Arc 1Regulus at Hogwarts

Regulus entered Slytherin and used his unusual magical control and curiosity to stand out while cautiously building friendships and investigating magic. By the end, he had begun exploring plant magic and was watching Hermes after finding a suspicious map in his schoolbag.

Chapters 1–2525 summaries

Arc 2Regulus’s Rising Influence

Regulus advanced his magic, built alliances, and managed growing tensions among Hogwarts students while Voldemort’s influence reached further into the Black family. The arc ended with Regulus and Sirius accepting that their paths had diverged.

Chapters 26–5025 summaries

Arc 3The Black Heir’s Awakening

Regulus strengthened his magic, explored the Black family’s power and businesses, and began shaping his own approach to magic while navigating the family’s ties to Voldemort. The stretch ended with Regulus studying at the Hogwarts Library as an unknown person sat across from him.

Chapters 51–7525 summaries

Arc 4The Grey Mist Beneath Hogwarts

Regulus investigated Hermes’s curse and uncovered Daren McNeil’s attempt to open a sealed chamber beneath the Astronomy Tower. The Grey Mist escaped and trapped Regulus as Avery and Alex fled to find help, while Regulus’s Patronus appeared.

Chapters 76–10225 summaries

Arc 5The Plague Wand and New Paths

Regulus survived the Grey Mist, learned from Dumbledore that light could make it recede, and expanded his spellcraft while training and studying at Hogwarts. After returning home for Easter, he practiced Fiendfyre with Orion and went back to Hogwarts more capable but still seeking the power to choose his own path.

Chapters 103–12825 summaries

Arc 6The Black Heirs Tested

Regulus used a Slytherin faction’s provocation to establish the Black family’s authority, then returned home and showed Orion the reach of his developing Space Magic. The arc ended with Orion arranging focused training for both brothers, while Sirius began questioning his own path.

Chapters 129–15325 summaries

Arc 7The Severing Charm

Regulus contained Voldemort’s Dark Enlightenment, developed the Severing Charm from Mandrake magic, and joined Freya von Eisenhardt in Reef Town to face Abyssal Whisper. After the attackers retreated, he spent ten quiet days patrolling and discussing magic and the future with Freya.

Chapters 154–17825 summaries

Arc 8The Abyss and the Return

Regulus joined Freya in confronting Abyssal Whisper and exploring the North Sea ruins, where he rejected a path that would sacrifice his selfhood and strengthened his trust in his own magic. He returned to Britain, resumed life at Hogwarts, and began probing the deeper principles behind magic and matter.

Chapters 179–20325 summaries

Arc 9Anchors and Ambitions

Regulus expanded his Space Magic, investigated the nature of the self, and intervened in a first-year dueling contest while advancing his experiments. The arc left him refining a Fiendfyre-powered flying device as Dumbledore and McGonagall discussed the danger of his work.

Chapters 205–23125 summaries

Arc 10Stars, Light, and Allegiance

Regulus visited Andromeda’s wedding and Nicolas Flamel, then pursued experiments with light, magic, and the mind while expanding his influence at Hogwarts. The stretch ended with Snape approaching Regulus under Rababstan Lestrange’s orders after a clash with James and Sirius.

Chapters 232–25625 summaries

Arc 11The Black Family Reckoning

Regulus strengthened his magic, trained Lily and Hermes, and maneuvered the Lestranges into acting against Lina and Samuel. He decided to confront Bellatrix at the Lestrange Christmas Banquet, while preparing for the possibility that Voldemort might intervene.

Chapters 257–28125 summaries

Arc 12The Lestrange Christmas Banquet

Regulus prepared for Voldemort’s growing influence by securing an escape through Fawkes, involving Sirius in his plans, and bringing his family to the Lestrange Christmas banquet. Bellatrix called for Purebloods to reclaim power, leaving Regulus to reckon with how little time remained before the Death Eaters acted publicly.

Chapters 282–30625 summaries

Arc 13The Ruin of Lestrange Manor

Regulus defeated Bellatrix in a duel at Lestrange Manor, drew Voldemort’s attention, and left the estate in ruins after Voldemort took Bellatrix away alive. In the aftermath, Regulus reconsidered the powers within himself while Lily, Snape, and the wizarding families reacted to the events and their consequences.

Chapters 307–33125 summaries

Arc 14Quassare and New Departures

Regulus developed Quassare from the Whomping Willow’s oscillating Magic, then demonstrated its potential to Orion and considered how the Philosopher’s Stone might enable a chain reaction. After returning to Hogwarts, Regulus entered the Slytherin Common Room and was surrounded by a group of students.

Chapters 332–35625 summaries

Arc 15Channels and Patronuses

Regulus expanded his influence at Hogwarts while exploring spatial magic, training his allies, and helping Professor Sprout restore a Whomping Willow. The arc ended with Lily making progress on her Patronus and asking whether she could become stronger than Regulus.

Chapters 357–38125 summaries

Arc 16The Werewolf’s Anchor

Regulus attended Pollux Black’s funeral, then accompanied Lucius to confront Fenrir Greyback and used his mind magic to help Edgar Tomlin resist his beastly instincts. After returning to Hogwarts, Regulus pursued new changes for Baruk and joined the detention group in the Forbidden Forest, where he studied Hagrid.

Chapters 382–40625 summaries

Arc 17Lessons and Experiments

Regulus taught his companions, altered Baruk, and pursued new magical ideas while Lily trained under his guidance. Meanwhile, Sirius and James clashed with Snape and Lily, and Regulus left McGonagall’s office with a new theory about Severing and Transfiguration.

Chapters 407–43125 summaries

Arc 18The Guardian Will Test

Regulus prepared to leave Hogwarts under a false identity, then met Dumbledore and shared intelligence about Voldemort while helping recruit Angus Kro. At the werewolf camp, Regulus and Dumbledore tested Bellatrix’s Guardian Will in Edgar, where it protected his humanity through the full moon and Dumbledore helped awaken it.

Chapters 432–45625 summaries

Arc 19The White-Haired Wizard

Regulus rescued the Pruitt brothers, drew Voldemort’s attention as the white-haired wizard, and returned to Grimmauld Place to warn his family that war was approaching. With Walburga’s gifts, he departed for France to manage Voldemort’s suspicions and handle the Black family’s vineyard problem.

Chapters 457–48125 summaries

Arc 20The Provence Raid

Regulus settled into the Black family’s Provence estate, developed Alchemical tools, and defeated a smuggling gang sent against him. After France’s Ministry agreed to handle the attack as a local crime, he visited Andromeda, while events elsewhere revealed Baruk’s immense power.

Chapters 482–50625 summaries
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