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At a glance
Cadia was the most important fortress world in the Imperium. It stood in the Cadian Gate, the only stable passage between the Eye of Terror and the rest of the galaxy, and for ten thousand years it was the shield that held back the Chaos Space Marines, daemons and renegades who lived within the Eye. Its people were born and raised for war, and the Cadian Shock Troops became the most respected regiments of the Astra Militarum. "Cadia stands" was not just a motto but a statement of fact that the whole Imperium relied on.
The planet itself was a harsh, wind-blasted world of moors, cold seas and fortress cities called Kasrs. Strange stone pylons rose across its surface, monuments older than humanity that the Imperium never fully understood. Only at the very end of Cadia's history did the truth emerge: those pylons were Necron constructs that held the Eye of Terror in check, and Cadia's survival had never depended solely on its soldiers.
In 999.M41, during the Thirteenth Black Crusade, Abaddon the Despoiler finally broke Cadia by ramming a Blackstone Fortress into it. The planet shattered. The Fall of Cadia opened the way for the Great Rift and became one of the most traumatic events in Imperial history. Cadia no longer stands, but its people do, and their regiments still march under the old banners.
Geography & environment
Cadia was a cold, grey-green world swept by constant winds. Its landscape was dominated by moorland, rugged hills, lakes and narrow seas, broken by the hard outlines of fortifications. Very little of the planet was left untouched by military engineering. Trench lines, bunker complexes, gun-pits and landing fields crossed the moors, and the planet was carefully divided into fortified zones designed to hold against any invader.
Its cities were the Kasrs, fortress-cities built to withstand siege. Each Kasr was ringed by thick walls, studded with defence lasers, artillery emplacements and void shield generators, and contained barracks, armouries and manufactoria. Kasr Holn was the capital and seat of the Lord Castellan. Other Kasrs such as Kasr Myrak, Kasr Partox, Kasr Kraf, Kasr Sonnen and Kasr Gallan were famous across the Imperium for the battles fought around them. Life inside a Kasr revolved around duty: everyone, including children, had a place in the defence plan.
The most mysterious features of Cadia were its pylons. Thousands of tall, slender monoliths of dark, unknown stone rose from the moors, some in remote wildernesses and some near the Kasrs. Imperial scholars knew only that they were incredibly ancient and that they seemed to somehow stabilise the region around the Eye of Terror. Many Cadians believed that the pylons were holy, and the Adeptus Mechanicus studied them for centuries without unlocking their secrets. When Archmagos Belisarius Cawl finally reawakened the network during the Thirteenth Black Crusade, he proved that they were part of a Necron engineering project designed to suppress the warp, and that Cadia's pylons were the reason the Eye had not expanded further.
Above Cadia, the night sky was dominated by the Eye of Terror itself, a vast, swirling purple and red wound in reality. Every Cadian grew up under its baleful light, and many came to believe that the Eye had left a mark on them; Cadians were famously born with violet eyes, a trait their people took as a sign of their sacred duty.
History
The world at the Gate
Cadia was settled during or shortly after the Great Crusade, and its strategic importance became clear after the Horus Heresy, when the defeated traitor Legions retreated into the Eye of Terror. The Imperium needed a bulwark to guard the only stable route out of the Eye, and Cadia became that bulwark. Fortifications were built across its surface, and its population was organised into a society entirely devoted to defence.
The Black Crusades
For the next ten thousand years, Cadia faced attack after attack from the Eye. Abaddon the Despoiler, heir to Horus Lupercal, launched a series of Black Crusades from the Eye, many of them aimed at or passing through the Cadian Gate. Some were small, almost probing raids; others were massive invasions that threatened entire sectors. The Imperium always held, and Cadia's victories became legend.
Countless smaller wars also broke against Cadia: renegade warbands, daemon incursions, Ork Waaaghs! and pirate fleets. The Cadian Shock Troops fought them all, and the reputation of Cadia grew. Its regiments were sent all over the galaxy, and its veterans formed the core of countless campaigns far from home.
Creed and the Thirteenth Black Crusade
At the end of the 41st millennium, Cadia was commanded by Lord Castellan Ursarkar Creed, a tactical genius found as an orphan in the ruins of Kasr Gallan and raised by the Cadian military. Creed and his bodyguard, Colour Sergeant Jarran Kell, became symbols of Cadia's defiance.
In 999.M41, Abaddon launched the Thirteenth Black Crusade, the largest he had ever led. Chaos fleets poured out of the Eye. Daemon worlds were unleashed. Traitor Astartes of the Black Legion and their allies made planetfall on Cadia. The fighting was colossal and desperate. The Cadians fought from every Kasr and every trench, supported by Space Marines, Sisters of Battle, Mechanicus legions and Titans. Saint Celestine appeared to fight beside them. Inquisitor Katarinya Greyfax and Belisarius Cawl worked to reactivate the pylons, and when they succeeded, the daemonic forces on the planet were banished in a terrible psychic shockwave.
Abaddon's response was simple and monstrous. He took one of the Blackstone Fortresses he had captured, the Will of Eternity, and drove it into Cadia's surface. The impact cracked the world apart. Creed refused to leave until the very end, and the survivors, led by Celestine, Cawl and Greyfax, evacuated as many people as they could. The planet's death throes were seen across the Cadian Gate, and its destruction helped set the stage for the opening of the Great Rift.
After the Fall
With Cadia destroyed, the Cadian Gate was broken and the forces of Chaos began to pour out of the Eye of Terror. The remaining Cadian regiments, scattered across the galaxy, became a people in exile. Many still fight, and many Imperial commanders say that as long as a single Cadian lives, Cadia stands. The slogan has become both a defiant boast and a mournful promise.
