The Deaths of Stark and Picquery

William rescued Mera Picquery from the death potion, defeated Graves, and learned that Graves had planted an Obscurus inside himself. With New York threatened, William asked Mera to trust him and leaped into the potion with her.

  • William arrived as a sea eagle and pulled Mera away from the boiling death potion, then knocked her unconscious and modified her memory.
  • Graves revealed his plan to expose the magical world and punish Mera’s family, while William mocked him and hinted at his connection to Stark.
  • Graves attacked William, but William overpowered him and left him near death.
  • Graves jumped into the potion, revealing that an Obscurus inside him would soon destroy New York.
  • Mera woke and asked about Graves, and William told her the city was in danger and asked whether she trusted him.
  • Mera took William’s hand, and he jumped with her into the death potion.

Ch. 943The Collapsing Statue of Liberty

William moved the Obscurus’s explosion to the Atlantic seabed, saving New York from the blast but unleashing a tsunami that smashed the Statue of Liberty and flooded the city. He and Hermione escaped with Tina and the unconscious Mera, then cooked dinner aboard a Swooping Evil as they planned to return home.

  • Wilkins and the Aurors gathered at New York Harbor while Graves waited beneath the Statue of Liberty for the explosion at the Congress building.
  • The Obscurus detonated on the seabed, and its magical eruption created a colossal wave that surged toward New York.
  • Wilkins ordered the Aurors to defend the city, but their shields failed, the tsunami toppled the Statue of Liberty, and its debris struck buildings.
  • William revealed that he had transferred the Obscurus through Vanishing Cabinets after finding Graves’s corpse in the death potion, then escaped with Mera.
  • Hermione, Tina, William, and the unconscious Mera flew over the Atlantic on a Swooping Evil while Hermione cooked the group a meal.
  • Hermione and William agreed to leave the United States as soon as possible, and Tina silently regarded them as the dangerous ones.

Ch. 944Returning to the United Kingdom

After the New York disaster, William let the truth about the Scourers emerge, gaining a hero’s reputation and the Order of the Mayflower while learning about Obscuruses. In mid-August, William and Hermione left Ilvermorny through the Vanishing Cabinet to return to the United Kingdom.

  • Voldemort’s Death Eaters blocked the Suez Canal, disrupting magical shipments to and from the United Kingdom.
  • The Magical Congress stayed silent about the destruction of New York, while Wilkins tried to persuade William to accept being an unsung hero.
  • Tom leaked that the Scourers had caused the disaster, and the Magical Congress publicly honored William as a hero with the First Class Order of the Mayflower.
  • William learned from Newt how to preserve and extract an Obscurus, while Mera Picquery recovered and invited him to her home; William declined.
  • In mid-August, William left his medal for Babbling, then entered the Vanishing Cabinet with Hermione to return to the United Kingdom.

Ch. 945Working Fifty Healthy Years for the Ministry of Magic

After returning to Ottery St Catchpole, William settled in with Hermione and worked on a curse to keep students focused on their homework and Ministry employees on task. Dumbledore then asked William and Hermione to recruit Horace Slughorn as Hogwarts’s new Potions Professor, explaining that Slughorn might agree to meet them.

  • Babbling stayed at William’s home, took over his planned vegetable patch with a swimming pool, and asked for a room of her own.
  • Hermione embarrassed Anne about Hermione’s room and then used a curse to keep Anne seated until she finished her summer homework.
  • William decided to develop Hermione’s homework curse into a product for students and Ministry employees while his family remained abroad in Venice for safety.
  • Dumbledore told William that his Egypt search for Arya Grindelwald had gone badly and that Gringotts had found entrances to three more pyramids.
  • Dumbledore asked William and Hermione to find Horace Slughorn, the only wizard besides Tom who knew the number of Horcruxes, and said Slughorn would likely welcome them.

Ch. 946You're Dating the Queen's Granddaughter?

William visited Harry at the Dursleys’ home to take him away for the summer and involve him in befriending Slughorn. After Vernon recognized William from Muggle news and asked about rumors linking him to the Queen’s granddaughter, William left with Harry, who agreed not to mention the rumors to Hermione.

  • William went to Harry’s home in Little Whinging to pick him up and prepare him to help approach Slughorn.
  • Vernon initially tried to turn William away, then welcomed him after recognizing him from news reports and asking whether the Queen’s granddaughter was pursuing him.
  • Vernon summoned Harry and treated William with unusual deference while Harry finished packing.
  • William praised Petunia’s tea, and he and Harry left the house with the Dursleys seeing them off.
  • Harry asked William about the dating rumors, and William told him not to mention them to Hermione.

