Chapter Summaries

Inquisitor Grey uncovered a Cult of the Ouroboros plot involving detailed Warp route data for the Dark Angels and Macragge's Honour. The Cultists’ goal remained unclear as Grey found no explanation for why they had linked the Thirteenth Primarch with the Dark Angels.

• Grey entered a sealed chamber where Loyalist and Cultist corpses lay and learned that Imperial forces had captured a high-ranking Cultist and decrypted seized documents.
• Grey identified the prisoner as Salad, a former idealistic political reformer who had joined the Cult of the Ouroboros after losing faith in the Imperium.
• Salad denounced Grey and refused to provide information, so Grey ordered him burned alive.
• Grey examined the documents and found Warp route maps tracking the Dark Angels’ Rock and charting routes between it and Macragge's Honour.
• Grey watched a Cult of the Ouroboros recording that foretold the return of the Elder Gods, but she could not determine what the Cultists intended.

Grey set out for The Rock to stop the Cultists’ plans for Guilliman, while Guilliman’s fleet struggled through a Warp storm that seemed designed to delay him. On The Rock, Boreas encountered a mysterious Dark Angels warrior who claimed Guilliman plotted to seize power and urged him to protect the Lion’s bloodline.

• Grey ordered the Cultists burned, left forces and officials to suppress the reforms on Hell Five, and sailed for The Rock.
• Guilliman learned from Roshan that a mysterious presence was causing severe Warp storms to delay the fleet’s arrival at The Rock by at least a month.
• Guilliman told Roshan to warn the units to follow the original plan and avoid acting rashly, then said he wanted humanity to gain control of the Warp.
• Boreas defeated a Servitor in a training bout, then confronted a Dark Angels warrior who accused Guilliman of plotting to take the Imperium’s highest power.
• The stranger identified himself as a Guardian left by The Lion and urged Boreas to save the Lion’s bloodline before vanishing without leaving any trace.

Boreas prepared to defend the Dark Angels after suspecting Guilliman might sacrifice their Chapter, while Calgar arrived at The Rock seeking the Primarch. During a security inspection of Calgar’s fleet, Cybus and disguised infiltrators attacked the Dark Angels, turning suspicion into open violence.

• Boreas decided he would fight Guilliman if the Primarch tried to destroy the Dark Angels, then armed himself in his private armory.
• Calgar’s fleet arrived at The Rock ahead of schedule, and Calgar asked Azrael for permission to board and await the Primarch.
• Azrael and Ezekiel discussed their suspicions that the Warp was delaying the Primarch’s fleet as part of a conspiracy.
• Azrael boarded the Victory Laurel with sixteen veteran Dark Angels, and Calgar discussed the Primaris upgrade and the Imperium’s crisis with him.
• During the security inspection, Cybus revealed his hostility to a Dark Angels warrior, then killed Decima with a Chainsword.
• The surviving Dark Angels warrior called for help, accused the Ultramarines of betrayal, and opened fire on them.

A Chaos plot turned the Dark Angels and Calgar’s Expeditionary Fleet against each other, while The Changeling sabotaged The Rock and spread confusion. Ezekiel tried to contain the crisis and seek talks, but the fortress remained under attack as The Changeling prepared a trap for Guilliman.

• A Dark Angel fired on Cybus after mistaking the Expeditionary Fleet for an attack force, igniting a battle between the two sides.
• A disguised warrior stabbed Azrael and shouted that he acted for Guilliman, prompting the Dark Angels to retaliate as Calgar tried to stop the fighting.
• The Dark Angels fled with the wounded Azrael, while The Rock opened fire on Calgar’s fleet and lost control of its systems after Chaos cultists corrupted its communications network.
• Ezekiel learned that The Rock’s systems were compromised and communications were cut off, ordered Dagonet to investigate Azrael’s condition and negotiate with Calgar, and prepared the Deathwing for a possible assault.
• The Changeling infiltrated The Rock, killed a Dark Angels warrior, stole his identity, and used conflicting orders to drive Imperial Auxilia and Dark Angels into further violence as it awaited Guilliman.

