Chapter Summaries

Su Er returned to Hogwarts and discussed Umbridge, the Ministry, and the growing threat from Riddle with Hermione and Dumbledore. Dumbledore assigned Su Er the task of persuading the Forbidden Forest’s centaurs to support Hogwarts, though there was no need to hurry.

• Hermione told Su Er that Umbridge had become the new Defense Against the Dark Arts professor and that many people doubted Harry’s account of the Dark Lord’s return.
• Su Er met Dumbledore in the headmaster’s office and criticized the Ministry’s involvement in Hogwarts.
• Dumbledore explained that werewolves, Dementors, and former pure-blood supporters had joined Riddle, leaving Hogwarts short of allies.
• Dumbledore revealed that the Forbidden Forest housed many fantastic beasts and asked Su Er to persuade the centaurs to support Hogwarts.
• Su Er accepted the mission, and Dumbledore assured him that there was still time.

As Umbridge turned Defence Against the Dark Arts into a theory-only course and punished students who challenged her, Su Er accompanied Snape to a desolate place for his first Apparition lesson. The chapter ended as Snape began explaining how to perform the spell.

• Umbridge defended her theory-only Defence Against the Dark Arts lessons, leaving students angry about lost points and Harry's detention for mentioning Voldemort's return.
• Fred and George promoted their Skiving Snackboxes to the frustrated students.
• Su Er arrived early for his Saturday appointment with Snape, who used a Disillusionment Charm before taking him away from Hogwarts.
• Snape brought Su Er to a deserted patch of land, set out two circles with his wand, and began teaching him Apparition.

Su Er learned the basics of Apparition from Snape, practicing until he could move between two marked circles despite an initial Splinching mishap. After sleeping off his exhaustion, he reunited with Hermione in the Room of Requirement and stole a kiss.

• Snape taught Su Er the three Ds of Apparition and instructed him to focus on his destination, determination, and deliberation.
• Su Er’s first attempt left a few hairs behind, but he repeatedly Apparated between the circles and gradually increased the distance.
• Snape stopped the lesson near eleven, and Su Er returned to the Castle exhausted and fell asleep in the Room of Requirement.
• Hermione arrived while Su Er slept, and he later told her that he had spent the morning learning Apparition with Snape.
• Su Er leaned on Hermione and seized the chance to kiss her, prompting her to swat him with her book.

Umbridge’s lessons were disrupted by strange illnesses caused by the Weasley Brothers’ products, while Ron tried to rein in his brothers as a prefect. Harry arrived in the common room with a wound from Umbridge’s enchanted quill, and Ginny urged that Professor McGonagall be told.

• Students suffered mysterious nosebleeds and vomiting in Umbridge’s classes, and the professors recognized the Weasley Brothers’ products as the cause but kept quiet.
• Professor McGonagall tasked Ron with controlling Fred and George, who mocked his authority while handing out experimental sweets to first-years.
• Ron threatened to write to Mrs. Weasley, and Fred and George dragged him away to avoid a Howler.
• Harry entered the common room pale and thirsty, with a raw wound on his hand from Umbridge’s enchanted quill.
• Harry explained that Umbridge had made him write “I must not tell lies” with the quill, and Ginny demanded that Professor McGonagall be informed.

After Harry told Ginny and the Weasleys about Umbridge’s blood-quill detention, Fred and George devised a plan to steal the quill by getting Ron to act. Meanwhile, Hermione began planning to free the House-elves by making them clothes, and Su Er realized she had misunderstood how wizard gifts could free them.

• Harry stopped Ginny from reporting Umbridge because he thought she would deny the accusation and make excuses.
• Ginny told Ron, Fred, and George about Harry’s detention, and Fred and George focused on how to get Umbridge’s quill.
• Fred and George persuaded Ron to take part in a plan to steal the quill, despite his initial protests.
• Su Er noticed Hermione had been distracted and learned that she planned to make clothes and gifts for the House-elves to free them.
• Su Er realized the House-elves would need to accept the gifts willingly from their own masters, but decided to ask Kleis to make sure they treated Hermione’s efforts kindly.

