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Orbiting at a distance of 1.32AU from its sun, Cadia is was the fourth planet of the [[Cadian System]]. It holds held a breathable atmosphere conducive to human life, with an average temperature of 20°C and surface gravity of 1.12G.{{Fn|1a}} The planet's surface plays played host to a variety of terrain types, from frozen tundras and wind-swept moorlands to axel-tree forests.{{Fn|2}}

Perhaps the most unusual and significant feature of Cadia are were the mysterious [[Pylon]]s, structures of [[Necrons|unknown origin]] that predate predated the planet's colonization by man. Five thousand, eight hundred and ten intact Pylons are were spread out across the surface of Cadia, with a further two thousand either buried or in various states of disrepair. No two are were identical in design, but each one rises rose to precisely half a kilometer in height and extends extended a quarter-kilometer into the ground. Each Pylon also features featured slim, winding tunnels machined into them, each one no wider than a man's head and exactly two hundred and fifty meters long.{{Fn|1b}}{{Fn|2}}

Efforts by the [[Adeptus Mechanicus]] to study the Pylons has had failed miserably, as their surfaces are were totally impenetrable to scanning by [[auspex]] and efforts to map the tunnels via [[Servitor]]s have had resulted in missing probes. However, it is widely believed that they are were the reason for the existence of the Cadian Gate in the first place.{{Fn|1b}} During the [[13th Black Crusade]], as the [[warp storm]] '''Baphomael''' expanded to engulf the edges of the Cadian System, the Pylons simultaneously began resonating with an almost imperceptible vibration, and microscopic fractures began appearing on their surface. It was discovered that they were resonating at an amplitude similar to that produced by a [[Gellar Field]] in their effort to fight back against the encroaching storm.{{Fn|1d}}

Access to the Pylons is was generally forbidden, with it being deemed a rare privilege to be granted permission to visit if one is were not of sufficient military rank.{{Fn|9c}}

During the final stages of the [[Thirteenth Black Crusade]], the [[Magos]] [[Belisarius Cawl]] worked with the [[Necron Lord]] [[Trazyn]] to fully activate the Pylons and push the Eye of Terror back. However, in the end, [[Abaddon]] collided the debris of the [[Blackstone Fortress]] ''Will of Eternity'' into Cadia's surface, destabilizing the Pylons as they were fully awakening. In a catastrophic chain reaction , the Pylons were destroyed, which caused Cadia to be dragged into the Warp.{{Fn|10}}

Cadia was resettled sometime in the early [[M32|32nd millennium]] as a direct result of the [[1st Black Crusade]].{{Fn|4a}} The early defenses of Cadia, however, proved to be woefully ill-prepared, its major cities indefensible as they were built in the traditional [[High Terra]] style of broad, ordered avenues. Following the [[2nd Black Crusade]] , changes were made to improve the planet's fortifications, rebuilding the cities into their [[Kasr|present form]].{{Fn|2}}

During the [[Thirteenth Black Crusade]], Cadia was subjected to the largest Chaos invasion since the [[Horus Heresy]]. An A surprise opening surprise attack by the [[Volscani Cataphracts]] wiped out the Cadian High Command, forcing [[Ursarkar E. Creed]] to become its sole Castellan.

After vicious fighting , only one fortress, Kasr Kraf, remained. However, the tide of the battle nearly turned thanks to the intervention of [[Eldar]] and [[Trazyn]], who sought to reactivate the Pylons on the world and turn back the Warp. In the final battle beneath the surface of Cadia, Abaddon was forced to retreat as the Pylons were activating, but redirected debris from the [[Blackstone Fortress]] ''Will of Eternity'' into the planet. Cadia was shatteredand, and as the Pylons faltered , the planet was swallowed into the Warp. Castellan [[Creed]] and his Cadian 8th stayed behind to cover the evacuation and their fate remains ambiguous.{{Fn|10}}

Although Cadia was ultimately reduced to a burning wasteland by Abaddon’s Abaddon's assault, the worlds in the wider [[Cadian System]] fought hard to destroy the spearhead the Despoiler had plunged into their midst. The Great Exodus of Cadia had seen swathes of the Imperial defence redeployed to the sister worlds.{{Fn|11}}

As one of the most strategically important planets in the Imperium, Cadia boasts boasted a large military presence. [[Battlefleet Cadia]] provides provided orbital protection for the planet and can could call upon the assistance of neighboring sector fleets such as [[Battlefleet Agripinaa]], [[Battlefleet Corona]] and [[Battlefleet Scarus]].{{Fn|1a}} The planet's surface is was dotted with numerous orbital defense batteries, its skies were patrolled by flights of [[Imperial Aircraft]], and any incoming civilian craft that fails failed to transmit the daily access codes are were liable to be shot down without question.{{Fn|2}}

