Chapter Summaries

Horus appointed Commissar Oli to reorganize Zelanis’s mortal forces and proposed rebuilding all eighteen Space Marine Legions, including those that had fallen to Chaos. After defending the plan as a chance for redemption, he began with the Emperor’s Children and Luna Wolves, leaving the Loyalist commanders to consider his decision.

• Horus appointed Commissar Oli Commissar-General of the Zelanis Defense Force and tasked him with reorganizing its Astra Militarum and militia.
• Horus announced that he intended to rebuild all eighteen Legiones Astartes, including the traitor Legions, prompting Alcato and other Loyalists to protest.
• Horus argued that the Legions had fallen through their choices rather than their genes, and held up baby Fulgrim as proof that their genetic heritage did not make them inherently corrupt.
• Horus named the rebuilt traitor Legions the Penitent Legions and said they would redeem their forebears’ shame through loyalty and service.
• Alcato asked for time to consider Horus’s proposal, while Horus said the effort would begin on a small, supervised scale with the Emperor’s Children and Luna Wolves.
• Horus left the command room carrying Fulgrim, while the remaining Loyalists stayed behind in doubt and contemplation.

Valerian persuaded Alcato to accept the Emperor’s will and follow Horus’s new path. Fifteen years later, Zelanis had become a thriving technological power, where Malthus showcased a powerful new rifle.

• The Salamanders, Space Wolves, and Raven Guard captains defended Letorion and argued that loyalty should be judged by character, not lineage.
• Valerian said the Emperor’s will was for them to follow Horus, and that their duty was to follow, witness, and protect the new path.
• Alcato reluctantly agreed, unable to question the Emperor’s will.
• Fifteen years later, Zelanis had grown into the heart of an emerging empire, with Malthus leading its rapidly advancing Mechanicum.
• Malthus unveiled the Storm Mk-III Gauss Impact Rifle, combining Imperial, Necron, and 30K-era technologies.

After fifteen years, Horus’s Penitent Legions remained free of Chaos corruption, and Fulgrim struggled with memories of a darker self. Horus’s growing empire had become a major power, but the galaxy-wide Great Rift showed that their work was far from over.

• Horus showed Alcato that recruits implanted with traitor gene-seed had matured without signs of Chaos corruption, and Alcato admitted Horus had been right.
• Fulgrim confided to Horus that visions of his other self made him fear he might become corrupted, and Horus reassured him that he was his own person.
• Horus assembled his commanders and described the forces and industrial worlds built around Zelanis over fifteen years.
• Horus enlarged the star map to reveal the Great Rift stretching across the galaxy.

Horus announced the Dawn expedition to Vigilus and named Fulgrim Lord Regent during his absence. Fulgrim won the council’s loyalty, then farewelled Horus as the expeditionary fleet departed for the Great Rift.

• Horus declared that he would lead the Dawn expedition to Vigilus to secure the Nachmund Gauntlet and reconnect with Guilliman.
• Horus named Fulgrim Lord Regent, prompting Alcato to object that Fulgrim was too young.
• Fulgrim described his visions of the Heresy and pledged to protect the Imperium as its shield while Horus served as its sword.
• Alcato, Valerian, and the council knelt and recognized Fulgrim as Lord Regent.
• At Zelanis, Horus advised Fulgrim to trust his allies without trusting anyone completely, then boarded the Unyielding Spirit.
• Fulgrim bade Horus farewell as the battleship led the Dawn fleet away from the starport.

On Zelanis, Fulgrim struggled with the burden of governing until a psychic disturbance revealed that his corrupted counterpart had attacked Oya IV. The Daemon Primarch sensed the order and virtue of his other self, leaving the two Fulgrims poised for a confrontation.

• Fulgrim complained to Oli about his mountain of administrative work and asked to escape to the defenses.
• A cloying psychic aura struck the star system, and Fulgrim recognized it as the presence of his corrupted counterpart near Oya IV.
• On Oya IV, the Emperor's Children's Choir of Ecstasy overwhelmed the defenders with psychic corruption and devastating sonic attacks.
• The Daemon Primarch Fulgrim sensed an unfamiliar aura of order and recognized the irritating presence of his other self.