Ch. 947Slughorn Under Attack

William, Harry, and Hermione went to Budleigh Babberton to persuade Professor Slughorn to return to Hogwarts as Potions Professor. Harry mistook Slughorn for a Death Eater and attacked him, leaving William to reveal that he had assaulted the very wizard they had come to find.

  • William brought Harry to Budleigh Babberton, where Hermione was watching Professor Slughorn's house under a Disillusionment Charm.
  • William explained that they were there to recruit a Potions Professor and told Harry not to mention asking Slughorn to return to Hogwarts.
  • The group found Slughorn's house wrecked, with the frightened wizard holding his wand amid the chaos.
  • Harry assumed Slughorn was a Death Eater, disarmed him with Expelliarmus, and kicked him to the floor.
  • William told Harry that Slughorn was the wizard they had come to recruit.

Ch. 948Stark, Master of the Humblebrag

Harry, Hermione, and William found Slughorn hiding in his home, where Harry mistakenly attacked him, and William treated his injuries. William tried to draw Slughorn toward Hogwarts with offers of rare ingredients and news about the war, leaving Slughorn tempted by the dragon and Giant remains stored there.

  • Harry mistook Slughorn for a Death Eater and beat him up before William treated his injuries.
  • Slughorn complained about Dumbledore tracking him and insisted he would not return to teaching during the war.
  • Hermione repaired Slughorn’s home and nearly discarded his last bottle of Dragon Blood before he stopped her.
  • William offered Slughorn free Dragon Blood from more than twenty dragons he had killed at the Battle of Buckingham Palace.
  • Hermione said Giants were stationed in the Forbidden Forest, and William revealed that he had Giant remains at Hogwarts too.

Ch. 949He Knows How to Touch My Sensitive Spots!

William manipulated Slughorn into agreeing to return to Hogwarts as Potions Professor, though he pretended he had only come to ask for a recommendation. Slughorn celebrated his expected return, then sobered up as he tried to remember what William had said before leaving.

  • William used Slughorn’s desire for comfort, useful connections, and talented students to persuade him to consider returning to Hogwarts.
  • William told Slughorn that Hogwarts needed a Potions Professor but claimed they only wanted him to recommend someone reliable.
  • Slughorn insisted he would not return, then angrily agreed to take the position after realizing William had piqued his interest.
  • William said he would speak to the Headmaster, and Slughorn boasted about how Severus, Minerva, and Filius would treat him at Hogwarts.
  • William took Hermione and Harry away by Apparition, while Slughorn celebrated before suddenly wondering what William had said.

Ch. 950First-Class Companies Set the Standards

William brought Harry and Hermione to the Burrow, where the Weasleys welcomed them and discussed Arthur’s promotion. William planned to use Arthur’s new office to regulate the wartime market and make Akali’s Mystery Shop’s products the standard; Mrs. Weasley then asked him to repair the family’s Safety Watch.

  • William and his companions passed the Burrow’s security questions before Mrs. Weasley opened the door.
  • William told the Weasleys that he had persuaded Slughorn to return to Hogwarts as Potions teacher, and Mrs. Weasley thanked him for helping Arthur get promoted.
  • William explained that Arthur’s new office could help regulate counterfeit protective products and establish Akali’s Mystery Shop’s products as market standards.
  • Mrs. Weasley worried that the family’s Safety Watch showed everyone in mortal peril, and William agreed to fix it before he and Hermione left for home.
  • Ron told Harry that William had helped secure Arthur’s promotion, while Ginny focused on writing a song and Harry felt disappointed that she did not notice him.

Ch. 951Wands in Hand, Follow Me, Kill Goblins, Seize Galleons!

After Death Eaters attacked Diagon Alley, the disappearance of Ollivander and the worsening war left wizards fearful and shopkeepers desperate to sell. William inspected the damage, planned to buy more shops cheaply, and watched Cedric’s new wand business draw customers, including a flirtatious older witch.

  • Death Eaters rampaged through Diagon Alley, leaving Gringotts untouched, and Ollivander and Florean Fortescue went missing.
  • William arrived at Akali's Mystery Shop and heard Cedric insist that the Death Eaters had taken Ollivander.
  • George suggested the Death Eaters had seized Ollivander to stop wand production, while William wondered why they had also taken Fortescue.
  • Fred told William that they had bought four shops and that Tom wanted to sell several more; William told the others to negotiate but wait before buying.
  • Cho summoned the group to the front counter, where an older witch asked Cedric to fit her for a wand at her home.
  • The witch recognized William and asked him to measure her in the changing room, but Cho pointed out the shop's no-home-visits notice.
Arc 38 of 45
Arc 38 of 45