Chapter Summaries

Lox gathered an Ultramarines company and its mortal support staff aboard the Red Alert, then took them to Mustafar to deploy an ancient MCV. The vehicle transformed into a clean, advanced complex, leaving Hill and the other Ultramarines amazed.

• Hill assembled the Ultramarines company and its attached personnel, including Nykona, while he and Nykona joked with Lox about power armor.
• Lox promised that Nykona would see the improvements in his planned power armor, then ordered the Red Alert to depart for Mustafar.
• Lox piloted the Red Alert through Mustafar’s toxic atmosphere and landed on the barren, storm-wracked surface.
• Lox ordered the shipboard AI to activate the war protocol, and the awakened MCV drove out of the Red Alert.
• The MCV transformed into a technologically advanced complex, astonishing Hill and the other Ultramarines.

Lox used the war base’s technology to rapidly build industrial facilities and transform Mustafar’s toxic environment, while Hill and Wayland discussed the risks of AI and the Adeptus Mechanicus. The planet’s terraforming began, but it still needed magnetic generators to retain its new atmosphere.

• Lox ordered the war base to build a power plant, an ore refining center, and a planetary control tower, and automated mining and production began.
• Wayland warned Lox that the Adeptus Mechanicus banned Abominable Intelligence, while Hill said the Five Hundred Worlds would protect Lox and insisted that the ships had only Machine Spirits.
• Lox activated a weather control device that generated planet-spanning storms, breaking down and collecting toxic and radioactive substances from Mustafar’s atmosphere.
• Oxygen factories began adjusting the atmosphere, and rain filled low-lying areas with water as Lox designated a basin to become an ocean.
• Lox told Hill that Mustafar still needed magnetic generators at its poles to hold the improved atmosphere in place.

Guilliman assessed the growing threat to the Five Hundred Worlds as the Word Bearers and World Eaters gathered forces and the Ultramarines struggled to rebuild. He ordered gene-seed production and fleet repairs while preparing to defend Ultramar against the traitors.

• Guilliman dismissed inquiries about Mustafar and focused on reports of the Word Bearers and World Eaters entering the Five Hundred Worlds.
• Guilliman examined intelligence about enormous, unknown trident-shaped warships and worried that Mars might be involved in their construction.
• Marius Gage reported that recruit selection was underway on fifty planets and that gene-augmentation success exceeded ninety-five percent.
• Gage reported that only around thirty-six thousand gene-seed had been recovered from Calth, so Guilliman ordered Mechanicus biological specialists to assist with production and implantation.
• Gage said damaged warships would take three to six months to repair and the Macragge's Honour needed a month of maintenance, prompting Guilliman to gather the scattered fleets under unified command.
• Guilliman vowed to bury every invader in the Five Hundred Worlds and bring the traitors before the Emperor.

Lox presented designs for adamantium power armor and a stronger-force suit, then began producing the first adamantium armor at the vehicle factory on Mustafar. The printing had reached only the knees, but the Space Marines saw the prototype taking shape.

• Mustafar’s automated base, mining operations, and resource production expanded as the planet became habitable.
• Lox showed Hill, Nykona, and Wayland a lighter-looking Mk IV-based suit made from adamantium, explaining how matter reconstruction equipment could shape the metal.
• Lox described antimatter furnaces, adamantium-polymer muscles, improved protection and sensors, and a deflection field for the new armor.
• Lox revealed a four-meter strong-force suit with an anti-gravity engine and jet pack, designed to contend with ground vehicles and Titans.
• Lox led the Space Marines to the vehicle factory, where the Cogitator began printing adamantium armor; after about an hour, it had formed up to the knees.

Lox demanded a massive supply of adamantium to produce power armor and planned to re-equip the Ultramar Auxilia, prompting Guilliman to arrange a visit to Mustafar. Lox argued that automated mass production was necessary to arm mortal forces, even while acknowledging the risks of corruption.

• Lox ordered Hill to demand large quantities of adamantium from Guilliman for power armor production.
• Guilliman offered wrecked ships from the Battle of Calth as an initial source of adamantium, but Hill warned that Lox also wanted to re-equip the Ultramar Auxilia.
• Hill explained that Lox prioritized arming garrisons on important worlds because the mortal forces faced too much pressure.
• Guilliman agreed to visit Mustafar with Gage and Ultramar Auxilia commanders to inspect its capabilities.
• Lox told Mustafar's workers and technicians that automated mass production was essential, despite the risks of Warp corruption.

