Chapter Summaries

Dreadwing Grand Master Redloss prepared the Dark Angels to hold back Horus’s overwhelming Titan force until reinforcements arrived. Meanwhile, Aisha and the Scorching Sun Titans retreated toward the walls after destroying one enemy Titan, their main weapon damaged and the Death’s Heads closing in.

• Lion El'Jonson ordered Redloss to hold Horus back at all costs while reinforcements made their way to Beta-Garmon III.
• Redloss led a thousand Dark Angels from the Diviner's Needle onto the wall and assigned warriors to take over its ground defenses as enemy Titans attacked.
• The Demonic Goddess destroyed a Ghost Fox Titan with its volcano cannon, but Aisha sensed the weapon’s Machine Spirit nearing collapse and diverted coolant to cool it.
• Aisha regrouped with the Iron Cursor, Iron Huntress, Swift Hound, Crimson Os, and Farseer as they withdrew toward the walls.
• Greta and the other Scorching Sun crew members declared they would face the Death's Heads without fear.

Aisha and the Imperial Titans fought the Ghost Fox Titans while Dark Angels defenders battled Sons of Horus drop pods at Divination Needle. Iron Huntress destroyed an enemy Warlord before being buried, and Aisha's Daemonic Goddess and Ambassador Dolores became trapped together in a deep fault as the Imperial forces fell back.

• Dark Angels veterans used the high-wall weapons to shoot down Sons of Horus drop pods, but rebel Astartes and Warp daemons stormed the defenses.
• Iron Huntress lured a Ghost Fox Warlord-class Titan into a crater and destroyed it with her volcano cannon, then was brought down by concentrated enemy fire.
• Ambassador Dolores rammed the Daemonic Goddess, and both Titans tumbled into a fault and became wedged among the rocks.
• Aisha felt her damaged Titan's pain and found that neither she nor Ambassador Dolores could move without risking a fall into the abyss.
• Ambassador Dolores taunted Aisha and challenged her to a wager, and Aisha and her crew answered defiantly.

The Sons of Horus breached the Augury Spire defenses, expecting to find the Dark Angels withdrawn, but Grand Master Redloss had prepared a deadly ambush. Redloss and the Dreadwing devastated the invaders and continued hunting survivors to hold the line as the Lion had ordered.

• The Sons of Horus scaled the walls and advanced toward the Augury Spire, finding the gun emplacements and armories deserted.
• The Justaerin captain tore open the monastery gates, but the Dark Angels gave no response as the invaders entered the hall.
• Redloss detonated explosives hidden in the statues and collapsed gateways, trapping the first Justaerin inside the hall.
• Redloss attacked the trapped Terminators and led the Dreadwing through dark corridors, using explosives and heavy weapons to inflict devastating losses.
• After declaring the enemy in the corridors destroyed, Redloss entered a concealed tunnel to hunt the remaining invaders and defend the Augury Spire line.

Horus arrived on Beta-Garmon III and personally overwhelmed the Dark Angels defending the Divination Needle. After Redloss sacrificed himself in a failed attempt to stop him, Horus destroyed the defensive line and declared that the galaxy would burn.

• Redloss learned that forty-two Dark Angels veterans had died while the Dreadwings continued fighting the Sons of Horus.
• Horus emerged from a Warp rift, crossed the battlefield, and killed a wounded Imperial Fist as he approached the wall.
• Horus confronted Redloss, destroyed his weapons, and killed him after Redloss charged in defiance.
• Redloss's grenades and black hole bomb detonated, but Horus contained and erased the black hole without harm.
• Horus unleashed his power against the Dark Angels, destroyed the Divination Needle tower, and declared that the galaxy would burn.

Lion El'Jonson sensed that Redloss and the Dark Angels had died as the Invincible Reason advanced toward Beta-Garmon III, where Horus had captured the divination spire. As Aisha escaped the collapsing abyss in the Daemoness's ejected cockpit, she witnessed Horus's sacrifice consuming the planet and saw him suddenly collapse with a massive wound.

• Lion El'Jonson told Lox that he felt Redloss and the other Dark Angels had died and their connection to him had been severed.
• Lox sensed that the Warp and material universe had fused as the Invincible Reason continued toward the fallen divination spire on Beta-Garmon III.
• The Daemoness severed its bond with Aisha and launched its cockpit toward the surface, saving her and the surviving crew from the Titan's fall.
• Aisha emerged from the wreckage and saw Horus sacrifice the astropaths and the souls of the dead, unleashing Chaos across the planet.
• Aisha saw Horus collapse with a huge wound in his armor as the Daemoness's remaining head was teleported into orbit.