Fulgrim’s Daemon Primarch attacked Oya 4, where the newly arrived Redeemers and Zelanis forces had begun routing the Noise Marines. After Fulgrim challenged the loyal Fulgrim, a clear voice answered him from the battlefield.

• Fulgrim mocked his resurrection and prepared to confront his loyal counterpart, while Zelanis sent two hundred warships toward Oya 4.
• Twenty thousand Redeemers led by Commander Letorion landed behind the Chaos forces and opened fire on the Noise Marines.
• Letorion and the Zelanis forces turned the battle around with disciplined attacks and advanced weapons.
• Fulgrim arrived, overpowered the Loyalist Space Marines, and taunted Letorion about the loyal Fulgrim.
• An unseen speaker answered Fulgrim, saying, “I’m right here.”

Young Fulgrim confronted Daemon Fulgrim and baited him into a trap that combined Necron technology, automated weapons, and a massed assault. The Daemon Primarch was weakened and wounded, and the mortals’ attack continued with his tail pinned beneath immense gravity.

• Young Fulgrim emerged with four Adeptus Custodes guards and mocked Daemon Fulgrim, provoking his fury.
• Horus’s miniature Necron Obelisks activated a spirit-banishing field, suppressing Daemon Fulgrim’s Warp power and slowing him.
• Captain Letorion, the Custodes, and the Redeemers charged while Oli ordered automated turrets and other forces to fire on Daemon Fulgrim.
• The Custodes wounded Daemon Fulgrim’s lower left arm, drawing dark purple daemon blood.
• Archmagos Malthus’s vehicles locked Daemon Fulgrim’s tail to the ground with a thousandfold gravity field.

Daemon Fulgrim shattered the Necron Obelisk and overwhelmed the defenders, leaving Young Fulgrim to face him. Young Fulgrim called on the Emperor for help, and the Emperor heard him from the Golden Throne.

• Daemon Fulgrim overloaded and shattered the Necron Obelisk, unleashing a psychic shock wave that devastated the defenders.
• Daemon Fulgrim killed a Custodian and broke the militia as he advanced toward Young Fulgrim.
• Young Fulgrim rejected the daemon’s demand to kneel, declared himself human, and ordered the surviving forces to charge.
• Young Fulgrim caught the ancient Aquila that Letorion threw to him and prayed for the Emperor’s help.
• The Emperor heard Young Fulgrim’s plea from Terra and recognized him as the child he had once lost.

On Oya 4, the Emperor empowered young Fulgrim, who defeated Daemon Fulgrim and banished the daemon forces. The victory restored the Emperor’s Children’s honor, and Fulgrim dreamed of a peaceful family scene as the flagship returned to Zelanis.

• The Emperor’s power transformed young Fulgrim’s sword into a blade of golden light.
• Young Fulgrim struck down Daemon Fulgrim for Ferrus Manus, Lyran, and the humans he had slaughtered, then destroyed him and swept the daemons and Noise Marines back into the Warp Rift.
• Young Fulgrim collapsed from the strain, and Letorion helped him stand as he declared that they had won together.
• The battle’s aftermath recorded heavy losses among the Penitent Legions and Imperialis Militia, while Archmagos Malthus rebooted after overheating.
• News of the victory spread across Fulgrim’s worlds, and the Emperor’s Children were hailed as the Sons of the Phoenix.
• Aboard the flagship returning to Zelanis, Fulgrim dreamed of a golden wheat field and a peaceful family scene.

Horus’s fleet was dragged out of the Warp by Nurgle’s influence and discovered an ancient Death Guard distress signal on Lythera IX. Suspecting a trap, Horus chose to investigate while preparing a heavily fortified landing and reconnaissance operation.

• Alcato warned Horus that the Warp route had become unnaturally calm, and Horus ordered the fleet into assault formation.
• Nurgle’s power destabilized the Gellar Fields and pulled the Dawn expeditionary fleet out of the Warp, damaging its ships and injuring hundreds.
• The fleet detected a ten-thousand-year-old Death Guard distress signal from the toxic world of Lythera IX, and Kaldia identified it as a trap.
• Horus rejected Alcato’s recommendation to destroy the planet and decided the fleet would investigate on its own terms.
• Horus ordered Titans to clear the landing area, Alcato’s forces to build a fortified base, and Raven Guard and White Scars teams to search for the enemy.

