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Origins and the Horus Heresy legacy
The Chaos Space Marines were born from the wreck of the Emperor's grand design. In the twilight of the Great Crusade, the Warmaster Horus, most beloved of the primarchs, was seduced by the Ruinous Powers and turned nine of the twenty Space Marine Legions against the Master of Mankind. The war that followed consumed the galaxy. Brother butchered brother across a thousand worlds; the drop-site slaughter on Isstvan, the burning of Prospero, and the final apocalyptic siege of Terra itself are remembered with fresh hatred by warriors who witnessed them in the flesh.
When Horus fell dead before the Emperor and the traitor cause collapsed, the survivors fled inward, into the seething tempest of the Eye of Terror where the material universe and the immaterium bleed into one another. There, sheltered by daemon and storm, they were changed. The Eye is a place where time runs sideways and thought becomes substance, and within it the traitors endured for ten thousand years, nursing their wounds and their wrath.
The Long War
What the Imperium calls treachery, the Chaos Space Marines call the Long War: an unending campaign of vengeance against the father who, as they see it, betrayed them first. They believe the Emperor lied about the truth of the warp, that he cast his sons aside once their conquests were complete, and that only Chaos offered them the freedom and power they were owed.
For a hundred centuries their raids issued from the Eye of Terror in waves called Black Crusades, each hurled against the fortress worlds of the Cadian Gate. The greatest of these finally shattered that bulwark and tore the galaxy in two, splitting reality along a warp-rift of unimaginable scale. Through that wound the hosts of Chaos now pour without check, and the Long War, once a distant threat, has become an inferno raging across the stars.
The Dark Gods
Every Chaos Space Marine walks in the shadow of the four great powers of the warp. Khorne, the Blood God, rewards slaughter and martial fury. Nurgle, lord of decay, offers grim resilience and the terrible peace of despair. Tzeentch, the Changer of Ways, deals in sorcery, ambition and infinite scheming. Slaanesh, born of excess, promises sensation and perfection without limit.
Some warriors pledge themselves body and soul to a single deity and are remade in its image. Others, and Abaddon the Despoiler foremost among them, refuse to be the pawn of any one god, worshipping Chaos Undivided so that all four powers might smile upon their crusade. A rare few disdain the gods entirely, wielding the raw power of the warp as tool and weapon while owing allegiance to no master but themselves.
Organization: warbands and legions
There is no single Chaos army. The traitor forces are fractured into countless warbands, from lone renegades and freshly fallen Chapters to the ancient Traitor Legions that have hated the Imperium since before it was whole. A warband may number a handful of warriors or many thousands, bound by loyalty, terror or mutual ambition to a Chaos Lord, a Daemon Prince or a Dark Apostle.
The Traitor Legions each bear the scars of their fall differently. The Black Legion strives to unite all the fractured hosts beneath one banner. The Iron Warriors excel at siegecraft and the grinding mathematics of destruction. The Night Lords wage war through terror. The Alpha Legion works through infiltration and deceit. The Word Bearers spread the gospel of the Dark Gods with fire and scripture. What unites them all is hatred, and the endless corruption of the warp that gnaws at their souls.
Ways of war
Chaos Space Marines fight with the same weapons and disciplines that once made the Adeptus Astartes the terror of the galaxy: bolter, blade and lightning-fast assault. But ten thousand years in the Eye have twisted them. Their armour is fused with mutated flesh, adorned with skulls, spikes and blasphemous icons. Some are possessed by daemons, their bodies mere vessels for warp-entities that wear them like armour of meat. Others are so ancient and so hardened by exposure to Chaos that they have become living relics of a lost age. They favour brutal shock assaults, terror tactics and the summoning of daemonic allies to break an enemy's will before the killing begins.
Role in the 41st Millennium
With the galaxy sundered by the Great Rift, the Chaos Space Marines are ascendant as never before. No longer confined to raids from the Eye, their crusades range freely across a broken Imperium, striking undefended worlds and dragging whole systems into the dark. They are the vanguard of Chaos incarnate: immortal, implacable, and certain that this age of ruin is the beginning of their final victory. The Long War is far from over, but its fires now light the whole galaxy.
