Chapter Summaries

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.

Zelanis’s new Imperial technology routed Harken’s Chaos vanguard and shattered Abaddon’s confidence, driving him to challenge Horus directly. Beneath Vigilus, Horus and Kaldia advanced toward the Crawling Patriarch’s lair in the Four-Armed Emperor’s cult territory.

• Alcato’s Iron Fist battlegroup destroyed the Orks’ largest war machines, while Astartes armed with Storm Mk-III Gauss Impact Rifles devastated their ranks.
• Al Khan’s Dawn fleet used Ghost Void Shields, Phase Torpedoes, and coordinated hit-and-run tactics to rout Harken’s vanguard fleet.
• Abaddon heard the voice that stirred his buried loyalty to Horus, killed a sorcerer who reported the troops were wavering, and ordered his forces to converge for a duel with Horus.
• Kaldia told Horus that they had reached the heart of the Four-Armed Emperor’s cult territory and that the Crawling Patriarch was in a Holy Cocoon cathedral three kilometres ahead.
• Horus sensed the cultists’ despair and recognized it as fuel for primordial fire.

Horus and his squad found the Genestealer Cult’s gathering place, where he used [Primordial Fire] to turn thousands of cultists against the Hive Mind and toward him. After confronting Bishop Tyrantis Primus, Horus faced the Crawling Patriarch as it launched a devastating attack.

• Horus interrupted Bishop Primus’s sermon and faced a charge by thousands of cultists.
• Horus unleashed [Primordial Fire], showing the less-transformed cultists their enslavement and their fate as the Hive Mind’s biomass.
• Thousands of cultists dropped their weapons, knelt before Horus, and rejected the Crawling Patriarch.
• Horus appeared behind Bishop Tyrantis Primus and threatened him as his power overwrote the cult’s psychic links.
• The Crawling Patriarch leapt from the altar and attacked Horus with a psychic storm and corrosive fluids.

Horus killed the Crawling Patriarch and Bishop Tyrantis Primus, then ordered the surviving cultists to fight for the Emperor on Vigilus. In the command center, Calgar defended the operation’s results against Katavonus’s accusations, leaving the inquisitor speechless.

• Horus killed the Crawling Patriarch with the Talon of Horus, reducing him to charred grease.
• Horus broke Bishop Tyrantis Primus’s arm and beat him to death after he attempted the Genestealer Kiss.
• Horus declared the cultists’ old god dead and sent them to fight the Orks and traitors as a chance at redemption.
• Calgar received a report that Horus and twenty Royal Guards destroyed the cult’s command structure in under ten minutes with no friendly casualties.
• Katavonus accused Horus of replacing one heresy with a dangerous cult of personality, but Calgar challenged him to say what mortal lives were worth, leaving him speechless.

Prophet Khaeltok sensed a new fate-thread belonging to Horus, while Horus launched a plan to destabilize the Ork WAAAGH! by killing its biggest Warboss. Horus confronted Kroodaka "the Beast" in the Gargant factory and stopped his attack, leaving the duel poised to continue.

• Prophet Khaeltok saw a new, powerful fate-thread and ordered Quilanas to tell Commander Lhaelorl to suspend their plans and observe Horus.
• Horus surveyed the Ork forces on Vigilus and learned from Alcato that three Warbosses were sustaining the WAAAGH! field.
• Horus ordered Alcato to distract Dakkabad and Oglock while Kaldia led the shadows with him to attack Kroodaka.
• Horus entered the Gargant factory, killed Kroodaka's guards, and insulted the Warboss by calling his Gargant too small.
• Kroodaka attacked Horus with his Power Claw, but Horus stopped the blow with Worldbreaker and called him too small.

Horus killed Kroodaka, causing the Ork horde to collapse into civil war, while Alkhan’s fleet cornered Koval Nightlance’s Drukhari raiders. As the Drukhari tried to flee, the Dawn fleet’s unconventional technology overcame their stealth and pursuit maneuvers, and Alkhan ordered torpedoes launched.

