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Origins on Prospero and the Rubric
The Thousand Sons were, in the golden dawn of the Great Crusade, a Legion apart. Reunited with their gene-father Magnus the Red upon the world of Prospero, they built at the city of Tizca a beacon of enlightenment, its silver pyramids housing archives, laboratories and cults devoted to the mastery of the mind. Where other Legions prized martial glory, the Thousand Sons prized knowledge, and above all the study of the warp and the psychic potential blooming within their own ranks.
But theirs was a poisoned inheritance. A creeping affliction known as the flesh-change had long stalked the Legion, twisting warriors into gibbering, mutated horrors as their psychic gifts spiralled beyond control. It was Magnus who seemed to master it, and Magnus whose pride would doom them. When the primarch used sorcery to hurl a warning of Horus's treachery across the galaxy, he shattered a great arcane work upon distant Terra and confirmed, in the eyes of the Emperor, every fear about his most gifted son. The retribution sent against Prospero burned the city of learning to glass.
In the aftermath, as the flesh-change returned to ravage the survivors with renewed hunger, the Chief Librarian Ahzek Ahriman worked a great ritual he named the Rubric. He meant to still the mutation and save his brothers. Instead the spell consumed them. The strongest sorcerers were spared and even strengthened, but the many thousands who lacked such power were reduced to nothing but animate dust bound within their armour, mindless save for the commands of their masters. So were born the Rubricae, and so was the Legion hollowed out from within.
Tzeentch and the pursuit of sorcery
The Thousand Sons belong, body and soul, to Tzeentch, the Changer of the Ways, the Great Conspirator whose domain is fate, ambition, mutation and magic. Of all the servants of the Ruinous Powers, they are the most steeped in true sorcery, wielding the raw stuff of the immaterium with a precision and scholarship that no rival can match.
Their devotion is not the mindless zeal of fanatics but the hunger of scholars who have glimpsed that knowledge is power made manifest. Every secret uncovered, every spell mastered, every scheme brought to fruition is an offering to their patron, for Tzeentch delights in intricate plans and the endless turning of destiny's wheel. The Legion's sorcerers believe that with sufficient understanding they might yet reverse the Rubric, ascend to daemonhood, or reshape reality itself. That such ambitions almost always end in ruin and bitter irony is the great joke of their god, one they seem doomed forever to repeat.
Organization: the Cults
Where they endure as an ordered Legion, the Thousand Sons are divided into sorcerous fellowships, each devoted to a particular discipline of the arcane. These Cults reflect the many faces of Tzeentch and the varied paths by which his servants seek power.
The Cult of Prophecy peers through the veil of time, its members divining futures and threading the Legion's schemes through the tangle of fate. The Cult of Magic pursues raw destructive power, its adepts the deadliest battle-sorcerers of all. The Cult of Time bends duration itself, hastening allies and freezing foes mid-motion. Other fellowships pursue transmutation, the summoning of daemons, or the mastery of the mind. A sorcerer-lord commands each host, attended by his silent Rubricae and by the beast-warriors and daemon-things bound to his service.
Ways of war: psychic annihilation
The Thousand Sons wage war unlike any other force in the galaxy. Their armies are engines of psychic devastation, wielding the warp as both scalpel and sledgehammer. Sorcerers hurl bolts of coruscating flame, unravel the minds of the enemy, twist flesh into ruin, and tear open rifts through which howling daemons of Tzeentch spill onto the battlefield.
At the heart of their hosts march the Rubricae, tireless automatons who feel no fear and know no pain, advancing with mechanical relentlessness while their masters weave lethal enchantments overhead. Around them caper mutated Tzaangors and monstrous warp-beasts, and above the fray drift the Legion's arcane war-constructs. Yet for all their eldritch might, the Thousand Sons rarely fight with brute impatience. Every campaign is a calculated move within a longer design, and they will spend decades manoeuvring for a single stroke, striking only when the threads of fate have been drawn tight.
Role in the 41st Millennium
Cast into the Planet of the Sorcerers within the Eye of Terror, the Thousand Sons brooded for ten thousand years, and in the age of the Great Rift they have emerged with renewed and terrible purpose. Magnus the Red, ascended to daemonhood, has returned in the flesh, and under his guidance the Legion pursues schemes of galactic scale: raids upon Imperial archives, assaults on worlds of psychic significance, and the patient gathering of forbidden lore.