Order of battle
Units
HQ
Infantry CharacterChaos LordTyrant-kings of the Heretic Astartes, Chaos Lords are the mightiest champions of a warband, ruling through terror, cunning, and the hard-won favour of the Dark Gods.
Infantry CharacterDark ApostleFanatical priests of the Dark Gods, Dark Apostles preach damnation with such fervour that whole regiments turn traitor, their sermons ringing out above the din of battle.
InfantryMaster of PossessionThe Master of Possession is a specialist sorcerer-priest devoted to the darkest of arts: the summoning of daemons into the material realm and their binding into willing and unwilling flesh alike. Steeped in forbidden lore and warp-craft, he tears open the veil between worlds to call forth the denizens of the immaterium, marshalling possessed warriors and daemonic horrors to fight at his command. Where he walks, the boundary between reality and nightmare grows thin, and the battlefield becomes a doorway for the powers of Chaos.
Psyker CharacterSorcererWielders of forbidden warpcraft, Chaos Sorcerers bend the raw power of the Immaterium into ruinous spells, trading their souls for knowledge no mortal was meant to hold.
Infantry CharacterWarpsmithTwisted masters of the machine, Warpsmiths bind screaming daemons into engines of war and mend the war-plate of Chaos with crawling mechadendrites and unholy rites.
Troops
InfantryChaos CultistsThe fanatical mortal masses of Chaos, Cultists throng before the Heretic Astartes in expendable hordes, buying victory with their blood and their fervent, willing sacrifice.
InfantryChaos Space MarinesThe rank and file of the traitor hosts, Chaos Space Marine squads are the corrupted remnants of the Emperor's finest, superhuman killers hardened by ten thousand years of endless war. Clad in ancient power armour fused with mutated flesh and daubed in blasphemous icons, they advance behind a hail of bolter fire before falling upon the foe with chainsword and brutal ferocity. Bitter, tireless and utterly without mercy, they form the backbone of every warband and legion, the immortal foot soldiers of the Long War.
Elites
InfantryChaos TerminatorsEncased in hulking suits of Terminator armour, Chaos Terminators are among the most formidable warriors a Chaos host can deploy: nigh-unstoppable killers who teleport into the heart of the enemy and shrug off firepower that would obliterate lesser troops. Their ancient tactical plate, coveted and rare, is often twisted by the warp and adorned with daemonic sigils. Armed with combi-weapons, power fists and daemon-forged blades, they smash through defences and butcher all before them in a storm of point-blank slaughter.
InfantryChosenThe Chosen are the veterans and champions of a warband, warriors who have survived countless campaigns and proven their worth in blood. Better armed and more richly armoured than the common ranks, they serve as the trusted retinue of Chaos Lords and the tip of any assault. Bristling with an array of specialist weapons and trophies of past slaughters, the Chosen strike where the fighting is fiercest, elite killers whose experience and cruelty mark them above their brethren.
WalkerHelbruteA Helbrute is a towering engine of destruction, a Chaos Space Marine so grievously wounded he has been entombed within a war machine and driven to the brink of madness by his imprisonment. Neither fully alive nor allowed to die, the pilot rages within his metal sarcophagus, and when unleashed he vents ten thousand years of pain upon the foe. Bristling with heavy weapons and monstrous close-combat limbs, the Helbrute is a frenzied killer whose fury knows no restraint.
Daemonkin InfantryPossessedWarriors who have surrendered body and soul to daemonic tenants, the Possessed are ever-shifting horrors of claw, fang, and warp-fire that revel in slaughter.
Fast Attack
Jump InfantryRaptorsSadistic sky-hunters who fall upon their prey from above, Raptors are corrupted assault troops addicted to terror, their howling descents heralding butchery.
Jump InfantryWarp TalonsDaemonic predators that tear their way out of the Warp itself, Warp Talons materialise amid their prey in a blaze of unnatural fire, lightning claws flashing.
Heavy Support
Daemon EngineDefilerA towering, crab-like war-engine of six spined legs, the Defiler stalks the battlefield with a battle cannon and rending claws, a daemon's fury given monstrous shape.