The Changeling broke into The Rock’s forbidden armory, armed Daemons and prisoners, and used a Golden Age weapon to clear the way toward the seal holding the Ouroboros. Meanwhile, Calgar and the Dark Angels narrowly avoided open war after exposing infiltrators, but the chapter ended as the Changeling fired at the final seal.

• The Changeling deceived the guards, killed them, and sent Daemons to distribute weapons to cultists and prisoners while it retrieved a weapon capable of erasing existence.
• Calgar authorized the Heart of Guilliman’s implantation to save Azrael and ordered the Expeditionary Fleet to withdraw rather than counterattack The Rock.
• An Alpha Legion warrior sabotaged communication and sent fighters after Dagonet’s Stormbird, but Calgar’s forces destroyed the pursuers and Dagonet helped restore contact between the two sides.
• Boreas captured the traitors preparing a Deathwing assault and revealed that he belonged to Azrael’s Hexagrammaton, but a terrifying presence then rose from The Rock’s depths.
• The Changeling killed the Dark Watchers with the Golden Age weapon, reached the final seal, and fired at it.

The Changeling broke the seal imprisoning Ouroboros, unleashing Daemons and a black hole that trapped Guilliman’s forces near The Rock. With the Dark Watchers’ contingency, Guilliman drove back the invasion, but a surviving Alpha Legionnaire tried to assassinate him, and the Dark Watchers led Guilliman to a startling discovery: Lion was there.

• The Changeling destroyed the seal, releasing Ouroboros and triggering a Daemon invasion across The Rock and Calgar’s fleet.
• Ezekiel and Calgar struggled against the Daemons as the black hole and its spatial vortex trapped the Imperial forces.
• Guilliman arrived with Imperial reinforcements, rescued Calgar, and led the counterattack against the Daemons.
• A Dark Watcher revealed a contingency device, which the Imperial forces activated to drive Ouroboros and the Daemons away.
• An Alpha Legionnaire disguised as a Sons of Vengeance warrior attacked Guilliman, but Guilliman defeated him and ordered his capture.
• The Dark Watchers led Guilliman into a hidden hall, where he found Lion.

Guilliman learned from the Dark Watchers why Lion had been lost for ten thousand years and formed an alliance with them to fight Chaos, then prepared to travel to Terra and seek a way to awaken his brothers. Luther escaped, Azrael awoke after beginning his Primaris upgrade, and Guilliman’s approach to Terra sparked panic and hostile press coverage.

• The Dark Watchers explained that Lion had crossed ten thousand years through Ouroboros’s power and could survive only inside a temporal force field, then asked Guilliman to ally with them against Chaos.
• Guilliman agreed to the alliance, learned that Luther had escaped, and persuaded Ezekiel to pursue him and share what he knew about Lion’s injuries.
• Guilliman secured the Dark Angels’ support, departed for Terra with his fleet, and planned to take control of the Beta-Garmon System on the way.
• Ezekiel began a purge of traitors and Cultists on The Rock while Azrael awoke after his body was repaired and prepared to continue his Primaris upgrade.
• News of Guilliman’s journey to Terra spread, and hostile Imperial newspapers portrayed him as a shameless traitor who would defile Terra.

Tirean learned that Yittu and the Conservative Faction planned to stop Guilliman from reaching Terra, so he secretly recruited General Hastar to help undermine their forces at Beta-Garmon. As Terra’s elites prepared for civil war, civilians such as Nava faced brutal repression amid food shortages and rising prices.

• Yittu told Tirean that the High Lords would rally forces to block Guilliman in the Beta-Garmon system and urged him to persuade the Adeptus Custodes and other hesitant factions to join them.
• Tirean agreed outwardly to serve the High Lords, then resolved to help Guilliman prevent a civil war despite his misgivings about the Primarch’s reforms.
• Tirean persuaded General Hastar to join Yittu’s forces and secretly pass defensive intelligence to Guilliman’s side, while Tirean worked to recruit other commanders.
• Terra’s merchant families exploited scarce Warp routes to raise prices, and the Adeptus Arbites burned civilians who had led protests against the trade guilds.
• Nava watched his friend die at the stake and took the man’s children home as Imperial propaganda denounced Guilliman and called on citizens to resist him.

