The Siege of Vraks was a 17-year Imperial campaign to retake the armoury world of Vraks Prime, first from a rebel cardinal and then from the Chaos forces that flooded in behind him. It ended in an Imperial win that cost millions of lives and left the planet a ruin.
Prelude: how Vraks fell
Vraks Prime was a Departmento Munitorum armoury world, basically a planet-sized ammo dump. Trouble started when Cardinal Xaphan built a huge following there, preaching against heretics and doubters while quietly taking control. His sermons aimed at the downtrodden workers, which made him popular with the lower classes and worried the Ordo Hereticus.
The Ordo sent a lone Vindicare Assassin to kill him. The attempt failed, and once word spread that the Imperium had tried to murder their ‘saviour’, Vraks rose in open revolt. Xaphan’s Frateris Militia and labour-soldiers overran the local Arbites and Adepta Sororitas, tore down Administratum buildings in the central Citadel, and killed the Master-Prefect.
- 813.M41: the uprising begins
- Xaphan turns an armoury world into a fortress
- A failed assassination sparks full rebellion
The killing fields
The Imperium responded with a massive Krieg-led force, including 34 Krieg regiments, Titans of Legio Astorum, and support from Battlefleet Scarus. What followed was years of grinding trench warfare across no-man’s land, with Malcador tanks advancing into heavy fire and casualties climbing into the millions.
The Vraksian defenders had layered defences, minefields, and endless artillery. The Imperium’s early assaults made little headway, and the campaign settled into a bloody stalemate that dragged on far longer than anyone expected.
Chaos unleashed
As the siege wore on, Xaphan’s rebellion curdled into outright Chaos worship. The Cardinal and his inner circle turned to the Ruinous Powers, and warbands, daemons, and Traitor Legions answered the call. The defenders were no longer just rebels; they were heretics backed by the warp.
This shift changed the war. The Imperium now faced Berserkers, plague marines, and daemonic incursions, and the Ordo Malleus and Grey Knights were drawn in. The conflict stopped being a policing action and became a full Chaos war.
- Xaphan’s forces fall to Chaos
- Daemons and Traitor Legions join the defence
- Grey Knights and Ordo Malleus enter the fight
Angels of death and the final assault
Space Marines arrived to break the deadlock, including five companies of Dark Angels plus Angels of Absolution, Red Hunters, and Red Scorpions. Supreme Grand Master Azrael and Brother-Captain Arvann Stern are among the named commanders. Their intervention pushed the Imperium toward the Citadel.
The final assault was brutal. The Imperium eventually took the planet, but the victory was pyrrhic. The Collegia Titanica claimed 14 Titans of Legio Vulcanum destroyed, while other sources say at least 9 Imperial Titans were lost. The defenders were killed or scattered.
Aftermath and cost
The Imperium held Vraks Prime, but at a staggering price. Around 14 million Guardsmen died, along with hundreds of Space Marines, at least four Inquisitors, and multiple Titans. The world was left devastated and the campaign became a byword for attritional folly.
The siege lasted from 813 to 830.M41, 17 years of grinding war. It’s remembered as one of the Imperium’s most costly victories, a win that felt more like a wound.
| Faction | Key commanders | Notable forces |
|---|---|---|
| Imperium | Lord Commander Zuehlke, Marshal Amim Kargori, Lord Inquisitor Hector Rex, Azrael | Krieg regiments, Legio Astorum, Dark Angels, Grey Knights |
| Chaos | Cardinal Xaphan, Deacon Mamon, Arkos the Faithless, Zhufor the Impaler | Disciples of Xaphan, Traitor Guard, daemons, Legio Vulcanum |
Key facts
- Fought from 813 to 830.M41 on Vraks Prime, an armoury world
- Began as a rebellion led by Cardinal Xaphan
- Turned into a Chaos war after Xaphan fell to the Ruinous Powers
- Imperial victory, but pyrrhic, with around 14 million Guardsmen dead
- Notable Imperial commanders included Lord Commander Zuehlke and Azrael
- Chaos leaders included Xaphan, Zhufor the Impaler, and Arkos the Faithless
FAQ
How long did the Siege of Vraks last?
It ran from 813 to 830.M41, so about 17 years. The fighting went through phases, from trench stalemate to full Chaos incursion.
Who won the Siege of Vraks?
The Imperium won, but it was a pyrrhic victory. They retook the planet after losing around 14 million Guardsmen and taking massive material losses.
Why did the Siege of Vraks happen?
Cardinal Xaphan built a popular following on the armoury world of Vraks Prime and rebelled after a failed Imperial assassination attempt. The rebellion later fell to Chaos, turning it into a major war.