As a Fortress World, Cadia's entire population belongs belonged to some branch of the Imperial military. Perhaps most famous of all are the [[Cadian Shock Troopers]], [[regiment]]s raised for service within the [[Imperial Guard]]. The Shock Troopers are considered some of the finest soldiers in the entire Imperium, even earning the respect of the legendary [[Adeptus Astartes]].{{Fn|5}} Cadians are well-known for their discipline, marksmanship and stoic sense of self-sacrifice, and are often emulated by other regiments.{{Fn|1c}}

The [[Planetary Defense Force]], known as the '''Cadian Interior Guard''', is was also counted among one of the best military organizations. This is because one out of every ten Cadians, regardless of their skills, is was assigned to the Interior Guard, resulting in some of the best soldiers spending their entire military career on Cadia.{{Fn|1b}}

Because of its closeness to the Eye of Terror, Cadia also maintains maintained the '''Internal Guard''' for defense against [[Chaos cult]] activities. A less well-known part of the Cadian military establishment, the Internal Guard consists consisted of [[Inquisitor]]s of the [[Ordo Malleus]] that have had been permanently seconded to the Cadian military, and make made frequent use of [[Sanctioned Psyker]]s.{{Fn|1c}}

Cadian society is was heavily militarized, with 71.75% of its total population under arms,{{Fn|1a}} and a birth rate equal to the recruitment rate.{{Fn|6a}} Cadian children are were taught how to strip, reassemble and shoot a [[lasgun]] before they are were taught how to read. Prior to puberty , they are were sent to survive on their own on the isolated islands of the '''Caducades Sea''' during the '''Month of Making''', and by age ten most can could perform infantry field drills and are were proficient in killing.{{Fn|2}} All Cadians must were to train in the defense forces, joining the Youth Armies (also known as the Whiteshields) to train alongside regular soldiers and fight mock battles with each other in the Cadian wilderness.{{Fn|6a}} Both men and women serve served within front line roles in both mixed and single sex regiments, with all female regiments tending to serve within the Interior Guard rather than off-world{{Fn|9b}}

Cadia is was under permanent martial law, leading to a number of differences when compared to other Imperial worlds.{{Fn|2}} The role of [[Planetary Governor]] is was a military one, known as the '''Governor Primus''', similarly serving as leader of the Cadian High Command. In times of emergency, when the Governor Primus is was incapacitated, a special military rank of [[Lord Castellan|Lord Castellan of Cadia]] exists existed that by common consent can could take over as commander-in-chief of the Cadian military.{{Fn|6b}} Also, there are were no [[Arbites]] on Cadia, with the role of policing the population falling upon the Cadian Interior Guard.{{Fn|2}}

This martial theme extends extended its way into every aspect of life on Cadia. Civilian clothing incorporates incorporated camouflage patterns, available in a variety of urban and wilderness colouring, while the dwellings of both rich and poor are were armoured against attack.{{Fn|2}} Cities on Cadia, known as '''Kasrs''' in the local dialect, are were fortresses in their own right. Each Kasr is was protected by rings of massive earthworks studded with gun emplacements and weapons batteries and separated by an inner moat. Passage over the moat is was controlled by hydraulic bascule bridges, each one guarded by a heavily armed barbican, and defended by the many armored fortifications and shatrovies overlooking it. Once inside, the streets of each Kasr are were laid out in elaborate geometric patterns, from the air resembling an intricate puzzle. Given the Cadians' mastery of urban warfare, this layout allows allowed them to hold each Kasr for months, even years, should the outer defenses fall.{{Fn|2}} Tens of thousands of different criminal gangs operate operated throughout the densely populated Kasrs, with ganger tattoos common amongst the troopers raised from these populations{{Fn|9a}}

Social class on Cadia is was dictated by military rank, which in turn leads lead to the upper echelons of command within the Cadian regiments to be highly classist - importance being placed on being from a military family or one's bloodlines as well as military competence{{Fn|9d}}{{Fn|9a}}

The ever-constant death toll from Chaos incursions, combined with the limited amount of land available, has had also lead to the implementation of the '''Law of Decipherability'''. Every graveyard on Cadia is was maintained by local priests who routinely check checked the tombstones of the honoured dead for legibility. When a section of the cemetery is was deemed illegible , those graves are exhumed and the bones are were added to a communal pit. Because their names are were no longer known, the need to honour their memory has had passed, and the space can could be reused.{{Fn|2}}

Cadia is was heavily industrialized with a large population of skilled workers dedicated to producing military equipment.{{Fn|5}} This allows allowed Cadia to outfit its Shock Troopers with only the best military equipment. Such is was the rate and scale of production on Cadia that it is was the largest exporter of arms and munitions in the region.{{Fn|4b}}{{Fn|6a}}