The successor Chapters of the Space Marines number in the hundreds, founded to fight for the survival of the Imperium. Across 13 short stories by 10 different authors, discover the history, customs and stories of 12 different successor Chapters, from famed warriors to unsung heroes.

Artificer General Sebastian Nemo has faced myriad dangers while serving his king and kingdom, but none so fascinating and sinister as the Convergence of Cyriss. In the wake of an unprovoked attack on the Cygnaran town of Calbeck, Nemo and his forces hasten to confront the strange clockwork soldiers and machinery led by a young warcaster prodigy named Aurora, Numen of Aerogenesis. Nemo soon learns of the Convergence’s plans to transform Caen and its people to suit their enigmatic goddess, who favors machines over the living.

AD 2565. Tranquility-4 near the frontier of the White Knight Empire. Guided by mysterious orders, the authorities at the Human Marine Corps base of Beta City thaw Lance Scipio. In 2441, an entire Marine company was executed with the exception of Captain Grimgerde and Sergeant Lance Scipio, the usual punishment for running in the face of the enemy. But these two were preserved...as if they would be required in the future.

An apocalyptic war looms, and few believe it is a war that can be won. As Terran colonies evacuate, the mighty Laconians stand alone against the merciless Median Empire. They will never surrender, and their new King, Agesilaus, has a scheme that could transform the fortunes of all Terrans. As leader of the most powerful of the Terran states, he plans the unthinkable. Inspired by the valor and adventures of the infamous Ten Thousand mercenaries, he launches a pre-emptive strike against the Empire.

After seven years of bitter war, the end has come at last for the conflict known infamously as the Horus Heresy. Terra now lies within the Warmaster’s sights, the Throneworld and the seat of his father’s rule. Horus’ desire is nothing less than the death of the Emperor of Mankind and the utter subjugation of the Imperium. He has become the ascendant vessel of Chaos and amassed a terrible army with which to enact his will and vengeance. But the way to the Throne will be hard as the primarch Rogal Dorn, the Praetorian and protector of Terra, marshals the defences.

Sikander Singh North has always had it easy - until he joined the crew of the Aquilan Commonwealth starship CSS Hector. As the ship's new gunnery officer and only Kashmiri, he must constantly prove himself better than his Aquilan crewmates, even if he has to use his fists. When the Hector is called to help with a planetary uprising, he'll have to earn his unit's respect, find who's arming the rebels, and deal with the headstrong daughter of the colonial ruler - all while dodging bullets.

After the mysterious discovery of an alien mech inside a comet, Darkstream Security has finally completed its own design. They assign Chief Gabriel Roach with the task of whittling down hundreds of bright young recruits to form a team of elite mech pilots, which he will command. Their mission: protect human colonies from the almighty Quatro. A single Quatro can take down an entire squad of traditional soldiers. But Roach is the perfect one for the job.

AD 2568. As Major Arun McEwan readies the newly formed Human Legion to retake his home planet of Tranquility, loyalties are wafer thin, and morale is low. Even his closest friends harbor poisonous secrets. And he needs everyone beside him, because the legion must strike boldly and win allies rapidly if it is to defeat the overwhelming numbers of an enemy led by Arun's old nemesis. What the legion discovers will scar Arun's heart and change the meaning of the word human forever.

Anderson Cross knows command is his destiny. But a seemingly victorious engagement turns deadly as his ship catapults through space into alien territory. As it escapes, an errant torpedo destroys a relic sacred to the aliens. A holy war starts with one lit match, then explodes. Now, Cross and his executive officer, Kate Flynn, face the might of an alien invasion bent on the destruction of all Earth’s children. Their solitary ship now bears the hatred of an entire species. Can they survive long enough to save humanity?

To protect his young family from merciless corporate tyranny, Samuel Hyst signs up for the hazardous life of a salvage marine, the foot soldiers of a militarized deep space operation. Hazard pay is high for a reason, and Samuel must endure grueling tours of duty in the abandoned scrapyard quadrants of a war-torn universe. Endless wars rage across every galaxy, leaving damaged starships, rusted factories, and broken planets in their wake, all ripe for plunder by the desperate and the daring.

2105, September: Intelligence Analyst Caine Riordan uncovers a conspiracy on Earth's Moon - a history-making clandestine project - and ends up involuntarily cryocelled for his troubles. Twelve years later, Riordan awakens to a changed world. Humanity has achieved faster-than-light travel and is pioneering nearby star systems. And now, Riordan is compelled to become an inadvertent agent of conspiracy himself. Riordan's mission: travel to a newly settled world and investigate whether a primitive local species was once sentient - enough so to have built a lost civilization.

A chance discovery on the jungle world of Hyperion leads Alliance scientists on a path to creating a permanent spacebridge to the distant Orion Nebula. In a matter of days, great fleets of military and civilian ships depart for the single greatest expedition since the colonization of Alpha Centauri. Into this great adventure travel two heroes of the war, retired Marines Spartan and Teresa Morato, and their son Jack.

Humanity, previously dependent on the K'Tai for its Redlazore, discovers vast resources of the most valuable mineral in the galaxy on Agate and is now free to expand across the stars: Redlazore is also the key component to faster-than-light travel. The planet Agate is, however, the human colony-world which lies perilously close to the K'Tai Imperium, and the K'Tai resolve to put the upstart humans back in their place. The K'Tai Imperium invades Agate. On the ground, in the midst of the whirlwind conflict is the Carter family.

A great darkness has befallen the galaxy, and the armies of Chaos are rampant. To survive, humanity must retaliate and take back what they have lost. By the will of the reborn primarch, Roboute Guilliman, is the Indomitus Crusade launched - a military undertaking that eclipses all others in known history. From the Throneworld of Terra does the Avenging Son hurl his fleets, their mission the very salvation of mankind.

Holy warbringer of the Legio Metalica, the Imperator Titan Casus Belli has routed armies and levelled cities over 10,000 years of service in the name of the Machine God. As war engulfs the Dark Imperium, this mechanical god of battle arrives to destroy the renegade armies and tech-priests of Nicomedua. At the head of a battlegroup of Titans, Imperial Knights and skitarii, Casus Belli must defeat tainted war engines, Traitor Legionnares and armies of cultists.