Daemon EngineForgefiendA daemon caged in a centauroid engine of iron, the Forgefiend vomits red-hot phosphor shells from cannons grown into its body, a bound spirit venting its fury from afar.
InfantryHavocsHavocs are the heavy weapon specialists of the Chaos Space Marines, warriors who forgo the joy of close slaughter for the cold satisfaction of long-range annihilation. Bearing the heaviest man-portable armaments a warband can muster, they lay down withering barrages that shred infantry, cripple armour and rake the skies clear of aircraft. Positioned to command the battlefield, Havocs provide the murderous fire support behind which the rest of the host advances to butcher what remains.
Daemon EngineMaulerfiendA frenzied engine of claws and lashing tendrils, the Maulerfiend hurls itself at the enemy's strongest points, rending tanks and Dreadnoughts apart in its talons.
Daemonkin InfantryObliteratorsBloated fusions of flesh, daemon, and machine, Obliterators grow living weapons from their own bodies, spitting fire from ever-shifting armaments welded into their corrupted forms.
Heroes & legends
Characters
Abaddon the DespoilerThe DespoilerAbaddon the Despoiler is the greatest champion of Chaos in the galaxy, Warmaster of the traitor hosts and lord of the Black Legion. Once the foremost captain of Horus himself, he rose from the ruin of the Heresy to unite the fractured legions and lead the Long War against the Imperium. Wielding the daemon sword Drach'nyen and the lightning-wreathed Talon of Horus, he has launched crusade after crusade against Terra, and it was his hand that finally broke the Cadian Gate and split the galaxy in two.
Be'lakorThe Dark MasterBe'lakor was the first mortal ever raised to daemonhood by the united will of the Chaos Gods, granted a measure of each of their power. But his masters came to fear their creation, and cast him down into eternal, bitter servitude. Now he schemes without end, a being of near-limitless might forever denied the freedom and dominion he craves.
CypherThe Fallen AngelThe most enigmatic of all the Fallen Angels, Cypher is a shadow-wrapped gunslinger whose true name and purpose none can fathom. Bearing a sword he has never once drawn, he wanders the galaxy on a slow and secret pilgrimage toward Terra, though whether he means to damn the Emperor or beg His forgiveness, no one can say.
Fabius BileThe ClonelordFabius Bile is the galaxy's most infamous and brilliant flesh-shaper, a renegade Apothecary whose experiments upon the human and Astartes form have earned him universal loathing. Obsessed with perfecting mankind through unspeakable means, he creates monstrous new breeds of warrior, clones the dead and living alike, and sells his twisted craft to warbands across the stars. Ancient, amoral and utterly without conscience, he is a self-styled savior of the species whose methods are indistinguishable from atrocity.
Haarken WorldclaimerThe Herald of AbaddonHaarken Worldclaimer is the Herald of Abaddon the Despoiler, the dread messenger who announces the doom of worlds before the Black Legion descends upon them. Descending from the skies on screaming jump-jets at the head of the Raptors, he casts his great spear at a chosen target as a symbol that the planet has been claimed in the Warmaster's name. Where he appears, invasion follows, and his coming is a proclamation that a world's last hours have begun.
HonsouThe Half-BreedHonsou is an Iron Warriors Warsmith scorned as a half-breed for the taint in his gene-seed, a warlord who rose from that contempt to become one of the deadliest renegades of his Legion. Cruel, brilliant, and relentless, he built horrors from stolen flesh and waged a personal war of spite against the Ultramarine Uriel Ventris.
Huron BlackheartThe Tyrant of BadabOnce Lufgt Huron, Chapter Master of the loyal Astral Claws, he defied the Imperium and plunged the stars of the Maelstrom into the decade-long Badab War. Struck down and rebuilt into a cyborg after his defeat, he rose again as Huron Blackheart, master of the Red Corsairs and the greatest pirate-lord of the age.
Iskandar KhayonThe KingbreakerIskandar Khayon is one of the mightiest sorcerers of the Black Legion, a son of the Thousand Sons who became Abaddon the Despoiler's trusted lieutenant and a founder of his elite inner circle. Named the Kingbreaker for bringing even a Daemon Primarch to his knees, he now bides within an Imperial cell as one more piece in the Despoiler's grand design.