Aisha awakened aboard the New Caliban and told Lox and Lion El'Jonson that Horus had been wounded and assassinated after performing a blasphemous ritual on Beta-Garmon III. Before they could learn more, the ship's scanners detected a vast fleet approaching.

• Lox and Lion El'Jonson recovered Aisha and the other surviving Titan pilots from Beta-Garmon III and treated their injuries aboard the New Caliban.
• Aisha awoke and learned that six standard Terra hours had passed since her rescue.
• Lion El'Jonson demanded that Aisha explain what had happened on the planet's surface.
• Aisha said she had seen Horus fall after something pierced his waist, and reported that he had killed the astropaths and resistance fighters before performing a blasphemous ritual.
• The New Caliban's scanning arrays detected a huge number of ships approaching.

Lox and Lion El'Jonson witnessed a dark void spreading from Beta-Garmon III that resisted their attack and began producing ghostly Gloriana-class battleships. The ships multiplied until the fleet detected more than six thousand Vengeful Spirits, leaving Lox, Lion, Jaghatai Khan, and Sanguinius unable to explain Horus's power.

• Lox and Lion El'Jonson saw a shapeless dark void consume celestial bodies and learned it could reach the Solar System within six months.
• Lox commanded the New Caliban and two other Thundercloud-class battleships to fire into the void, but their combined attack dissipated without stopping its expansion.
• The attack revealed a ghostly Gloriana-class battleship that Lox and Lion identified as the Vengeful Spirit, despite having forced Horus's fleet to the edge of the system.
• More lifeless Vengeful Spirits appeared beside the first, multiplying in disarray across the void.
• The battleships' scanners counted more than six thousand Vengeful Spirits, baffling Lox, Lion El'Jonson, Jaghatai Khan, and Sanguinius.

The Lion ordered the Imperial fleet to retreat from Beta-Garmon III after Horus summoned thousands of Vengeful Spirits and unleashed an expanding dark void. As the fleet fled toward Terra, the void swallowed a planet and left the galaxy’s fate uncertain.

• Lox and the wounded Russ urged the Lion to retreat rather than face Horus’s overwhelming fleet.
• The Lion explained that Beta-Garmon’s objective had been achieved and ordered all fleets to head for Terra.
• Lox guided the fleet away while some mortal forces remained behind on the worlds they could not or would not abandon.
• Lox speculated that the Four Gods had gathered Vengeful Spirits from different timelines to create Horus’s fleet.
• The dark void swallowed the burning planet, its Titan wreckage, and its orbital defenses as the fleeing soldiers watched.

Lox questioned Adam about what kind of existence he wanted to become, and Adam said he hoped to become human like his father. Lox welcomed Adam’s answer and considered how to secure rights for the Iron Men and Stone Men after the war without creating future conflict with humanity.

• Lox walked with Adam through the Mechanicus Ark and encouraged him to reflect on his identity and future.
• Lox considered the Iron Men and Stone Men’s place in human society and the lack of rights they had despite their self-awareness.
• Adam feared that his answer might disappoint Lox, but Lox reassured him that the question would not affect their relationship.
• Adam told Lox that he wanted to become human like him, and Lox praised him and stroked his head.
• Lox resolved to consider how the Iron Men and Stone Men could gain equal civil rights and coexist peacefully with humanity.

As the Imperial fleet fled the vanished Beta-Garmon Cluster, Lox introduced Adam to the primarchs as his chosen future leader of the Iron Men. Adam accepted his duty to protect humanity and fight for it.

• The fleet’s mortal passengers learned that the Beta-Garmon Cluster had disappeared, and fear and anger spread over the Imperium’s retreat.
• Lion El'Jonson urged his brothers not to blame the mortal soldiers for their unrest, surprising them with his concern for the weak.
• Adam watched the primarchs interact and felt an unfamiliar attraction when Sanguinius greeted him.
• Lox introduced Adam as an Iron Man with a soul and his chosen leader, explaining that Iron Men would eventually take over dangerous battlefield duties from mortal auxiliaries.
• Lox told Adam to learn from the primarchs and become humanity’s shield and spear, and Adam vowed to fight for humanity.

The battered Imperial expeditionary fleet returned to the heavily fortified Solar System, where Lox reminded Adam of Terra’s importance and prepared to discuss the coming war with Malcador and the Emperor. The dark void’s advance had slowed, buying the Imperium time before its final confrontation with Horus.