Su Er enlisted Kleis to encourage the house-elves to accept Hermione’s hat-making efforts, then watched the Weasley brothers’ scheme unfold as Ron lured Umbridge into chasing a Slytherin student. The plan appeared to be succeeding, though Su Er was left gagging from the Dungbomb’s stench.

• Su Er asked Kleis to persuade the other house-elves to treat Hermione’s planned gifts as a gesture of goodwill, and Kleis agreed.
• Su Er encountered Ron escorting Umbridge and heard Ron flatter her while she complained about animals in the castle.
• A student threw a Dungbomb into Umbridge’s office, and Ron chased the supposed thief with spells while Umbridge pursued them.
• Su Er hid and recognized the chase as part of the Weasley brothers’ plan to trouble Umbridge and Slytherin, help Harry escape detention, earn Gryffindor points, and obtain Umbridge’s quill.
• After Umbridge ran past, Su Er emerged from hiding and retched from the Dungbomb’s overpowering smell.

Su Er visited Hermione in the Room of Requirement, where she was knitting hats for house-elves and their families, then heard the Weasley Brothers recount their successful scheme against Umbridge. Umbridge eventually identified the Weasley Brothers as the makers of the Dungbombs but found no evidence tying them to the attack, and she vowed to retaliate.

• Su Er found Hermione knitting hats for house-elves and their children in the Room of Requirement, and Hermione remembered she still had an Astronomy essay to write.
• The Weasley Brothers told Harry, Ron, Ginny, Hermione, and Su Er that their plan had disrupted Umbridge's office, ended Harry's detention, and earned Ron fifty points.
• Hermione warned Fred and George that Umbridge might uncover their involvement, and they agreed to keep a lower profile.
• Umbridge moved to another office after Dungbombs made her Defence Against Dark Magic Office unusable and ruined several portraits.
• Umbridge traced the Dungbombs to the Weasley Brothers but found no evidence that they had attacked her office, then vowed to get even.

Fred and George improved Umbridge’s enchanted quill so that anything written with it appeared on the hair’s owner, then gave Harry Umbridge’s hair to complete his revenge. Harry used the quill to humiliate Umbridge and destroyed the evidence, while Hermione worried about the consequences.

• Harry helped Angelina look for a new Gryffindor Keeper and practiced with Ron as Ron prepared to try out.
• Fred and George showed Harry how their modified quill made written words appear on the face of the person whose hair it had absorbed.
• The brothers gave Harry Umbridge’s hair and urged him to use the quill for revenge, then dispose of it without leaving evidence.
• Harry wrote with the quill during a Defense Against the Dark Arts lesson and burned it after class, leaving “I’m a toad, ribbit, ribbit~” on Umbridge’s face.
• Hermione suspected Harry was responsible and warned him about being caught, but Ron defended the plan and Su Er stopped Hermione from arguing further.

Umbridge became Hogwarts High Inquisitor and searched the Gryffindor Common Room for evidence against Fred and George Weasley. Unable to prove their involvement in her humiliation, she questioned them and left to find Harry, while Su Er took the opportunity to go meet Hermione.

• Students heard that Umbridge had left Hogwarts, then learned she had been appointed High Inquisitor by the Ministry of Magic.
• Umbridge claimed authority to enter any Hogwarts room and searched the Gryffindor Common Room.
• Umbridge questioned Fred and George about dangerous inventions, but they denied wrongdoing and asked which rules they had broken.
• Umbridge asked where Harry was, and a student told her he was at the Quidditch Pitch.
• Umbridge left without evidence against Fred and George, while Su Er watched her lose her pleasant expression.
• Harry and Ron returned scowling after Umbridge interrupted their Quidditch practice, and Su Er left the common room to find Hermione.

As Umbridge’s intrusive searches and useless Defence Against the Dark Arts lessons frustrated Hogwarts students, Hermione proposed forming a self-study group and persuaded Su Er to teach it using Polyjuice Potion. At the group’s first meeting in the Hog’s Head, Su Er recognized a hooded witch by her distinctive feet and familiar cheap tobacco scent.