Horus investigated an ancient monastery on Lythera IX and discovered that Mortarion had lured him there with a daemonic Anathame replica. The two prepared to fight, with Mortarion seeking to infect Horus rather than kill him.

• Horus established a fortress on Lythera IX and sent the Raven Guard to investigate a distress signal.
• Kaldia reported that the signal came from a silent, ancient monastery, and Horus went there with his Royal Guard.
• Horus found the monastery’s Death Guard, nuns, and staff petrified after their souls had been drained.
• Horus approached the glowing lantern, resisted its psychic assault, and drew Mortarion out of the shadows.
• Mortarion revealed a plague-tempered replica of the Anathame and said he intended to infect Horus.
• Horus challenged Mortarion and raised Worldbreaker for the fight.

Horus fought Mortarion in the Prayer Hall and recognized the Corrupt Lantern as part of a trap meant to infect him. Mortarion managed to scratch Horus with Silence, but the chapter ended before the Gift of Divine Corruption showed its effects.

• Mortarion’s clash with Horus sent a psychic wave through the Prayer Hall, weakening the Space Wolves and forcing the Salamanders captain to shield his squad.
• Horus fought back and mocked Mortarion for surrendering to Nurgle, while revealing that he had anticipated the trap.
• Mortarion unleashed Plague Flies and warped Silence through space, but Horus blocked the scythe’s return strike.
• The Corrupt Lantern fired a beam that briefly drained Horus, allowing Mortarion to cut his armour and touch his skin with a drop of corrupted liquid.
• Mortarion expected Horus to scream as the corruption took hold, but no agonized cry came.

Horus turned Mortarion’s poison into fuel for [Glory of Bloodshed], gaining the upper hand and preparing to banish the Daemon Primarch. Before he could strike, a flaming object crashed through the prayer hall’s ceiling as a furious voice called his name.

• Mortarion’s poison infected Horus, but Horus resisted it and grew stronger through [Glory of Bloodshed].
• Horus thanked Mortarion for the boost and battered him with Worldbreaker until Mortarion was knocked into the hall’s far wall.
• Horus approached the injured Mortarion and raised Worldbreaker for a final blow to banish him into the Warp.
• A flaming object smashed through the ceiling, and an enraged voice shouted Horus’s name.

Perturabo watched Horus overpower Mortarion before Angron arrived and charged into the fight. Horus met Angron head-on, then abruptly veered aside at the last moment.

• Perturabo analyzed Horus’s abnormal strength and concluded that Mortarion was likely to lose.
• Angron arrived in the ruined prayer hall and mocked Mortarion for failing to defeat Horus.
• Angron declared that Horus’s skull belonged to him and charged straight at Horus.
• Horus advanced to meet Angron, then veered sharply left just before they collided.

Horus drove Mortarion from the hall, then faced Angron and devised a desperate way to strike the Butcher's Nails. He held Angron in place as Worldbreaker fell toward the Nails’ central node.

• Horus struck Mortarion with Worldbreaker, breaking Silence and sending him crashing through the hall wall into the poisonous fog.
• Angron charged Horus, but his chainaxe missed and split the Prayer Hall floor, releasing magma.
• Horus recognized the Butcher's Nails as the source of Angron's strength and planned to destroy their central node.
• Horus threw Worldbreaker upward and grappled Angron, taking the full force of his charge to hold him still.
• Worldbreaker struck the thick cluster of Butcher's Nails at the back of Angron's head.

Horus overloaded Angron through the Butcher’s Nails and destroyed the Daemon Prince, then turned to face a badly wounded Mortarion. Though Horus concealed a lingering plague infection in his arm, Mortarion feared him and retreated as Horus advanced.