Nava lost his job and the people who had shown him kindness were killed by the Adeptus Arbites, driving him toward the Brass Brotherhood. Meanwhile, Guilliman’s forces rescued Babu System, where signs of an abnormal Warp influence near Terra raised fears that Chaos was targeting the Emperor.

• Nava was dismissed from the Teles Water Purification Plant and rejected a recruiter for the Brass Brotherhood, while his neighbor helped him care for his friend’s two children.
• Nava found work hunting mutated animals, but returned to find the Adeptus Arbites had killed his neighbor and the children, whom they accused of treason.
• Nava fled his home and listened as another Brass Brotherhood recruiter urged him to turn his anger against the powerful.
• Guilliman led his expeditionary force to Babu System, destroyed the invading Chaos warband, and retook the planet.
• Roshan warned Guilliman that Warp influence grew stronger near Terra, and a dead Space Marine’s contaminated body spawned Flesh Spider monsters after the Warp passage had been closed.
• Guilliman suspected that Chaos powers were targeting the Emperor on Terra.

Guilliman concealed evidence of Chaos corruption on Terra, pacified the Babu System, and appointed Theok as its governor before reflecting on the Imperium’s perilous future. He then visited the imprisoned Cherubael to ask what it knew about Terra, but the daemon had no information to offer.

• Guilliman ordered Roshan to suppress news of the contaminated corpse on Terra and destroy all blasphemous evidence.
• Guilliman’s officials purged and replaced Babu System leaders, and he appointed Theok governor after praising his compassion and commitment to humanity.
• Guilliman oversaw plans for the Babu System’s reconstruction, agricultural reforms, and defense before returning to Macragge’s Honour.
• While surveying the fleet and the Great Rift, Guilliman weighed plans to confront Chaos or retreat to other galaxies and universes.
• Guidos relayed a message from Belisarius Cawl, and Guilliman then went to the dungeon to question Cherubael about Terra.
• Cherubael fawned over Guilliman but admitted it had no information about Terra.

Guilliman learned that Mortarion, Angron, and Magnus were preparing new threats, while Cherubael tried to undermine his resolve by arguing that humanity itself fed Chaos. As Guilliman pursued his plans for Terra, the High Lords assembled a vast force at Beta-Garmon to resist him, and Jorton’s Death Korps of Krieg prepared to fight for the Emperor.

• Cherubael reported that Mortarion was advancing with a Plague Fleet and a world-corrupting pathogen, Angron had left the Eternal Battlefield, and Magnus was building an empire of Psykers.
• Guilliman questioned Cherubael about his origins, learned that the Daemon had once been worshipped as a god, and rejected his attempt to blame humanity’s suffering on the Warp.
• Eisenhorn warned Guilliman that Cherubael was trying to corrupt him, but Guilliman said he would remain vigilant and continued planning to reach Terra and strengthen his forces.
• Guilliman consulted Cawl’s avatar, learned that Cawl had recovered the Primordial Template and was traveling toward the Solar System, and ordered updates on his progress.
• The High Lords, the Adeptus Mechanicus, the Ecclesiarchy, and their allies gathered fleets, Titans, and fifteen Space Marine Chapters at Beta-Garmon, while their propaganda branded Guilliman a traitor.
• Jorton and the Death Korps of Krieg watched the Imperial broadcast aboard a troop transport as they arrived at Beta-Garmon, ready to die fighting Guilliman’s forces.

House Taranis, Legio Solaria, and Terra’s forces gathered at Beta-Garmon V as the Imperium prepared for war against Guilliman, while disputes over command exposed the assembled army’s divisions. Hastar worked to build opposition to the civil war, Vladimir reconsidered the Imperial Fists’ allegiance, and on Terra Nava received the Blood God’s blessing and led a massacre against the Adeptus Arbites.