• Umbridge continued investigating Hogwarts professors and searching students’ common rooms while teaching only from Defensive Magical Theory.
• Hermione suggested a self-study group so students could prepare for their O.W.L.s and learn practical Defence Against Dark Magic.
• Hermione revealed that she had brewed Polyjuice Potion in an abandoned bathroom so Su Er could secretly serve as the group’s instructor, and he agreed.
• Hermione arranged the group’s first meeting at the Hog’s Head during Hogsmeade Weekend.
• Su Er noticed a witch sitting by the fireplace and recognized her as someone connected to the Black Family Home from her large feet and cheap tobacco scent.

Hermione gathered students at the Hog's Head to organize practical Defence Against the Dark Arts lessons because Umbridge was not teaching them useful skills. She told the group that Voldemort was back.

• Harry questioned Hermione about bringing her pet, Su Er, to the pub, and she explained that the group was meeting to study.
• A large crowd of students from several houses arrived at the Hog's Head, including Cedric Diggory and Cho Chang.
• Hermione addressed the gathering and criticized Umbridge's lessons for offering theory instead of practical Defence Against the Dark Arts.
• Hermione proposed that the students train themselves to cast spells that could protect them in danger.
• Hermione declared that Voldemort was back.

Harry explained why he believed Voldemort had returned and defended Hermione’s plan for a Defence Against Dark Magic study group. When Zacharias challenged his qualifications, Harry demonstrated the Patronus Charm, leaving the group with proof that he could teach them.

• Zacharias Smith questioned whether Voldemort had returned and demanded evidence.
• Harry recounted the night he lost Su Er and said he would not keep trying to convince those who refused to believe him.
• Hermione proposed organizing a Defence Against Dark Magic study group, but Zacharias challenged who would teach it.
• Ron, Neville, Susan Bones, Justin, and Cho Chang cited Harry’s and Cedric’s experience in support of them as teachers.
• Harry cast a silver stag Patronus in front of the group, demonstrating his skill and silencing Zacharias.

Hermione organized the students into a secret Defence Against Dark Magic study group, and Cedric persuaded them to prioritize training over Quidditch. After the meeting, Ginny invited Harry to Honeydukes while Michael Corner showed interest in her.

• Hermione proposed weekly Defence lessons and said Harry would teach the Patronus Charm if their secret teacher proved ineffective.
• Cedric urged the students to put defensive training before Quidditch, and Neville shared that he had personally experienced the previous war.
• Hermione arranged for the group to meet somewhere in the castle and had everyone sign a parchment to keep the study group secret.
• Hermione secured the signed parchment in a locked box inside her expanded bag, and the meeting broke up.
• Ginny invited Harry to Honeydukes, Ron joined them, and Su Er watched Michael Corner's interest in Ginny.

Hermione returned to the Hog's Head with Su Er, who exposed Mundungus disguised as a witch and learned that several people had been watching the pub. Su Er asked Mundungus to obtain a magical mask for the planned study group, leaving Mundungus to deliver it that night.

• Hermione returned to the Hog's Head with Su Er, who revealed himself and greeted Aberforth.
• Su Er recognized the disguised witch as Mundungus by his smell and large feet, and Aberforth confronted him for entering the pub.
• Su Er stopped Aberforth from attacking Mundungus and learned that Dumbledore had sent him to watch over them.
• Mundungus identified the bandaged wizard as Willy Widdershins, who was working for Fudge and Umbridge, and reported that the other two wizards had markings on their arms.
• Su Er asked Mundungus to obtain a magical mask that could change a person's face and voice, and Mundungus agreed to deliver one that night.

Hermione worried that Umbridge had learned about the Defence Against Dark Magic group, but Su Er reassured her that Dumbledore would support the students. Umbridge then banned student groups, while Hermione prepared the first meeting and Su Er tested a disguise pin, ending in a playful chase with Hermione.

• Hermione told Su Er that Mundungus Fletcher had heard about the group, and Su Er said Dumbledore would know and would not stop students from learning.
• Umbridge posted a decree banning student groups and requiring approval for gatherings of three or more people.
• Hermione assured Harry and Ron that her enchanted contract would punish anyone who informed on the group, then scheduled its first meeting for Wednesday evening.
• Su Er received and tested a pin that changed his face and voice, and Hermione laughed at his mismatched appearance.
• Su Er chased Hermione around the Room of Requirement after she teased him, and she begged him to stop as the room turned off the lights.