• Horus channeled the Worldbreaker’s energy through the Butcher’s Nails, paralyzing Angron long enough to pierce his skull with the Talon of Horus.
• Angron’s body exploded and disintegrated, while the blast hurled Horus into a wall.
• Horus refused to declare the battle over and confronted Mortarion as he emerged from the poisonous mist, badly wounded.
• Mortarion realized Horus had defeated Angron and felt fear for the first time, while Horus hid the lingering Nurgle infection eating at his left arm.
• Horus advanced on Mortarion and challenged him to settle their fight, as Mortarion backed away in rage and humiliation.

Horus defeated Mortarion by breaking his resolve and striking him back into the Warp, ending the battle. He ordered the Space Marines to clear the battlefield, treat the wounded, count their losses, and scout the planet for further threats.

• Mortarion demanded to know why Nurgle's gifts had no effect on Horus, and Horus mocked his beliefs before recounting what he had endured and invoking Nathaniel Garro.
• Horus condemned Mortarion's cowardice and promised to send him back to Nurgle's Garden, then flee to confront him there.
• Mortarion tried to escape through a hole in the wall, but Horus intercepted him, shattered his scythe, and knocked him into the Warp.
• The Salamanders captain declared the battle over as the Space Marines cheered Horus and the Emperor.
• Horus ordered the troops to clear the battlefield, treat the wounded, tally losses, and send scouts to check for other threats; Kaldia obeyed.

Horus concealed a lingering plague wound from Mortarion while Perturabo studied the battle and chose to keep observing him. On Vigilus, Marius Calgar faced mounting threats on every side as an Ork breakthrough endangered the planet’s Hive Cities.

• Horus returned to the Unyielding Spirit, found black-green fibers spreading beneath the wound on his left arm, and failed to purge them.
• Perturabo analyzed the battle recording, identified Horus’s hidden injury, and ordered his forces to withdraw and continue watching him.
• Marius Calgar surveyed Vigilus’s Ork, Chaos, Genestealer, and Drukhari threats while reflecting on the war’s toll.
• Cato Sicarius reported that Vighof Fortress had gone silent after Oglock 'Bite Spider's' tank army breached its western defenses.
• Calgar realized that Vighof Fortress’s fall would leave the Hive Cities exposed to the Orks within three days.

A vast fleet bearing the Luna Wolves emblem arrived at Vigilus, and Horus Lupercal announced that he had returned to lead the Imperium. His message reached the besieged defenders just as a wounded Cadian soldier faced imminent death.

• Calgar ordered the Iron Hands Third Company to reinforce the line, while Cawl warned that Vigilus would probably fall within ten years and Celestine insisted they could still achieve a miracle.
• A massive fleet emerged from Warp rifts at the edge of the Vigilus system, led by a Glory-class battleship bearing the Luna Wolves emblem.
• The fleet’s ships displayed signals from several loyalist Chapters, but their unfamiliar designs and immense numbers alarmed Imperial commanders, and Calgar ordered the fleet to battle readiness.
• Horus Lupercal’s image and voice bypassed Imperial communications across Vigilus, and he declared himself the Emperor’s son, Primarch of the Luna Wolves, and returned Warmaster of the Imperium.
• A wounded veteran of the Cadian 902nd Regiment heard Horus’s declaration as Orks closed in on his position at Vighof Fortress.

Horus’s fleet reignited the faith of Vigilus’s people, leaving Marius Calgar torn between accepting the apparent salvation and obeying Imperial authorities who branded Horus a heretic. Calgar refused to attack Horus and told Inquisitor Katavonus to watch as Horus prepared to assault the Orks and Chaos forces.

• A veteran saw golden light, declared his faith in the Emperor, and charged the Orks with a Chainsword as primordial fire stirred hope across Vigilus.
• Soldiers and civilians across Vigilus erupted into prayers and counterattacks, while Inquisitor Katavonus ordered Calgar to fire on Horus and the Adepta Sororitas prepared for battle.
• Belisarius Cawl praised Horus’s fleet and technology and demanded that Calgar arrange a meeting with him.
• Horus told Calgar that his fleet would attack the Orks and Chaos forces within an hour, then boarded a Stormbird with his Royal Guard.
• Calgar told Katavonus to look out the window and watch Horus work rather than attack him if the Inquisitor could not defeat their enemies without provoking civil war.