Exorcists - Chapter Homeworld: Though the Exorcists spend extensive periods as fleet-based campaigners, the Exorcists' Chapter homeworld and permanent base of operations is the ancient Feral World known as Banish, which lies within the borders of the Narasima Straits, a quarantined sector of space on the Eastern Fringes of the Milky Way Galaxy in the Ultima Segmentum. The planet serves as the Chapter's primary training facility and armoury, with their fortress-monastery, the Basilica Malefex, housing their gene-seed stores, battle honours, and Apothecarion as well as vast archives of occult lore on the nature of Chaos and the daemonic.Banish also houses several secret Ordo Malleus research facilities under the Exorcists' protection.Boasting little in the way of natural assets or valuable infrastructure, Banish has proved an inconspicuous sanctum for a Chapter as insular as the Exorcists, being unlikely to draw unwanted attention from over-inquisitive allies. In addition, the primitive Human tribes of Banish have proven themselves a worthy recruitment pool for the Chapter's particular needs. These hardy nomads were descended from Imperial prospectors stranded on the planet in an earlier age, and centuries of isolation have made them a regressive but highly self-reliant people who have forgottenthe promise of advanced technology and galactic exploration.Beneath the steaming acid swamps of Banish lies the Exorcists' fortress-monastery, the Basilica Malefex. This mysterious and vast underground complex is unusual for being home to not only the strategic headquarters, Armoury and other facilities typical of most Space Marine homeworlds, but also the extensive precincts of the Radical Plutonian Inquisitors of the Ordo Malleus. It is here that Exorcists initiates are ushered into the gloomy depths of the Halls of Tempering. Full details of the arcane technologies housed in this place of daemonic possession are known only to the Ordo Malleus Radicals and senior figures in Chapter Command, and those Exorcists who emerge do so with no memory of the means by which the Inquisitors work.The remainder of the fortress-monastery houses all of the infrastructure required by any more orthodox Space Marine Chapter, along with a number of peculiarities. At the heart of the complex, a quadriform walkway called the "Cloister of Scars" links together the Chapter's training grounds, living quarters and command centres, while the huge atrium at the cloister's centre acts as a burial ground for the battle-slain, with dimly lit spaces reserved for private meditation. The outer walls of the Cloister are studded with many stone archways of varying size and grandeur. The larger of these lead off to the great institutions of the Chapter -- the Reclusiam, Apothecarion, Armoury and the Council Chamber where the Chapter Master and his company officers preside.The mightiest doorway of all leads to the Chapter Librarius. Behind thick blast doors sentried at all times, the Chief Librarian and his subordinates preserve detailed records of every Exorcists battle, paying special attention to any daemonic foes encountered and the methods used to defeat them. While all Space Marines seek to know their enemies and capitalise on their weaknesses, the Exorcists take this belief to the extreme, and their diligent accumulation of occult lore would be considered heretical by many Chapters.The Librarians understand the risks, however, and the dim vaults that harbour such tracts are wreathed in hexagrammatic wards and a perpetual haze of purifying incense. In truth, arcane subject matter forms a relatively small part of the Chapter's record-keeping; the Exorcists are a well-rounded fighting force equipped to engage all manner of enemies -- mortal, xenos and daemonic alike -- and through keen analysis of Chapter records they strive to be as prepared as possible for any threats they might face.