• Horus shattered Kroodaka’s Power Claw, tore out his heart, and killed him, ending the WAAAGH! field.
• Dakkabad and Oglock saw Kroodaka’s corpse and turned their forces against each other to claim leadership.
• Koval Nightlance delayed the Drukhari withdrawal, hoping to raid the battlefield, but dozens of Imperial frigates surrounded his destroyer.
• Alkhan announced that the Drukhari would become part of the hunt and ordered his fleet to attack.
• Koval Nightlance’s destroyer tried to escape through the asteroid field and hide behind its shadow field, but the Dawn fleet’s Ghost Thrusters and Eye of Truth array countered its maneuvers and cloaking.
• Alkhan ordered the frigates to launch torpedoes.

Horus Lupercal’s intervention turned the battle for Vigilus into an Imperial victory, while Abaddon challenged him to a duel above the planet. Horus accepted, determined to confront his former son and offer the Black Legion’s lost souls a new life.

• Koval Nightlance died when Alkhan’s Phase Torpedoes destroyed his black destroyer, and Alkhan ordered his forces to report that the threat was cleared.
• As the Orks fought among themselves and the Chaos Fleet retreated, Calgar ordered the Imperial forces to advance and reclaim Vigilus.
• Horus returned to the Unyielding Spirit and watched the Vengeful Spirit, expecting Abaddon to come; Alcato pledged himself to the Emperor.
• Abaddon assembled Khayon, Lucius, Zek, and Typhus, then ordered a public duel with Horus above Vigilus to prove his authority as Warmaster.
• Calgar warned Horus that Abaddon’s challenge was a trap, but Horus accepted, saying he would defeat Abaddon and give the Black Legion’s lost souls a new life.

Horus left his fleet under the command of Alcato, Alkhan, and Kaldia, then faced Abaddon in a duel on an asteroid above Vigilus. After defeating Abaddon, Horus killed him and heard him call him “Father” with his final breath.

• Horus ordered Alcato, Alkhan, and Kaldia to hold Vigilus while he went alone to meet Abaddon.
• Horus and Abaddon confronted each other on an asteroid, and Abaddon attacked after calling Horus an impostor.
• Liu Zhipeng trapped Drach'nyen in his wounded left arm and battered Abaddon with three punches, disarming him.
• Horus told Abaddon that he had never understood Horus’s reason for rebelling and that he had only imitated a fallen Horus.
• Horus killed Abaddon with the Talon of Horus, and Abaddon called him “Father” before he died.

After Horus defeated Abaddon, the Black Legion surrendered and the other Chaos forces scattered or turned on one another. Inquisitor Katavonus launched a coordinated assassination attempt against Horus, but his allies intervened and stopped the first wave.

• Khayon mourned Abaddon and ordered the Black Legion to lay down their weapons, while Typhus fled, Lucius withdrew, and Zhufor attacked the Word Bearers.
• Horus turned from Abaddon's corpse toward the surrendered Black Legion, but Katavonus ordered four Officio Assassinorum assassins to strike him.
• Alkhan deflected the Vindicare's shot, Alcato blocked the Eversor, and Kaldia intercepted the Callidus's blade.
• Celestine dispelled the Culexus's null field and attacked him with the Sword of the Seraphim.
• Alcato, Alkhan, Kaldia, Calgar, and Cawl shielded Horus as Calgar angrily confronted Katavonus over the public channel.

A Cabal assassin struck Horus with an Aeldari spear designed to kill gods, and its magic began erasing his life. As his allies gathered around him in shock and grief, Horus tried to calm them and prepare to put things in order before he died.

• The Cabal assassin waited for Katavonus’s distraction and hurled a concealed spear at Horus’s heart.
• The spear pierced Horus’s armor and began destroying his flesh, resisting his Primarch healing.
• Alcato noticed Horus’s wound, and Celestine failed to heal it because the spear repelled her holy power.
• Alkhan searched for the vanished assassin while Katavonus celebrated Horus’s apparent defeat.
• Horus stopped Calgar from confronting Katavonus and said he needed to put everything in order before he disappeared.