Lady Yottun insisted that Guilliman take his honor guard when he visited Mustafar, citing the danger revealed by his past battlefield injuries and the planet’s unexplained anomalies. Guilliman agreed, and Auguston began preparing the escort for their departure.

• Lady Yottun demanded that Guilliman bring Auguston and the Victory Warriors to Mustafar, refusing to be swayed by his arguments.
• Lady Yottun reminded Guilliman that he had been blasted into space during the war and warned him not to travel carelessly while his enemies sought to kill him.
• Lady Yottun raised the unexplained anomalies and planetwide thunderstorms on Mustafar, and Guilliman called Auguston into the room.
• Guilliman agreed to bring his honor guard, and Auguston began organizing the Victory Warriors for the visit.
• Lady Yottun teased Guilliman about his childhood after Auguston left to make the arrangements.

Guilliman visited Mustafar and saw how Lox had transformed the barren world into a thriving technological hub. Lox welcomed Guilliman and Lady Yuttan, then explained that he would not give them the most dangerous weapons in his database.

• Guilliman, Lady Yuttan, and the Victorious Army traveled from Macragge to Mustafar and saw fleets of mining ships at work in the asteroid belt.
• Guilliman recognized the mining ships’ potential and learned from Lox that he had left behind a key piece to help overcome the Five Hundred Worlds’ predicament.
• Guilliman’s ship entered Mustafar’s atmosphere and revealed a restored planet covered in power stations, cables, and technology centers.
• Lox greeted Guilliman and Lady Yuttan at the landing port, and Lady Yuttan introduced herself as Tarasha Yuttan.
• Lox led Guilliman’s party toward the base and said he would not hand over the most dangerous weapons in his database because they were too hazardous for the Imperium.

Lox explained that he would improve existing Imperial weapons and equipment rather than introduce technology the Imperium could not accept, especially AI. He demonstrated adamantium power armor to Guilliman, whose commander Auguston tested its extraordinary speed and resilience against heavy weapons.

• Lox told Guilliman he would upgrade practical Imperial equipment and acknowledged that the Imperium's fear of AI made introducing artificial intelligence dangerous.
• Lox retrieved adamantium power armor and strong-force tactical Dreadnought armor, and Guilliman summoned Auguston to test the new armor.
• Auguston donned the adamantium armor and learned to control its power, finding that it greatly increased his strength, speed, and precision.
• Auguston ran across the training ground and demonstrated his mobility as he adjusted to the armor.
• At Guilliman's direction, the Victorious Army fired bolters, plasma guns, and meltaguns at Auguston, but the armor withstood the attacks with only minor scuffs.

Guilliman tested Lox’s adamantium power armor, equipped his guard and mortal forces with improved armor, and received a unique suit of stronger Tactical Dreadnought Armor. He then asked Lox for help building warships to replace the fleet lost after Calth.

• Guilliman ordered tests of the adamantium power armor, and Lox used a sensor-covered automaton to measure its limits against Knight weapons and tank guns.
• Lady Euten asked Lox to prioritize adamantium armor for the Invictus Guard, and Lox presented Guilliman with a uniquely customized suit of Tactical Dreadnought Armor made from strong nuclear force material.
• Guilliman accepted the suit and asked that Mechanicus priests perform the rituals needed to see whether its basic intelligence system could develop a Machine Spirit.
• Lox showed Guilliman standard-pattern carapace armor for mortal troops, and Guilliman ordered upgrades for auxiliary forces on Macragge, Armatura, Konor, and other important worlds.
• Guilliman asked Lox whether he could build powerful warships to address the fleet losses suffered after the Battle of Calth.

Lox proposed turning an asteroid into a mobile battle planet to counter the Word Bearers and World Eaters, and Guilliman accepted the plan. Lox promised to complete the weapon within a month, and work began on Virgin Star.

• Lox explained that building major warships required time and shipyards, while mining ships could be mass-produced but were vulnerable.
• Guilliman reported that Lorgar and Angron were leading the Shadow Crusade with support from at least two Abyssal Fury-class vessels.
• Lox proposed binding an asteroid with gravity generators, equipping it with superweapons and engines, and using it to trap and destroy the enemy fleet.
• Guilliman agreed to lure the enemy into a suitable star system and use the battle planet for an ambush.
• Lox promised to turn an asteroid near Mustafar into a battle planet within one month and began intense production efforts.
• Factories produced gravity generators, and mining ships deployed them across Virgin Star as the Cogitator calculated that one million were needed.

