This archive tracks four layers. A record present in 2 of them (M41, IND) 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
chaos
Iron Warriors fortress world, then an ork one
A world the Iron Warriors turned into a single fortification and then lost to greenskins, which is the most humiliating thing that could have happened to it.
Era Indomituspost-Rift
ork
Ork world
[RECORD LOST]
Nothing survives in the archive for Era Indomitus.
Position
Map frame: 606.8, 920.6 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 434 units ≈ 46.2k light years, south of the galactic core.
Height above the disk plane: 2.9 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Castellax System
Books set here
1 title in the reading tracker touches this record, 1 of them as a primary location. Titles link out to the tracker.
Every fact in this record, and where it came from. Editorial derivations say so.
classhigh
wh40k.lexicanum.com/wiki/Castellax infobox Class = 'Ork World, former Fortress World'; Affiliation = 'Orks, formerly Iron Warriors'; no segmentum, sector, subsector or system
gposlow
inferred: no published segmentum, sector, subsector or system, and no article places the world against a neighbour or a theatre. No segmentum is claimed; unsurveyed rim, no positional information.