• Hanto led House Taranis’s Knights onto Beta-Garmon V as Aisha awakened and prepared Legio Solaria and the Goddess of War for battle.
• Hastar received Tirean’s list of allies and uncertain commanders, then witnessed Terra’s leaders fail to agree on who would command their forces.
• Aisha silenced the arguing commanders, rebuked Caleb, and left the meeting after concluding it would achieve nothing.
• Vladimir and Lysander questioned the Imperial Fists’ participation in the war, and Vladimir ordered a meeting with their successor Chapters.
• Nava received the Blood God’s blessing, slaughtered the Adeptus Arbites who raided the Brass Brotherhood, and charged at the official he sought revenge against.

A riot led by Nava erupted into a bloody uprising before Imperium forces and the Adeptus Custodes crushed it, while Valano learned Chaos was fueling the unrest. As Guilliman prepared for a confrontation at Beta-Garmon, he recruited Celestine and Kren to weaken the forces opposing him.

• Nava led the Brass Brotherhood and desperate rioters in a revolt, killed an official, and was transformed by the Warp before the Adeptus Custodes killed him and suppressed the uprising.
• Valano learned from Valerian that the riot bore the Blood God's mark and was part of a wider conspiracy, while Terra's High Lords called for a meeting about the rebellions.
• Vladimir persuaded the Imperial Fists' successor Chapter Masters to remain neutral in the conflict between Guilliman and Terra.
• Guilliman told Celestine that Terra's forces were gathering at Beta-Garmon and convinced her to challenge the Ecclesiarchy's legitimacy and seek a peaceful split among its followers.
• Guilliman gave Kren miniature black-hole technology as an advance reward, and Kren agreed to undermine the Adeptus Mechanicus on Mars despite the danger.

Guilliman rejected compromise with Terra’s elite and prepared to crush the Beta-Garmon blockade if necessary, while Kren tried to persuade Archmagos Sigma to join Guilliman’s camp. Sigma was tempted by Kren’s offers and the Wrath Colossus’s power, then demanded more before agreeing to switch sides.

• Guilliman told Kren that his future standing depended on persuading the Adeptus Mechanicus of the Beta-Garmon System and earning his trust.
• Guilliman reviewed Beta-Garmon’s defenses and decided he would use the Wrath Colossus to destroy them rather than compromise with Terra’s elite.
• Kren returned to his Ark Mechanicus, inspected the growing God-Brain, and resolved to trade valuable knowledge for support from the Conservative Faction.
• Kren sent Archmagos Sigma an offer of knowledge, STC Templates, and a place on Guilliman’s research team, along with information about the Wrath Colossus.
• Sigma rejected Kren’s advances in anger, but reconsidered after seeing his gifts and the Wrath Colossus’s power, then replied that she demanded more.

Archmagos Sigma and Celestine helped Guilliman seize the Beta-Garmon system with little fighting, while Hastar’s forces detained the senior generals on Beta-Garmon V. Caleb ordered the Krieg Regiment to attack the Cadians, but Colonel Jorton halted the assault after seeing the Emperor’s icon and questioning whether the Kriegsmen would betray Him.

• Sigma pledged the Adeptus Mechanicus forces of Beta-Garmon to Guilliman after Kren promised her STC knowledge and a place on the Primarch’s research team.
• Celestine used the Gloriana of the Emperor’s Human Beacon to manifest the Emperor’s icon and denounce Terra’s traitors.
• Guilliman’s fleet arrived at Beta-Garmon, and Sigma disabled the Mechanicus forces while the Emperor’s icon and Guilliman’s surrender demand prompted most void forces to stand down.
• Hastar detained the senior generals at a banquet on Beta-Garmon V and prepared to secure the planet for Guilliman.
• Caleb ordered the Krieg Regiment to attack Hastar’s Cadians, but Colonel Jorton halted the assault after viewing a recording of the Emperor’s icon and hearing the Cadians challenge the Kriegsmen’s loyalty.

Caleb tried to force the Krieg regiment to attack the Cadians, but Colonel Jorton exposed his deception and had him arrested. On Terra, Guilliman’s victory at Beta-Garmon shattered the High Lords’ plans, while the unrest they had ignored summoned Daemons; Valerian and the Adeptus Custodes prepared to defend Lion’s Gate as the invasion engulfed the city.