Remembrancer Rowell McKane witnessed Amatla’s forces receive advanced armor, weapons, and vehicles as the planet prepared for war against the traitor Legions. Ultramarines also donned new auramite armor, and Rowell later recorded that they had become the Custodians of the Five Hundred Worlds when the Battle of Amatla began.

• Rowell McKane woke for reveille and wrote about rumors of the traitor Twelfth and Seventeenth Legions and the destruction of Calth.
• The captain ordered the 627th Company to collect new carapace armor, lasguns, volkite guns, and power packs.
• Rowell examined the advanced armor’s alloy, life-saving drugs, communications systems, helmet sensors, and servo-skull connection.
• The company received Chimera transports and saw Leman Russ tanks, Land Raiders, Basilisks, and Emperor’s Blade super-heavy tanks arrive.
• Ophio Cassandra welcomed Ultramarines bearing new auramite armor, and one-tenth of the Astartes on Amatla changed into it.
• When the Battle of Amatla erupted, Rowell wrote that the Astartes had become the Custodians of the Five Hundred Worlds.

Orfeo received the long-delayed report that Captain Lysimachus Sestus and his allies had destroyed the Word Bearers' Fussilade Abyss before it could attack Macragge, though all the loyalists involved had died. The news inspired Amarat's defenders to face the approaching enemy with renewed courage.

• Orfeo learned from an astropathic transmission that the missing Fist of Macragge had warned the Five Hundred Worlds about the Fussilade Abyss.
• A second message revealed that Captain Lysimachus Sestus had led a fleet to find the Word Bearers' ship, which carried psychic void mines and planned to attack Macragge.
• Orfeo announced that Sestus, nine battle-brothers, Skall, Bringal, the Fifteenth Legion warriors, Rear Admiral Kaminska, and their fleet had perished destroying the Fussilade Abyss.
• Orfeo recounted how Sestus and his allies boarded the enemy ship and sabotaged its plasma reactor, preventing its assault on Macragge.
• The report spread across Amarat, and Lowell wept as the citizens and soldiers took heart and vowed to defend the Five Hundred Worlds.

Ophio prepared Amatla’s people and defenses for an expected enemy assault while managing scarce Ultramarines forces and new weapons. When a psychic storm disabled astropathic communication, he confirmed that the enemy had arrived and ordered all forces into combat readiness.

• After Sestus encouraged them, Amatla’s people prepared to resist as supplies and reinforcements continued arriving despite the Warp storms.
• Ophio rejected Captain Bloom’s repeated request to lead a boarding assault, choosing to defend Amatla with its fortifications and ground-based weapons.
• Ophio reviewed Guilliman’s reinforcements and learned that Lox had converted mining vessels into small, dangerous disintegration-armed craft.
• Ophio ordered his adjutant to find pilots willing to operate the new vessels despite the risks.
• A psychic storm overwhelmed the astropaths and cut off outside communication, so Ophio ordered all forces to enter combat status.

The Word Bearers and World Eaters arrived at Amattra with overwhelming force, led by two Abyssal Fury-class warships, and battered the system’s defenses. After the Imperial fleet’s desperate charge failed to stop their advance, traitor Space Marines began landing on the planet.

• The rebel fleet emerged from the Warp at the edge of the Amattra System, led by the Three Sacred Litanies and the Blessed Lady.
• Amattra’s defense network opened fire, but the two Abyssal Fury-class warships endured the bombardment and destroyed the system’s star forts.
• The Imperial fleet charged the rebels, and its concentrated fire briefly overloaded the Blessed Lady’s void shields and struck its cathedral.
• Lorgar ordered his warriors to seize Amattra as an offering, while Erebus regarded Kor Phaeron’s empty seat with satisfaction.
• The rebel fleet broke through the defenses and entered low orbit, where shield domes rose over the planet.
• World Eaters and Word Bearers descended onto Amattra in Dreadclaw drop pods.

Lorgar led the Shadow Crusade toward its goal of cutting off the eastern Imperium, while Amatara’s defenders fought overwhelming Word Bearers and World Eaters forces. The defenders sent a pack of miniature assault craft against the enemy transports and warships, and the surviving pilots charged the Conqueror.

