Watch Fortress Erioch - History: The empty, echoing halls of Watch Fortress Erioch hold many secrets even beyond the ultimate enigma of the Omega Vault at its core. It has been noted that the very fortress itself defies logical explanation.It is a millennia-old edifice situated in a place where no Forge Master or architect-savant of the Imperium could have travelled and where no materials for its construction could possibly exist. The explanation to this first mystery is deceptively simple, but reveals deeper layers of conspiracy lurking beneath the surface.Naval-minded Inquisition agents on their brief sojourns at Erioch have postulated that the star fortress must have been brought there in some great and secret undertaking in the past. They point to subtle points of architecture still visible beneath Terran centuries of accumulated restructuring that are reminiscent of a mighty Ramilies-class Starfort. Such an edifice could be moved through Warpspace they insist, meaning that if they are correct, Watch Fortress Erioch could -- potentially -- be moved again.The Imperium's scant supply of gigantic semi-mobile void stations like the Ramilies are vital to the Navis Imperialis as forward fleet bases. Each one is capable of shortening campaigns by solar decades through its deployment. That such a rare and precious commodity should have been risked in transport all the way to the distant Jericho Reach and then left essentially unused speaks volumes as to the perceived value of the location -- and of the overpowering reach of those who caused the fortress to be established there. Surely locked away within this ancient fortress can be found knowledge of the most heinous alien lifeforms Humanity has ever encountered.Watch Fortress Erioch is a vast void bastion that lies in the outer reaches of the Erioch System in the untamed void between the Canis and Acheros Salients of the Jericho Reach. It is situated in a stellar dead zone populated by only a handful of failing, ancient stars -- of which Erioch itself is one.A brutal mass of armoured basilica, domes, and spires, the watch fortress bristles with enough armament to rival a sizable battlegroup of Imperial warships, largely concealing the fact that underneath the Imperial ceramite and firepower, it is built on a ruined alien artefact that was old when Terra's star was first forming.Within it is a vast maze of echoing, dust-carpeted corridors that wander past silent chapels and armoured vaults sealed with adamantium doors. Beneath war-tattered banners of glories past, the battle-brothers of the Deathwatch in residence move between their cells, practice ranges, armouries and briefing theatres like spectres in a dead city, their numbers swallowed by the vast and labyrinthine nature of the fortress.Within the watch fortress, the Deathwatch gathers to rearm, train, and report. From within its confines, kill-teams are despatched on missions to every corner of the Jericho Reach, and sometimes beyond. The fortress contains vast command cathedrals where watch captains come to discuss strategy, developments within their assigned vigils, and consult with the Inquisitor of the Chamber and the Master of Vigilance.Alongside the towering Adeptus Astartes scurry the far more numerous servitors and hooded, mind-wiped Chapter serfs that keep the watch fortress alive and functioning. These lobotomised or oath-bonded servants crew the watch fortress' weaponry, and serve under the eyes of the Forge Master in the maintenance of its Machine Spirits, their pasts shorn from them by mental conditioning. They remember nothing of their history, and know no life beyond the fortress and the demands of their duty.The watch fortress could hold an entire Chapter of Adeptus Astartes with ease, but its records show that there are rarely more than a few score Deathwatch Space Marines garrisoning it at any time. Even during the grim events of the Council of the Ascension in 756.M41, no more than two hundred battle-brothers were gathered within the fortress.As a matter of course, most of the Deathwatch Space Marines within the Jericho Reach only spend brief periods in the watch fortress before leaving again to fulfil their missions or to garrison other watch stations within the Reach. Indeed, some never see the fortress during their service in the region.Instead, they spend their time on one bloody battlefield after another, or as the lone warden in watch stations far from their battle-brothers. The only exception are the guardians of the Chamber of Vigilance; a ten-strong squad of Deathwatch Keepers. Joining them is a position of great honour, and only battle-brothers who have performed a feat of exemplary courage and dedication during their Long Vigil are considered for service amongst these guardians.Aside from the Deathwatch and their servants -- including cloisters of Navigators and astropaths permanently sworn to their service -- Watch Fortress Erioch occasionally hosts members of the Inquisition and their attendant cadre of Throne Agents, Acolytes, and other minions.Most of these Inquisitors come to consult with the Chamber of Vigilance, to examine some xenos article recovered by the Deathwatch, or to make a request for aid in person. In the long millennia, many Inquisitors have passed through the watch fortress. Some stay for extended periods, others barely a few solar hours.Some leave artefacts within one of the fortress' vaults, sealed to all but them, or those to which they entrust the cipher, key or secret of its opening. Some vaults have remained sealed in this way for Terran millennia; the horrors or secrets within shut away even from the Deathwatch itself.Despite the power of the Inquisition and the ancient and honoured role of the Inquisitor of the Chamber within the fortress' hierarchy, the sole and final authority of the watch fortress, and thereby all the Deathwatch Marines in the Jericho Reach, is the Master of Vigilance, the position of watch commander held by the most senior watch captain in the Jericho Reach.Others that have thought to act otherwise, including certain members of the Inquisition, have paid for this mistake with their lives.