Vashtorr the ArkifaneThe ArkifaneVashtorr is a Greater Daemon born of mortal obsession with technology, a being of cold and meticulous malice who aspires to become the fifth great god of Chaos. To that end he forged the Arks of Omen and struck a pact with Abaddon, warring upon the Dark Angels to seize the scattered fragments of an ancient and terrible key.
Chapters, dynasties & kin
Subfactions
Alpha LegionThe Twentieth Legion are the great deceivers of the Long War, a serpentine brotherhood that fights not with open battle-lines but with lies, infiltration, and a thousand hidden hands. Where other Traitor Legions announce themselves in fire, the Alpha Legion unravels worlds from within, working through sedition, sabotage, and mortal proxies long before a single bolter is raised. Their warriors share a single defiant claim, that any one of them may be the primarch Alpharius, and so no enemy can ever be certain whom they truly face.
Black LegionThe Black Legion is the largest and most feared of all the Traitor Legions, forged from the ashes of Horus's own Sons of Horus after their primarch's death. Under the iron will of Abaddon the Despoiler, they cast aside their old colours and old shame, taking black armour to mark a new beginning. Where other legions cling to isolation and old grudges, the Black Legion draws in renegades of every stripe, uniting the fractured hosts of Chaos into a single crusading war-engine bent on the Imperium's utter destruction.
Crimson SlaughterThe Crimson Slaughter were once the Crimson Sabres, a rigidly disciplined Space Marine Chapter whose savagery on the world of Umidia drew the curse of Khorne upon them. Ever since, they have been haunted by the spectral voices of those they slew, a chorus of the murdered that no prayer can silence. Only in ceaseless bloodletting do the ghosts recede, and so the warband slaughters without end, dragging its damnation across the stars in a futile search for a moment's peace.
Iron WarriorsThe Iron Warriors are the master siege-breakers of Chaos, grim and pitiless engineers of destruction who reduce fortress worlds to rubble through overwhelming firepower and cold calculation. Once the Imperium's foremost specialists in siegecraft, they nursed a bitter resentment at being spent as siege-fodder while glory fell to others. That resentment curdled into treachery. Today they wage war as a science, favouring artillery, armour and attrition, and they take a grim satisfaction in proving that no wall, no matter how mighty, can stand against them forever.
Night LordsThe Night Lords are the terror-mongers of the Traitor Legions, waging psychological warfare with the same ruthlessness other legions bring to open battle. They strike from darkness in screaming lightning-marked craft, mutilating captives, broadcasting the screams of the dying, and leaving atrocities designed to shatter the courage of the living. To the Night Lords, fear is a weapon sharper than any blade, and a world paralysed by dread is a world already conquered. They fight not for the Dark Gods but for spite, survival and the sheer pleasure of the hunt.
Red CorsairsThe Red Corsairs are the largest renegade warband in the galaxy, a pirate empire that rules the warp-torn depths of the Maelstrom under the iron hand of Huron Blackheart. They are no ancient Traitor Legion but a wound torn open within living memory, born from the ruin of the Astral Claws Chapter after the fratricidal Badab War. Where insular Legions dwindle with the centuries, the Corsairs only grow, swelling their host with every raid, every renegade, and every captive broken and remade in Chaos.
The PurgeThe Purge are nihilist worshippers of Nurgle who cleave to only the darkest facet of the Plague God, despising life in all its forms and seeking not rebirth but annihilation. First appearing in the closing centuries of the 36th Millennium, they became convinced that the galaxy is beyond all saving and that purity can be found only in the sterile silence of death. Wielding poisons and engineered contagions, they wage genocidal war on human and xenos alike, praying for a plague that will scour every living thing from creation.
Word BearersThe Word Bearers are the zealots and prophets of Chaos, the first Legion to bend the knee to the Ruinous Powers and the architects of the entire Horus Heresy. Where other traitors war for vengeance or plunder, the Word Bearers war for faith, spreading the gospel of the Dark Gods across the galaxy with fire, scripture and sacrifice. Their Dark Apostles preach damnation to the masses and summon daemons to fight at their side, and they regard the destruction of the Emperor's atheist Imperium not merely as war but as a holy crusade of conversion.
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