• Lorgar dismissed the Emperor as a false god and resolved to save Angron while advancing the Ruinstorm with further sacrifices.
• Amatara’s defenders faced an invasion force estimated at more than one hundred thousand, and Ophion ordered the Rim Watch Legion to prepare for the enemy Titans.
• The commander launched miniature assault craft to attack the descending pods and enemy transports.
• The craft evaded enemy fire and used disintegration beams to destroy transports and damage warships, killing many aboard before they could land.
• The surviving pilots rallied and charged the Conqueror, shouting, “For the Emperor! For Ultramar's Five Hundred Worlds!”

Lotara ordered the Conqueror’s crew to counter Ultramarine boarding craft and awakened the World Eaters’ Dreadnoughts. Locke discovered that his Legion had betrayed the Emperor, then protected his fellow warriors from an antimatter blast that crippled the ship and destroyed his own body.

• Lotara sent Devalus and the third-line troops to intercept the boarding craft, then ordered the Dreadnoughts awakened.
• The Techmarines roused Locke, a former War Hounds Legion master, and told him the Ultramarines were boarding the Conqueror.
• Locke learned that the World Eaters had joined the Warmaster’s rebellion and followed the Techmarines to a crashed craft.
• Locke found the craft empty of Ultramarines, with only dying mortal pilots inside, and shielded the World Eaters when one pilot triggered an antimatter blast.
• The blast crippled the Conqueror and destroyed Locke’s Dreadnought, leaving him alive with a broken heart as he watched the surviving World Eaters.

Angron prepared to lead the assault on Amattra after Lorgar redirected his rage toward vengeance. On the planet, Orpheo organized its defense and trusted Ultramar Auxilia Company 627 to hold the first enemy wave while reinforcements gathered.

• Angron dismissed the World Eaters fighting aboard the flagship and agreed to attack Amattra after Lorgar invoked his desire for vengeance.
• Orpheo learned that every wolf pack had been lost and that enemy forces had begun landing on Amattra.
• Orpheo ordered Ultramar Auxilia Company 627 to hold Position 267 while more enemies entered the encirclement.
• Company 627’s commander directed the soldiers’ fire and called in artillery support against the advancing World Eaters auxiliaries and Astartes.
• Twelve upgraded Basilisk artillery pieces struck the attackers, who continued charging through the bombardment.

The 627th Company used upgraded weapons and coordinated targeting to kill two World Eaters, though one auxiliary soldier lost an arm in the fighting. Chronicler Rowell McKen documented the victory from the frontline bunker, where the captain recognized his reckless determination as courage.

• A World Eaters veteran charged the trench but was incinerated by a veteran's charged melta gun before he could break into the position.
• A second World Eater attacked an auxiliary soldier and severed his arm, but the captain killed the attacker with his melta gun and shoulder cannon.
• Medics treated the wounded soldier, and the captain warned the company to stay alert and heed the servo-skull warnings.
• Rowell McKen recorded the 627th Company's feat and documented the battlefield from the bunker despite the captain's objections.
• The captain admired Rowell's foolish determination to witness the front line and saw it as the courage that drove Ultramar's people into battle.

The 627th Company of the Ultramar Auxilia held off repeated World Eaters assaults with upgraded weapons, surveillance, and coordinated firepower. When the World Eaters broke through another position and their numbers surged, Ophio judged the moment had come to act.

• The 627th Company repelled five World Eaters assaults, while avian servitors and coordinated volkite fire thwarted their attacks.
• The World Eaters brought a Sicaran forward, but the 627th Company’s concealed Stormlord and other weapons devastated the attackers following it.
• Ophio recognized that the World Eaters’ disorder and contempt for mortal troops had helped the Auxilia inflict heavy losses.
• The World Eaters shifted their attack to another position, where more than a thousand of them broke through and widened the breach.
• Ophio waited as the World Eaters’ numbers climbed past two thousand, then declared that the time had come.

Kharn and the World Eaters charged into the Ultramarines’ disciplined shield wall, expecting to crush their cousins but finding the formation nearly impossible to break. After an Ultramarine shield strike badly wounded Kharn, he realized the Ultramarines had lured them into a trap as their leader ordered a counterattack.

• The Regent of Amatara led the Victorious Guard to the front while the Ultramarines entered the battle against the World Eaters.
• Kharn led World Eaters through mortal auxilia defenses and dismissed the Amatarans’ resistance as futile.
• Kharn’s force charged the Ultramarines’ shield wall, but the formation held firm and inflicted heavy losses.
• An Ultramarine stopped Kharn’s attempt to bypass the wall and struck him with a shield, cracking his helmet and drawing blood.
• Kharn recognized that the Ultramarines had set a trap as their leader ordered them to advance and counterattack.