Vol. 4Hydra and the Mobile Castle

Li Weide formed Hydra, built alliances and a flying castle, and investigated the Purifiers while helping his allies confront threats rooted in Ancient and harmful magic. The Purifiers were defeated, but their attackers’ failing condition remained unexplained as Tom began studying Soul Magic.

  • Li Weide rescued Slytherin, founded Hydra with Tom, and prepared to challenge Pure-blood control.
  • Li Weide recovered Ravenclaw’s Diadem, transformed Newt’s dragon into Alduin, and left Riddle Manor with his companions.
  • Li Weide built influence among Pure-blood families and defended the Hogwarts Express from masked attackers.
  • Li Weide accepted a school award and began secretly leaving Hogwarts to search for Ancient Magic Hotspots and help the senior female student escape.
  • Li Weide broke the Nightmare Magic curse that had made Tom and others forget him, then freed the senior female student, whom he named Miravia.
  • Grindelwald told Li Weide and Dumbledore that the Purifiers had allied with Pure-blood families, and Li Weide questioned whether their captured attacker had been sacrificed.
  • Li Weide completed the Mobile Castle, strengthened allies with Pure Magic Power, and joined the raid that defeated the Purifiers.
  • Li Weide found that captured attackers shared an Azkaban prisoner’s failing condition while Tom began training in Soul Magic.
Chapters 301–400 Read from ch. 301

Arc 13Hydra Takes Shape

Li Weide rescued Slytherin, drew Andrews and Ilena into his plans, and founded Hydra with Tom as its first member while preparing to challenge the Pure-blood families’ control. After recovering Ravenclaw’s Diadem and transforming a dragon into Alduin, Li Weide left Riddle Manor with his companions to pursue new experiments.

  • Li Weide followed a signal to an ancient tomb, rescued Slytherin from its traps, and escaped with Andrews before defeating the Soviet Aurors sent after them.
  • Li Weide returned to Riddle Manor, uncovered Ilena’s identity and her father’s crimes, and helped Andrews commit to taking revenge by challenging Yuriyev’s power.
  • Slytherin fought Tom, who used his basilisk and a revolver to win the duel, then began secretly training with him while Li Weide developed a fast broom powered by a Gubraithian Fire Energy Core.
  • Li Weide explained how Pure-blood families monopolized opportunities and resources, then founded Hydra with Tom as its first member and taught him that the organization should serve a shared belief.
  • Li Weide and Slytherin recovered Ravenclaw’s Diadem in Albania, where Li Weide also helped Newt defeat poachers and free a rare dragon.
  • Using the Diadem’s insights, Li Weide created the Hogyoku, a microscope, and an improved Energy Core, then transformed Newt’s dragon into a Hungarian Horntail and named it Alduin.
  • Li Weide left Riddle Manor with Andrews and the others while Slytherin stayed to train Tom, and Alduin grew to full size at their North Sea camp as Li Weide considered a new use for the Energy Core.
Chapters 301–325 Summaries Read

Arc 14The Train Ambush

Li Weide built influence among the Pure-blood families while preparing his plans for reform, then defended the Hogwarts Express from a masked attack. After receiving a school award, he prepared to leave Hogwarts secretly to search for Ancient Magic Hotspots and help the senior female student escape.

  • Li Weide developed his flying castle plans, gathered allies and funding, and let the Pure-blood families believe a powerful Li family stood behind him.
  • Li Weide helped arrange Ilena’s transfer to Hogwarts and promised to support her pursuit of justice against her father without letting her kill him.
  • Li Weide formed a partnership with the Malfoy Family, raised funds for his research, and brought Hagrid into the Mutual Aid Club on the Hogwarts Express.
  • Masked wizards attacked the train, and Li Weide fought them with Ancient Magic, illusions, and metal shards before capturing the group.
  • Li Weide discovered that Minister Fawley had ordered the prisoners taken away, while Dumbledore warned him that a coalition might be targeting him for his secrets.
  • After the students reached Hogwarts, the senior female student gave Li Weide maps and a detector so he could search for Ancient Magic Hotspots and help her escape.
  • Li Weide arranged to use Nightmare Magic to conceal his absence while Dumbledore agreed to keep Grindelwald away from Hogwarts.
  • At the school award ceremony, Li Weide accepted the Special Award for Services to the School, then began turning illusory as he declared that he was already finished.
Chapters 326–350 Summaries Read

Arc 15Miravia’s Return

Li Weide returned to Hogwarts to save Tom from runaway Nightmare Magic, then freed the imprisoned senior female student and learned that Ms. Paris was Helga Hufflepuff. The story left Li Weide and Dumbledore investigating the Purifiers and their alliance with Pure-blood families.

  • Li Weide traveled with Slytherin to investigate ancient magical sites while Nightmare Magic caused Tom and those around him to forget Li Weide’s existence.
  • After Tom disappeared, Li Weide learned that Tom’s emotional resistance had amplified the Nightmare Magic, found him at the North Sea, and broke the curse.
  • Li Weide returned to Hogwarts, organized Hydra’s training and recruitment, and prepared to free the senior female student from her Crystal Coffin.
  • Li Weide absorbed some of the senior female student’s Residue and helped her awaken, but she took his Beech Wand and flew away before returning.
  • Ms. Paris revealed that she was Helga Hufflepuff, reunited with Slytherin, and offered to help the awakened student reconnect with her old friends.
  • Li Weide named the freed student Miravia, and she left with Ms. Paris to explore the world while Slytherin stayed behind.
  • Grindelwald told Dumbledore and Li Weide that the Purifiers had re-formed and allied with Pure-blood families, while Li Weide questioned whether their captured attacker had been deliberately sacrificed.
Chapters 351–375 Summaries Read

Arc 16The Mobile Castle and the Purifiers

Li Weide built a flying castle, strengthened his allies with Pure Magic Power, and helped Grindelwald uncover and defeat the Purifiers. The attackers’ unnatural magic remained unexplained, while Li Weide returned to studying its harmful effects and Tom began training in Soul Magic.

  • Li Weide visited Azkaban with Tom, Annie, and Andre, uncovered the Purifier prisoner’s hidden memory, and helped Tom’s family move to the Safe House.
  • Li Weide recruited House-elves, established a Basilisk-breeding site in Ethiopia, and gave Tom and several allies capsules of Pure Magic Power.
  • Li Weide learned that Ravenclaw’s Diadem held her copied consciousness, then completed his Mobile Castle and raised it into the air.
  • Miravia and Nagini moved into the Mobile Castle, and Li Weide removed Miravia’s Residue and restored her strength with Pure Magic Power.
  • Tom rejected Li Weide’s Basilisk-inspired killing spell, chose to learn Soul Magic, and trained with Li Weide before Grindelwald located the Purifiers.
  • Grindelwald, Dumbledore, Li Weide, Tom, Miravia, and Nagini joined the raid, where Tom fought alongside the adults and Li Weide helped him bring down an enemy.
  • Li Weide, Dumbledore, and Grindelwald broke the Purifiers’ formation with a Weather Charm, and Li Weide discovered the captured attackers shared the Azkaban prisoner’s failing condition.
  • Li Weide investigated the dissipating magic in the Mobile Castle as the Ministry arrested prominent pure-blood wizards, Miravia became deputy head of the Department of Mysteries, and Tom brought him Grindelwald’s combat memories.
Chapters 376–400 Summaries Read
Volume 4 of 6