Fortress of the Just

On Scintilla, the Adeptus Arbites is based at the Fortress of the Just, a massive rockcrete slab that sits in the relentless desert a short flight away from Hive Tarsus. It is here that Lord Marshall Goreman’s headquarters can be found, along with the training facilities for the arbitrator cadets sent to the Calixis Sector, and the Sector Judicial archive. The Divisio Immoralis is based in a cramped set of offices in the Archive, while Scintilla’s large pool of enforcers trains regularly in the bullet-scarred mock town just outside the fortress. 
The Precinct Fortress on Scintilla is spoken of as a
traditional command, a place that refuses to slip
into abstractionism. This is a positive reputation
in an organization that values tight regimentation and
scrupulous adherence to procedure, and it is accurate.
The Fortress of the Just (as it is known amongst some
locals) has the usual balance between the judicial and
paramilitary, and contains some of the most extensively
experienced militant Arbitrators.
The weight of duty shows in the recruitment numbers,
with Arbitrators and Chasteners finding no end of suspects
and heresies to investigate, but also in the culture of the
organization. Calixian Arbites take great pleasure in the
blunt and brutal aspects of law enforcement, favoring
quick and simple action and disdaining protracted research,
conflicting interpretation, and unrelated scholarship
when possible. While any loyal Imperial citizen in the
sector would hold this attitude up as righteous, heretics
and scum consider the Calixian Precincts a refuge for
thugs and simpletons, whose enforcement of the law is
too unrestrained, lacking the proper intellectual rigor
and legal knowledge necessary to keep their actions
within the bounds of Imperial law. However, the Fortress
of the Just contains massive libraries in which an army of
Adeptus Arbites adepts collate and collect judgments and
information from every planet in the Calixis Sector, and
if any Arbitrator’s justice is found lacking the appropriate
legal precedent (or political clout), he may well find
himself the target of an internal investigation.
==Within the Fortress==
Scintilla’s most iconic symbol of impregnable Imperial law
is familiar across the sector, though few civilians have ever set
eyes on it: the Fortress of the Just, the gigantic, sheer-sided
black obelisk standing tall from the desert hardpan near Hive
Tarsus. The work of decades to build, the Fortress holds a small
city packed inside its thick walls. In the highest level, beneath
the broad cap of landing pads and the thickets of auspex and
uplink towers, Lord Marshal Goreman has his command center. Thinking best on his feet, he spends his day prowling through
a chain of austere office chambers where his thousands-strong
staff analyze data and synthesize briefings out of the endless
stream of reports and alerts from across the sector. At one end
of this command complex is a tiny, private Astropath’s eyrie,
and there is no end of rumors about its use. Some claim that
Goreman put a power-maul beneath Senior Astropath Xiao’s chin and
extorted the use of a seer out of him, others that the tower is
a penance posting for Astropaths guilty of crimes against their
own Adeptus charter, others still that the eyrie has been empty
for years, that no Astropath can be found whose mind can
manage the horrifying accounts constantly transmitted to it.
On the levels below are the carefully guarded data-loom
chambers of the Detective headquarters and the great libraries
of legal texts shipped from Terra, including the sealed shut,
ash-filled rooms where the most precious tomes are kept by
a horde of servitors and servo-scrubbers. Below this are the
massive vaulted chambers originally built for the Judges to
conduct legal ceremonies and hold the most important trials,
but these rooms are now mostly dark and quiet, full of stale
air. The judicial cohort at the Fortress is often in the field, and
most Judges prefers to use summary measures at the scene
rather than drag offenders to the Fortress for elaborate set-piece
trials. These rooms are most often reserved for politically
sensitive cases, or those that could set sector-wide precedent.
Below these are the packed and noisy barrack levels. The
Fortress is designed not only as a self-contained bastion but
as a hub for Arbites operations for light-years around, and the
Arbites it holds number enough to turn the tide in an uprising
or to fight a sizeable engagement on their own. These levels
also hold armories, chapels, evidence vaults, and medicae with
capacity more then enough to serve the Fortress’ entire garrison. The Fortress could easily hold and support half again its current
number of occupants if it had to. The lower levels are the
technical levels, the forges, machine-shrines, and hangars for the
Fortress’ vehicle fleet, and Verispex laboratories of breathtaking
complexity and specialization. In the lowest levels, extending
into the rock beneath the Fortress, are the giant generatoria
crypts and life support machinery that keep the Fortress running. The Fortress’ void shield projectors have not been used in living
memory, but they are maintained in impeccable order by a cabal
of Fluxmechanic Magi covenanted from the Lathes.