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Khangba Marwu, also known as The Vault, was a large underground Imperial prison complex on Terra intended to hold the worst criminal of the Imperium of Man. Its inmates were overseen by the Legio Custodes during the 31st Millennium. The prison was located in the Himalayan Mountains under the mountain peak of Rakaposhi, and had been contructed at least a thousand years before the Horus Heresy began by persons unknown. The prison was home to some of the worst criminals of the Imperium and had been used to imprison several of the tyrants defeated by the Emperor's forces during the Unification Wars. Some of these warlords, such as Uilleam the Red, the Prince of Albyon, the Ethnarch of the Caucasus Wastes and Narthan Dume, the Tyrant of the Pan-Pacific Empire, had cells designed for them by the Emperor Himself to ensure that they would never escape. Once the Horus Heresy began, a cell that was never occupied was also prepared for the traitorous Warmaster Horus. The prison also became a dumping ground for the Outcast Dead, those members of the Traitor Legions who had been stationed on Terra as part of the Crusader Host, an Astartes honour guard that had once served in the Imperial City on the outskirts of the Imperial Palace.
The prison's cells and walls were cut from the limestone of the mountain and layered with Adamantium plates, and cells used to house psykers had psi-resistant crystals built into the walls. There were multiple security systems in place to ensure that prisoners could not escape, including cell blocks that would drop into abyssal holes in the ground during an escape attempt and Combat Servitors armed with Autocannons and Assault Cannons.
During the Horus Heresy many of the Custodes that were normally stationed at The Vault were sent to reinforce Imperial units fighting the Traitor Legions or increase the Imperial Palace's security, leaving the prison undermanned, and this weakened security would eventually allow the members of the Outcast Dead to escape from The Vault.
Fuentes
Extraído y traducido de Wikihammer 40K UK.
The Outcast Dead, por Graham McNeill.