• During the voyage, Adam studied swordsmanship with Jaghatai Khan, wargaming with Lion El'Jonson, and combat lessons from Sanguinius while Lox considered how Adam could complement the Iron Men master Cogitator.
• The fleet reached the Solar System and, after verifying its identity and lowering its defenses, followed Imperial Fists ships through the minefields.
• Lox and Adam saw the Sun, and Lox told Adam that Terra was humanity’s home and the root of its civilization.
• Lox reflected on the threat of Horus’s six thousand Vengeful Spirits and learned that the dark void’s expansion from Beta-Garmon had slowed as realspace resisted it.
• The fleet began repairs and resupply, while Imperial officials reassigned retreating civilians and troops under the influence of thought-imprints.
• After addressing urgent matters, Lox went to the Imperial Palace to discuss the next steps with Malcador and the Emperor.

Lox brought the wounded Leman Russ to Terra, where the Emperor’s power purged Horus’s corruption and healed him. Russ recovered in the Throne Room as Jaghatai Khan wondered at the Emperor’s might.

• Lox left Adam on Ganymede with Aisha to teach him about Titan operation and warfare.
• Lox traveled to Terra with Leman Russ, Lion El'Jonson, Sanguinius, and Jaghatai Khan so the Emperor could heal Russ.
• Tribune Decius required the Primarchs to surrender their weapons before entering the Imperial Palace, and Lion El'Jonson complied.
• Rogal Dorn welcomed his brothers in the Throne Room, and Malcador led them to the Emperor.
• The Emperor’s psychic power suppressed Horus’s curse, allowing Leman Russ’s wounds to heal and his strength to return.
• Jaghatai Khan watched the holy light from the Golden Throne and questioned the Emperor’s might.

Malcador led Lox and the primarchs to his hidden garden, a psychic recreation of Terra’s lost natural beauty, and explained that he and the Emperor dreamed of restoring humanity’s homeworld. He admitted that even if the Emperor defeated Horus, Terra might never recover, leaving the gathered warriors to reckon with what they were fighting to save.

• After the Emperor’s power lifted the Chaos curse, Jaghatai reconsidered his doubts about the Emperor and judged his brothers’ characters.
• Malcador led Lox and the primarchs away from the hostile Custodes, while a psychic barrier stopped Shield-Captain Diocletian from following.
• Malcador revealed a secret garden depicting Terra as it had been before its ruin, and Lox asked whether he had brought a planet from another timeline.
• Malcador explained that the garden was a psychic illusion made from memories of the past and shared his dream of restoring Terra for humanity.
• Malcador admitted that Terra might not be reborn even if the Emperor defeated Horus, and the garden strengthened the primarchs’ resolve.

Malcador gathered the loyalist primarchs in his private garden so they could rest and reconnect. Lox hosted a barbecue and took photographs of the brothers, preserving a rare moment of fellowship.

• Malcador told the primarchs that he had altered time in the room so they could recover from the strain of Beta-Garmon.
• Vulkan arrived and warmly embraced Lion and the other primarchs, including Lox.
• Malcador conjured a bonfire and food, and Lox invited everyone to share a barbecue.
• Leman Russ, Jaghatai Khan, Sanguinius, Rogal Dorn, Vulkan, and Lion settled around the fire as Malcador supplied drinks.
• Lox fashioned an antique camera and took several group photographs of the primarchs and Malcador.

Leman Russ asked Lox for help replenishing the depleted Space Wolves, but Lox explained that their Canis Helix gene-seed limited recruitment to Fenris and carried the risk of the Wulfen curse. Lox said a solution might exist but would take time, leaving Russ hopeful.

• After the primarchs departed the feast, Lox distributed copies of their group photographs while the brothers returned to their duties.
• Rogal Dorn recruited Stone Men to help administer Terra's defenses, unsettling the Imperial Fists as the bionics proved highly capable.
• Leman Russ stopped Lox and asked him to find a way to rapidly replenish the Space Wolves after their heavy losses.
• Lox explained that Space Wolves gene-seed required the Canis Helix inherited by Fenrisians, and that the Helix also risked triggering the Wulfen curse.
• Lox said he might be able to help, though not quickly, and Russ eagerly urged him to proceed.

