This archive tracks four layers. A record present in 1 of them (M41) is silent in the rest, and says so.
The Horus HeresyM30–M31
[RECORD LOST]
No record for this location in The Horus Heresy.
Age of the ImperiumM32–M40
[RECORD LOST]
No record for this location in Age of the Imperium.
The 41st Millenniumpre-Rift
imperium
Cardinal World of the Imperium
A Cardinal World whose walled capital, Rex Primaris, was surrounded by the cultists of Kayloss the Detractor. When they breached the walls, the Legio Magna Warlord Titan Tyrannus Maximus held the gap for seventeen hours until the Marines Errant arrived to turn the battle. Named in Crusade for Armageddon as part of that Titan's past.
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
Position
Map frame: 884, 732.7 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 449 units ≈ 47.8k light years, south-east of the galactic core.
Height above the disk plane: -10.5 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Orthoda Rex System
Books set here
1 title in the reading tracker touches this record. Titles link out to the tracker.
Every fact in this record, and where it came from. Editorial derivations say so.
identityhigh
wh40k.lexicanum.com/wiki/Orthoda_Rex (read directly in a browser on 2026-10-02): 'Orthoda Rex is a Cardinal World of the Imperium', the uprising of Kayloss the Detractor, the capital Rex Primaris and the Warlord Titan Tyrannus Maximus holding the breach for seventeen hours until the Marines Errant arrived, sole source Crusade For Armageddon (Novel), Chapter 5. NAME-COLLISION CHECK: no index record uses the name.
segmentumhigh
null: the infobox leaves segmentum, sector, subsector and system blank and files the world under 'Segmentum Unknown'.
gposlow
inferred: NAMED but never located, so no segmentum is claimed and the record sits on the unsurveyed rim at the generator's rim_xy('orthoda-rex') = [884.0, 732.7] (build_locations.py's function evaluated on its own, reproducing heliogabalus, chevreuse and kallash; the script itself was not run). The position carries no information. Z -10.5 is the zPolicy value (compute-z.mjs orthoda-rex 884.0 732.7).
classmedium
'shrine': a Cardinal World is a world ruled by the Ecclesiarchy (Lexicanum files it under the Ecclesiarchy portal), and its one described feature is a walled capital city, which is what the dataset's shrine palette draws. No terrain or colour words are published.
erasmedium
m41 only, the era of the book that names it; the uprising is undated and is the Titan's past, so no other era is asserted. Allegiance 'imperium': the cultists were held off and the world kept.
systemIdlow
editorial: 'orthoda-rex', the world's own name; no source names a system, star or other body. No survey authored: the world is MENTIONED, not the book's setting.