They are the enemy that strikes not merely at the body of the Imperium but at its mind and its future. To face the Thousand Sons is to war against foes who may already know how the battle ends, who wield weapons no bolter can answer, and who measure victory not in territory but in secrets prised from a jealous universe. In the sundered galaxy of the 41st Millennium, the sorcerers of Prospero pursue their long revenge, certain that knowledge, in the end, will grant them everything.
Order of battle
Units
HQ
CavalryAhriman on Disc of TzeentchAstride a Disc of Tzeentch, Ahzek Ahriman rides to war as the greatest sorcerer the Thousand Sons have ever produced. The disc bears the Arch-Sorcerer swiftly across the battlefield, from which vantage he reshapes the fates of whole armies and unleashes devastating storms of change-fire.
Infantry CharacterExalted SorcererAn Exalted Sorcerer is among the most powerful of the Thousand Sons' battle-mages, a master of the arcane who has risen high in the favour of Tzeentch. Commanding cohorts of Rubricae and lesser sorcerers, he wields devastating psychic power alongside centuries of accumulated cunning. Often borne aloft upon a Disc of Tzeentch, he strikes with spell and blade from unexpected quarters, a lord of the Legion whose ambition burns as fiercely as the warp-fire he commands.
Infantry CharacterInfernal MasterAn Infernal Master is a sorcerer-lord of the Thousand Sons versed in the darkest and most malign disciplines of the arcane, a specialist in curses, hexes and the sapping of an enemy's will. Where other sorcerers hurl fire, the Infernal Master works subtler ruin, unravelling minds, weakening resolve and binding daemons to lethal purpose. A figure of cold, calculating menace, he turns the psychic battlefield itself into a weapon, dooming his foes before a single shot is fired.
InfantryMagisterThe Magisters are the mortal champions of the Thousand Sons' hidden cults, human sorcerer-lords raised up to command the Legion's beastmen and cultist covens. Granted a measure of stolen power by Tzeentch, they marshal the Changer's earthly faithful in the sorcerers' absence.
CavalryTzaangor ShamanThe Tzaangor Shamans are the most exalted of the beastmen, prophets and psykers who ride to war on Discs of Tzeentch. They preach the will of the Changer to their fellows and treat with the Legion's sorcerers, though their loyalty belongs first and always to their god.
Troops
InfantryRubric MarinesThe Rubric Marines are the tragic core of the Thousand Sons, the animate dust of warriors consumed by the great spell that gives them their name. Sealed within ancient power armour by the Rubric of Ahriman, they are hollow now, their souls burned away, their bodies reduced to enchanted ash that moves only at a sorcerer's command. Tireless, fearless and utterly relentless, they advance in silent ranks, loosing warp-touched bolt fire, mindless automatons who were once the Emperor's finest and are now the dust of the damned.
InfantryTzaangorsTzaangors are the beast-warriors of the Thousand Sons, mutated creatures raised up by the changing power of Tzeentch into cunning and savage foot soldiers. Part man, part avian horror, they combine feral ferocity with a disquieting arcane intelligence, and the most gifted among them wield rudimentary sorceries of their own. Swarming forward in raucous, blade-wielding hordes, they serve as the expendable shock troops of the Legion, a chaotic and bloodthirsty counterpoint to the silent ranks of the Rubricae.
Fast Attack
BeastChaos SpawnChaos Spawn are the ruined ends of ambition, warriors and thralls of the Thousand Sons so overwhelmed by the changing power of Tzeentch that all form and reason have dissolved from them. Reduced to shambling masses of teeth, tentacles and writhing flesh, they retain nothing of their former selves save a mindless hunger to destroy. Among a Legion obsessed with mastering the warp, they are grim reminders of its price, unleashed upon the battlefield as expendable, unpredictable horrors.
CavalryTzaangor EnlightenedThe Tzaangor Enlightened are the seers of their mutant kind, borne to war upon Discs of Tzeentch. Gifted with glimpses of the flowing future, they strike with divining spears at the precise instant that will do the most harm, slaying foes who have not yet grasped their danger.