Lox explained the Space Wolves’ genetic curse to Leman Russ and revealed that a broader Space Marine Enhancement project was underway. He traveled with Russ and Bjorn to Ganymede, where Belisarius Cawl reported that he had returned with the Primaris template and willing members of the Selena Genecult.

• Lox warned Leman Russ that the Space Wolves’ Canis Helix made their genetic illness dangerous to alter and that starting anew would require new gene-seed and a new homeworld.
• Lox told Russ that Magos Land and other colleagues were working on the Space Marine Enhancement project, which also addressed the Blood Angels’ and White Scars’ genetic illnesses.
• Angie informed Lox that Belisarius Cawl had returned to Ganymede a Terran month earlier, and Russ insisted on accompanying Lox there with Bjorn.
• Lox traveled aboard the Red Alert to Ganymede, passing a vast shipyard where the Helios orbital shipyard was building gunships and planetary fortresses.
• Belisarius Cawl told Lox that he had secured the Primaris template and brought back members of the Selena Genecult who were willing to serve.

Lox received the primordial template from Belisarius Cawl, who recounted how a power struggle within the Selena Gene Cult had erupted into war on the Moon. The template had been recovered, but the fate of the cult and its hidden factions remained unresolved.

• Lox met with Belisarius Cawl, Barabas Dantioch, Arkhan Land, Leman Russ, and the Selena Gene Cult gene-witches on Ganymede.
• Barabas Dantioch handed Cawl the primordial template, and Lox confirmed it was genuine before having his Stone Men assistant store it.
• Cawl explained that Heliosa No. 54 had initially resisted surrendering the template but was later assassinated by Heliosa No. 78.
• Cawl said Heliosa No. 54 had ordered Talabvita No. 37 to hide the template if she died, and Talabvita concealed it on the Moon.
• Heliosa No. 78 rebelled against the Gene Cult and attacked Cawl’s forces, triggering an internal war as Cawl searched for the hidden template.

Lox learned that the Selenar gene cult had kept Imperial forces occupied on Luna with a blight virus and monstrous bio-engineered soldiers. After reviewing Cawl’s records, he became interested in Tarabuvita No. 37.

• Cawl explained that the search for the missing original template had diverted most of Lox’s forces, leaving Imperial Fists and mortal auxilia to fight the gene cult on Luna.
• Cawl described how the cult released a blight virus that contaminated the gene-seed of some fallen Imperial Fists, prompting him to pause the purge until the danger was contained.
• The gene witches unleashed bio-engineered Astartes copies, and Cawl said the Imperium suffered heavy losses fighting the mutated monsters.
• Lox examined Cawl’s memory device and saw the gene vats and the monstrous creatures that had overwhelmed Imperial Fists in close combat.
• Lox looked at Tarabuvita No. 37, who met his gaze without yielding, and he became interested in the Lunarians.

Lox welcomed Tarabuvita No. 37 and Belisarius Cawl to Ganymede and granted them A-class clearance, bringing them into the project to improve the Space Marines. The chapter ended with the Consortium committing its resources to the long undertaking.

• Leman Russ and the Space Wolves reacted furiously to the Gene Cult’s bio-engineered Astartes imitations, but Russ restrained them as he had promised Lox.
• Tarabuvita No. 37 argued that the Astartes had flaws and said the Gene Cult’s creations might have succeeded with Lox’s involvement.
• Lox welcomed Tarabuvita No. 37 to Ganymede and the Advanced Technology Consortium, recognizing her as a valuable researcher.
• Lox granted Belisarius Cawl and Tarabuvita No. 37 A-class clearance and access to most of Ganymede’s and the Consortium’s resources.
• Lox appointed Cawl, No. 37, and Sage Land to the project to complete the Space Marines, and the gathered attendees applauded.

As Horus's expanding dark void advanced toward the Solar System, Lion El'Jonson tried to halt it with a black hole called the High Wall, but it only slowed the darkness briefly. Humanity united to prepare for survival, with Thought Imprints helping keep the Solar System's population calm and productive.

• Lion El'Jonson used a dangerous relic to draw three stars together, creating the black hole called the High Wall as a barrier against the dark void.
• The dark void slowed near the High Wall, then continued spreading and swallowed the black hole.
• Lox judged that black holes might only work if the Dark Angels could build a Great Wall around the whole region.
• Humanity in the Solar System remained calm and joined the war effort, with Thought Imprints directing civilians and officials toward production and administration.
• Chancellor Malcador ordered Thought Imprints implanted in every bureaucrat, and broadcasts from the primarchs called on all people to unite against Chaos.