Recaps

Li Weide and Tom uncovered Slytherin’s hidden study and learned of a dangerous creature intended to purge Hogwarts, while Li Weide continued building influence and experimenting with a collared Dementor. The arc ended with Dumbledore and Dippet discovering the Chamber of Secrets entrance and planning to ask Tom to open it.

• Grindelwald gained students’ trust through his visits and proposed an Ideological and Moral Education Class, while Li Weide warned Dumbledore that he meant to influence Hogwarts and agreed to counter him through the Mutual Aid Society.
• Li Weide sent Tom to speak with Grindelwald, then took him on a midnight expedition to Slytherin’s Secret Study, which Tom opened with Parselmouth.
• Li Weide and Tom survived Slytherin’s trials, found Nokuto Gaunt’s letters and remains, and learned that Slytherin had made Combat Puppets using the souls of Muggle knights.
• Tom cast Crucio on Li Weide to open a sealed door, and they discovered Slytherin’s plan to awaken a creature and purge Hogwarts of students he considered unworthy.
• Li Weide and Tom reported the discovery to Dumbledore and Headmaster Dippet, who kept the study secret from Grindelwald, and they buried Nokuto Gaunt in the Forbidden Forest.
• Li Weide gained Filius Flitwick’s support for his plans, recruited capable allies, and obtained a powerful Dementor from Grindelwald by proving he could control it with a Goblin Collar.
• Li Weide used the Dementor to help Tom learn the Patronus Charm, and Tom eventually produced a powerful, if blurry, Patronus.
• Dumbledore and Headmaster Dippet discovered the Chamber of Secrets entrance and planned to have Tom open it without waking the Basilisk, while Li Weide sent the Dementor back to Azkaban.

Li Weide killed the Basilisk, encountered Salazar Slytherin’s ghost, and helped Nagini return to human form. As Grindelwald’s threat drew closer, Li Weide prepared his comrades and began daily combat training with Dumbledore, while Nagini arrived at the Hog's Head Inn.

• Dumbledore and Headmaster Dippet brought Tom to the Chamber of Secrets, where Li Weide killed Slytherin’s Basilisk while the others watched.
• Li Weide took Basilisk materials for research and encountered Salazar Slytherin’s ghost in the Wizard Tower.
• Li Weide told Slytherin that his descendants had abandoned pure-blood ancestry, then negotiated a ghost contract and learned that Slytherin’s tomb was empty.
• Li Weide and Senior Sister devised a way to remove Nagini’s Beast Soul’s consciousness and return its power to Nagini’s human soul.
• Nagini regained human form, joined Li Weide’s cause, and began learning to use magic under his guidance.
• Li Weide researched combat puppets and protective Basilisk-hide suits as Dumbledore prepared him to face Grindelwald.
• Dumbledore defeated Li Weide in their first duel, then began training him daily in combat and warned him not to underestimate opponents.
• Nagini rode the Knight Bus to the Hog's Head Inn, where Aberforth recognized her and led her to the back.

Li Weide saved Aurelius, studied the Obscurus, and helped Slytherin regain the ability to handle objects. Strange doubles appeared in the Forbidden Forest, leading Li Weide to connect the disruptions to Parallel Worlds and uncover clues about Senior Sister and Slytherin’s past.

• Nagini and Aberforth asked Li Weide to save Aurelius, and Li Weide drew out Aurelius’s negative emotions before Dumbledore and Aberforth extracted the weakened Obscurus.
• Li Weide absorbed the Obscurus’s violent residue, fought Dumbledore and Grindelwald, then awoke to learn Aurelius was recovering and received the extracted Obscurus for research.
• Helena told Slytherin that she had stolen Rowena Ravenclaw’s diadem, and Li Weide used the Obscurus to make Slytherin’s cane tangible so he could confront Baron.
• Li Weide proposed breeding Basilisks abroad with Slughorn, while Grindelwald moved Dark Creatures into the Forbidden Forest and clashed with the centaurs over attacks and missing creatures.
• Li Weide made Obscurus-powered robes for Slytherin and learned from him about ruthless dueling, hidden weapons, and a rune that could help Muggle weapons pierce magical defenses.
• Li Weide and Dumbledore investigated a chaotic magical field, encountered identical Obscuruses and doubles, and found that dispersing Grindelwald’s Dark Creatures stopped the strange incidents.
• Li Weide theorized that people from Parallel Worlds had crossed over, then concluded that Senior Sister’s soul and body had been separated by a magical backlash that erased her original memories and name.
• After Dumbledore discovered Slytherin’s fresh chicken droppings, Li Weide told Slytherin about the strange events, and Slytherin questioned whether he was truly dead because he could learn new Dark Arts.

Li Weide took control of Grindelwald’s dangerous trials, reshaped them with safer challenges, and watched Tom endure the seventh-year course. After the term ended, Li Weide bought a Vanishing Cabinet and a derelict house in Knockturn Alley to establish a hidden laboratory.

• Slytherin and Li Weide found Slytherin’s empty coffin, and Dumbledore caught them in the Forbidden Forest as Slytherin prepared to investigate his past.
• Dumbledore agreed to train Li Weide and Tom, while Slytherin’s Study became their laboratory and Li Weide began experimenting with Basilisk DNA.
• Li Weide intervened in Grindelwald’s clash with his counterpart from a Parallel World, claimed the Elder Wand, and signed a Magic Contract giving him control of the trials.
• Li Weide and Dumbledore negotiated changes to the trials, removing fatal-cursing creatures and adding rescue measures and Combat Puppets.
• Li Weide developed illusion-based challenges and Combat Puppets, while Dumbledore sent his Gubraithian Fire Energy Core research to Nicolas Flamel for advice.
• Tom cleared the seventh-year course, enduring its armed Combat Puppets and suffering serious injuries before the students celebrated his achievement.
• After the end-of-term feast, Li Weide went to Knockturn Alley, bought Borgin’s Vanishing Cabinet, and paid two hundred Galleons for a derelict house.
• Once Mr. Borgin left, Li Weide kicked in a neighboring door and announced a robbery.