People & culture
Cadian society was organised entirely around war. Children learned to strip and reassemble a lasgun before they could read. They drilled from an early age, were taught military history and tactics, and were assigned to youth regiments known as Whiteshields. By adulthood, nearly every Cadian was a trained soldier. Those unable to serve in front-line regiments became support staff, militia or labourers in the armouries.
The Cadian ideal was the professional soldier: disciplined, skilled and loyal. Unlike regiments from feral worlds or hive worlds, Cadians were trained to fight as part of a coherent military system, with officers, specialists and support elements working together. Their tactics emphasised combined arms, careful use of cover and well-drilled firepower. Their elite troops, the Kasrkin, were among the best non-augmented soldiers in the Imperium.
Cadian culture was also marked by a quiet, stubborn pride. Cadians knew that the Imperium depended on them, and they rarely boasted. Their saying "Cadia stands" was used as a greeting, a farewell and a battle cry. Their slang was full of terms of military trade, and their religious life was dominated by worship of the Emperor as the Protector of mankind and the patron of soldiers.
The Cadian Gate
The Cadian Gate was the name given to the region of relatively stable space between the Eye of Terror and the rest of the Segmentum Obscurus. Elsewhere around the Eye, warp storms made navigation almost impossible, and any fleet that tried to leave the Eye by another route risked being scattered or destroyed. The Gate was the one place where large forces could reliably pass, which made it both the most important route for invaders and the most important place for the Imperium to defend.
Cadia was the key to the Gate, but it was not alone. Around it lay a constellation of fortified worlds, star forts and naval bases, including the worlds of Belis Corona, Agripinaa and Scelus. Imperial Navy battlefleets patrolled the region constantly. Chaos fleets that slipped past Cadia often found themselves trapped between these defences. During every Black Crusade, the goal of the attackers was to break the Gate and the goal of the defenders was to hold it at any cost.
The Gate was also a region of psychic danger. The proximity of the Eye made astropathic communication unreliable and daemonic incursions more common. Worlds near the Gate were watched closely by the Inquisition, and any sign of heresy was dealt with mercilessly. The people of the Gate learned to live with the knowledge that their worlds stood at the edge of hell.
Kasrs & landmarks
Kasr Holn
The capital of Cadia and seat of the Lord Castellan was a fortress-city of immense walls, deep bunkers and command centres. From Kasr Holn, Creed directed the defence of the entire Cadian Gate. It was here that he made his final stand as the planet broke apart.
Kasr Myrak and Kasr Partox
These Kasrs, like many others, were built around a core of manufactoria and barracks and surrounded by layered fortifications. During the Thirteenth Black Crusade, they were besieged by traitor forces, and their walls became the scene of brutal fighting as daemons and renegades sought a way in.
Kasr Gallan
Remembered as the ruined Kasr where the orphaned Ursarkar Creed was found, Kasr Gallan became a symbol of how Cadia turned tragedy into strength. Every Cadian child knew the story of the boy who rose from its rubble to become Lord Castellan.
The moors
The open moorlands between the Kasrs were not empty. They were cut through with trench systems, minefields and defensive lines that could be manned at short notice. Pylons rose from these moors, and Cadian soldiers often trained among them, never knowing that the monoliths were the true guardians of their world.
The Cadian diaspora
The Fall of Cadia did not end the Cadian people. Millions had already been serving off-world in regiments scattered across the Imperium, and the evacuation fleets carried many more away from the dying planet. These survivors became a people without a home, and their grief turned into a hard, cold determination. Cadian regiments in exile continued to recruit from among their own children, drilling them in the old ways and teaching them the history of their lost world.
Some Imperial commanders feared that the loss of Cadia would break the morale of its people. The opposite happened. Cadians became more stubborn, more disciplined and more determined to fight than ever. Their presence in the armies of the Indomitus Crusade and the defence of the Imperium Nihilus became a symbol of defiance. For them, the phrase "Cadia stands" now means that Cadia lives on in its soldiers, wherever they march, and that it will stand as long as a single Cadian carries a lasgun.
Defenders & war-machine
The defenders of Cadia were the Cadian Shock Troops, supported by armoured regiments of Leman Russ battle tanks and Baneblade super-heavies, artillery batteries, Sentinel walkers and Imperial Navy squadrons. The Kasrkin acted as shock troops and elite garrison troops in the Kasrs. Cadia's orbital defences included star forts, defence platforms and a powerful naval presence.
Space Marine Chapters regularly fought on Cadia and in the Cadian Gate, especially during Black Crusades. The Ultramarines, Space Wolves, Dark Angels and many others sent forces to the Gate over the millennia. The Adeptus Mechanicus maintained a presence to study and maintain the pylons, and the Inquisition watched Cadia closely for any sign of corruption.
Notable battles
- The early Black Crusades (M31-M41): repeated invasions from the Eye of Terror that broke against Cadia's defences.
- Countless uprisings and incursions: traitor cults, daemon outbreaks and renegade raids that tested every Kasr.
- The Thirteenth Black Crusade (999.M41): the final war for Cadia; see The Fall of Cadia.
- The Battle of Tyrok Fields: one of the great stands of the Thirteenth Black Crusade, where Creed's forces held against enormous odds.
Trivia
- "Cadia stands" became one of the most famous phrases in the Imperium, and it is still used by Cadian exiles today.
- The pylons of Cadia were never fully understood by the Imperium; only the reawakening during the Thirteenth Black Crusade revealed their Necron origin.
- Cadian regiments were so widely respected that they became the template for many Imperial Guard training manuals across the galaxy.
- Cadians were said to be born with violet eyes, which their people saw as a mark of their destiny to guard against the Eye of Terror.
- After the Fall, Cadian survivors were dispersed across many worlds, but their regiments retained their identities and traditions.
