Vostroya lies out near the Halo Stars in the Segmentum Obscurus, a frigid, heavily industrialised world buried beneath endless manufactoria and towering hive-arcologies. Though it has never borne the formal designation of a Hive World, it functions as one in all but name, and it has kept close bonds with the Adeptus Mechanicus since the earliest days of the Age of Strife, its forges never falling silent.
The regiment's defining shame dates to the great betrayal that nearly destroyed the Imperium. When the call to arms came, Vostroya refused to release its regiments, choosing instead to keep its population toiling at the war-forges to feed the loyalist cause with materiel. In the bitter aftermath the guilt of that refusal calcified into sacred obligation. The Vostroyans swore that from that day forward the firstborn son of every family would be given up to the Emperor's armies, a living tithe of blood to answer the tithe of soldiers they had once denied.
Recruits are hardened amid the frozen, ash-choked ruins of the planet's dead districts before being shipped off-world once each generation, never to see Vostroya again. Unusually among the Astra Militarum, the Firstborn honour a duty to reinforce their scattered regiments, dispatching fresh sons across impossible distances so that no company withers away. They march in ornate crimson and gold trimmed with fur, bearing elaborately worked lasguns handed down through the generations, each an heirloom carrying the weight of the debt they can never fully repay.
Astra Militarum
Order of battle
The Vostroyan Firstborn field the units of the Astra Militarum — a detachment from the roster:
Kindred formations
Other Astra Militarum formations
Armageddon Steel LegionForged on a poisoned hive world locked in endless war against the greenskin, the Armageddon Steel Legion are the foremost mechanised infantry of the Astra Militarum. They ride to battle sealed within Chimera transports, their faces hidden behind rebreathers that filter their world's toxic air. Tempered by successive Ork invasions on their own soil, they are grim, methodical, and utterly unyielding.
Cadian Shock TroopsRaised on a fortress world that stood sentinel beside the Imperium's greatest warp storm, the Cadians were the finest line infantry the Astra Militarum ever produced. Bred from birth for war and drilled to machine-like precision, they became the standard by which all other regiments were measured. Their discipline under fire was legendary, and their sacrifice in the defence of their homeworld passed into grim Imperial legend.
Catachan Jungle FightersFrom a death world of predatory flora and monstrous fauna come the Catachans, the deadliest close-quarters and guerrilla fighters in the Astra Militarum. To reach adulthood on Catachan is itself a feat of survival, and those who muster into its regiments bring an animal instinct for ambush, sabotage, and the killing blade. They despise parade-ground discipline but excel where the fighting is dirtiest.
Death Korps of KriegThe Death Korps of Krieg are grim specialists in siege and attrition warfare, drawn from a blasted world that atoned for an ancient rebellion through centuries of self-imposed sacrifice. Masked, silent, and utterly fatalistic, they regard their own deaths as a debt owed to the Emperor. No regiment endures the horrors of trench warfare and grinding sieges with such uncomplaining resolve.
Elysian Drop TroopsThe Elysian Drop Troops descend from the heavens feet-first into the deadliest war zones the Imperium can devise. Light, fast, and lavishly trained in airborne assault, they drop by grav-chute and rappel from Valkyrie carriers to seize objectives far behind enemy lines. Once grounded, they melt into ambush and guerrilla warfare, trusting to mobility where they cannot trust to numbers.
Mordian Iron GuardFrom a tidally locked world of eternal night come the Mordian Iron Guard, perhaps the most rigidly disciplined line infantry in the entire Astra Militarum. Resplendent in immaculate parade dress even amid the carnage of battle, they stand shoulder to shoulder and pour disciplined volleys into the foe. Where lesser men break and flee, the Iron Guard hold their ground, unmoved by terror or slaughter.
Savlar Chem-DogsThe Savlar Chem-Dogs are penal regiments scraped from the poisoned mining moons of Savlar, where convicts toil and die amid toxic chemical deposits. Driven not by discipline but by greed and the promise of plunder, they are filthy, treacherous, and astonishingly effective in the very dirtiest fighting. The Imperium tolerates their crimes only because so few regiments kill with such vicious enthusiasm.
Tallarn Desert RaidersHailing from an irradiated desert world, the Tallarn Desert Raiders are the Astra Militarum's foremost practitioners of mobile and mechanised warfare. Masters of the hit-and-run strike, they wear down their foes with speed, patience, and relentless raiding rather than head-on assault. Their armoured columns strike from nowhere and are gone before the dust settles.
Valhallan Ice WarriorsBred in the frozen warrens of a shattered ice world, the Valhallan Ice Warriors are masters of attrition, siege, and the long war of endurance. They wed massed artillery to relentless infantry assault, spending lives without hesitation to grind an enemy down to nothing. Cold, stoic, and inured to every hardship, they have no equal when a campaign becomes a contest of sheer, unbreakable will.