• Caleb threatened and shot Colonel Jorton when the Krieg soldiers refused to attack the Cadians, but a confirmed recording proved Caleb had deceived them, and Jorton ordered him imprisoned.
• Tirean received a warning from Beta-Garmon and tried to send his family away from Terra as Guilliman’s forces won over the system’s troops and the High Lords learned their resistance had collapsed.
• The Blood Brotherhood’s sacrifices and Terra’s spreading famine and unrest opened the way for Daemons, forcing the Adeptus Custodes to mobilize across the Imperial Palace and Outer Palace.
• Valerian took command of a force defending Lion’s Gate and learned from a colonel that Daemons and rioters were approaching as Astropaths went mad.
• Valerian reached the city walls and saw Daemons and rioters slaughtering civilians and surging toward Lion’s Gate.

Nava led a Chaos-fueled riot toward Lion’s Gate, but Valerian killed him and Imperial forces drove back the attackers. At the Imperial Chancellery, Yittu confronted Tirean and declared that he was there to eliminate him as a traitor.

• Nava rampaged through Terra with the rioters, killing soldiers and weakening the Warp barrier as Daemons pressed toward reality.
• Valerian led the defense of Lion’s Gate and killed Nava in combat.
• Heavy Star-Fort Servitors and tanks slaughtered the rioters and drove the remaining Daemons away from Lion’s Gate.
• Tirean watched the crisis worsen, endured Warp-induced nightmares, and continued coordinating Terra’s response from the Chancellor’s Residence.
• Tirean found his guards murdered and entered the great hall, where Yittu aimed a Pulse Pistol at him and said his time had come.

Yittu confronted Chancellor Tirean over secretly supporting Guilliman, and Tirean defended his actions as necessary to prevent civil war and repair the Imperium. Yittu had Tirean tortured and left him to die, threatening to erase his family and descendants.

• Yittu showed Tirean evidence of his dealings with Hastar and accused him of betraying the Emperor and the Senatorum Imperialis.
• Tirean argued that he had acted to prevent civil war and condemned the High Lords for corruption, inefficiency, and the Imperium's suffering.
• Yittu revealed that the other High Lords planned to support Guilliman, while he intended to kill Tirean and his family without the Primarch learning the truth.
• Yittu shot Tirean in the legs, injected him with neurotoxin, and left as Tirean's screams filled the darkness.

Tirean died from neurolytic toxin after Yittu and other High Lords orchestrated an assault on the Chancellor’s Office and disguised the murder as a riot. As Terra mourned him, the Imperial Daily announced that Roboute Guilliman was nearing the Sol System and hinted that the Adeptus Arbites would pursue those who had defamed him.

• Tirean recalled his life and died in the old servant’s arms after Yittu’s death squad poisoned him with neurolytic toxin.
• The old servant hid in a secret chamber as rioters stormed the Chancellor’s residence, determined to survive and expose Tirean’s murder.
• The rioters killed and mutilated Tirean, then an explosion destroyed much of the Chancellor’s Office.
• Yittu, Draco, and Baldo watched the smoke and agreed to conceal their role while publicly professing loyalty to the Imperial Regent.
• Terra’s troops and civilians mourned Tirean, and the Imperial Daily reported that Roboute Guilliman was one week of Warp travel from the Sol System.

Valerian led a strike force to stop a Chaos blood sacrifice at a Terra factory, but the ritual’s consequences began to tear the world apart. As eighty-eight Greater Daemons of Khorne descended, Angron crossed into reality and declared that he had returned.

• Valerian assembled Yubo’s troops and aircraft to clear rioters from the Processional and attacked a blood-sacrifice gathering at a factory.
• Valerian and Yubo’s forces fought through thousands of mutated rioters, while five Grey Knights arrived to reinforce them.
• Valerian killed the corrupted Tech-priest and stopped the sacrifice, but the lead Grey Knight warned that a Warp storm had arrived.
• Valerian ordered Yubo’s troops to retreat as the factory and nearby buildings disintegrated and an earthquake devastated Terra.
• A fragment of Khorne descended, followed by eighty-eight Greater Daemons of Khorne, and Angron appeared, saying, “Father, I have returned.”