Hermione gathered Harry and the Weasley children in the Room of Requirement for Defence practice, then revealed that their mysterious instructor was Su Er disguised as Professor Aibo. Professor Aibo entered the room and introduced himself as a former Hogwarts student returning to teach them.

• Hermione showed Harry and the Weasley children how to enter the Room of Requirement by walking three times along the wall while thinking of a practice room.
• Hermione let the group members into the room, then dried Neville and Hannah after Peeves had soaked them with water balloons.
• Hermione waited outside and addressed Su Er, who had taken Polyjuice Potion and appeared as a burly man with shoulder-length blond hair.
• Su Er told Hermione to call him Professor Aibo, and she welcomed him to Hogwarts.
• Professor Aibo entered the arranged practice room and thanked Miss Granger for letting him return to his old school.

Su Er, posing as Professor Aibo, reassured the students that Dumbledore knew about their secret group and challenged them to test his teaching ability in a duel. He calmly dodged every spell from seven young wizards, then left them stunned with a taunt.

• Zacharias Smith questioned Su Er’s identity and motives, but Hermione claimed Dumbledore knew about the group, and Su Er said Dumbledore had wanted him to teach Defense Against the Dark Arts.
• Smith challenged Su Er to prove he was skilled enough to teach, so Su Er proposed a duel and invited the students to attack him together.
• Smith, Fred, George, Cedric Diggory, and three other young wizards stepped forward, while Hermione agreed to referee.
• Hermione started the duel, and Su Er dodged the spells cast at him without raising his wand.
• Su Er returned to his original position and asked the seven wizards, “That was it?”

Su Er faced seven young wizards in a duel to prove he was qualified to teach them, effortlessly defeating them with superior skill and nonverbal magic. He left Zacharias Smith as the sole opponent, poised to continue the fight.

• Cedric took charge as the seven young wizards planned a coordinated attack, but Su Er dodged their spells with ease.
• Su Er outmaneuvered the group’s tactics and caused Fred and George to knock each other down with their own Stunning Spells.
• After Cedric’s team abandoned its plan, Su Er silently cast three spells that dropped three more young wizards.
• Su Er broke through Cedric’s Shield Charm by hiding a nonverbal Petrificus Totalus beneath a visible Stunning Spell, knocking Cedric down.
• Su Er asked Zacharias Smith whether the duel had proved his teaching qualifications, then prepared to attack as Smith tried to stop him.

Su Er led the young wizards in organizing a secret Defense group and explained why they needed to avoid a name that could implicate Dumbledore. He began their first lesson by emphasizing the importance of a wand and asked whether they had truly learned the Disarming Charm.

• Su Er taught the gathered students not to trust an opponent who still held a wand, then released Zacharias Smith after keeping him immobilized as punishment.
• The students chose Harry to lead the group when Su Er could not attend their lessons.
• Hermione and the others settled on the name Defence Against Dark Magic Association, or D.A., after Su Er warned that calling it Dumbledore's Army could give the Ministry evidence against Dumbledore.
• Neville identified a wand as a wizard's most important piece of equipment, and Su Er explained the limits of Wandless Magic.
• Su Er announced that he would teach the Disarming Charm and challenged the students to consider whether they had truly learned it.

Su Er, posing as Aibo, demonstrated how magical power could strengthen and precisely control spells while teaching the young wizards not to underestimate basic magic. The Weasley twins eagerly asked to learn the techniques.

• Su Er selected Zacharias Smith to defend against his Disarming Charm, and Smith prepared a Shield Charm and other protections.
• Su Er's Disarming Charm blasted Smith across the room and knocked away his wand, after which Su Er revived him and explained the spell's knockback effect.
• Su Er warned that powering a spell with too much magic could exhaust or overtax a wizard, then demonstrated splitting a spell to disarm many wizards at once.
• Su Er showed how compressing magical power made a Reductor Curse strong enough to shatter a dummy, then restored both dummies with Reparo.
• The Weasley twins shouted that they wanted to learn the techniques.