CavalryTzaangor SkyfiresThe Tzaangor Skyfires are disc-mounted hunters who wield the fatecaster greatbow, loosing ensorcelled arrows guided by glimpses of things to come. Reading the paths of the future, they pluck aircraft from the sky and slay distant targets with impossible, prophesied precision.
Heroes & legends
Characters
Ahzek AhrimanThe ExileAhzek Ahriman is the greatest sorcerer of the Thousand Sons after Magnus himself, and the most tragic and reviled figure of his Legion. Once its Chief Librarian, he worked the great spell called the Rubric in a desperate bid to save his brothers from mutation, only to reduce the many thousands of them to soulless dust. Cast out in disgrace and haunted by his failure, Ahriman has wandered the galaxy for ten thousand years, forever seeking the arcane knowledge that might undo the catastrophe his own hand unleashed.
AmonFirst of the CorvidaeAmon was Captain of the Ninth Fellowship and equerry to Magnus the Red, the primarch's tutor and trusted confidant and the first master of the precognitive cult that would become the Corvidae. He survived the fall of Prospero and the Heresy only to be undone at last by Ahzek Ahriman, the very pupil of his lord he had sworn to guard.
Magnus the RedThe Crimson KingMagnus the Red is the daemon primarch of the Thousand Sons, a towering figure of crimson flesh and boundless psychic might, and one of the mightiest sorcerers the galaxy has ever known. Gene-son of the Emperor, he built upon Prospero a civilisation of learning before his pride and his forbidden studies brought ruin upon his Legion. In his desperation he bound himself to Tzeentch and was ultimately raised to daemonhood. Now returned in the flesh, he wages a war of vengeance and revelation against the Imperium that cast him and his sons into damnation.
MenkauraThe OracleMenkaura is a venerable battle-seer of the Corvidae, gifted and cursed with visions of what is to come. A prophet who cast his lot with Ahzek Ahriman, he endured mortal wounds and long centuries to become an oracle bound to the Arch-Sorcerer, dwelling within a hollow moon of black crystal at the edge of the Great Ocean.
Chapters, dynasties & kin
Subfactions
Cult of MagicThe Cult of Magic is the fellowship of raw arcane power, home to the most destructive battle-sorcerers the Thousand Sons can field. Where other Cults pursue subtlety and schemes, its adepts pursue the direct and overwhelming application of the warp, channelling storms of eldritch fire and bolts of unmaking that reduce armour, flesh and fortification alike to drifting ash. They are the burning heart of the Legion's armies, and where they walk the very air ignites with unleashed sorcery.
Cult of MutationThe Cult of Mutation is the fellowship devoted to the transformation of flesh, wielding the raw changing power of Tzeentch to reshape body and being at a whim. Its adepts twist the enemy into ruined horrors mid-battle, warp their own thralls into monstrous shapes, and study the flesh-change that once nearly destroyed the Legion, seeking to command the very curse that haunts them. Theirs is the most visceral and unsettling of the sorcerous disciplines, a mastery of transmutation that renders no form fixed and no body safe.
Cult of ProphecyThe Cult of Prophecy is the fellowship of seers and fate-readers, the eyes through which the Thousand Sons perceive the tangled futures of the galaxy. Its adepts divine the paths of destiny, unravelling omens and threading the Legion's centuries-long schemes through the chaos of what may come. In war they turn foresight to lethal advantage, anticipating every enemy stroke, and in the councils of their sorcerer-lords their visions shape campaigns waged across generations toward ends only they can see.
Cult of TimeThe Cult of Time is the fellowship of the Thousand Sons devoted to the manipulation of duration itself, the most disorienting and feared of the Legion's sorcerous disciplines. Its adepts perceive the flow of moments as a malleable current, hastening their allies to blinding speed, freezing enemies in the amber of a stolen instant, and glimpsing the many futures that branch from every action. To war against the Cult of Time is to fight an enemy that seems always to have moved first, striking before the blow is even conceived and vanishing before retribution can fall.
The Prodigal SonsThe Prodigal Sons are the warband of Ahzek Ahriman, a cabal of exiled sorcerers who followed him from the Planet of the Sorcerers in pursuit of forbidden knowledge. Cast out for the catastrophe of the Rubric, they wander the galaxy seeking the power to undo what he wrought.
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