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
imperium
Garden of Ultramar
The showpiece of Ultramar's agriculture and the realm's second world in every way that mattered — a place Ultramarines were taken to see.
Era Indomituspost-Rift
imperium
Plague War epicentre
Mortarion picked it precisely because of what it had been, and worked it as the lever that would drag the whole of Ultramar into the warp. Guilliman and his brother finished the Plague War on its ruined surface.
Position
Map frame: 676, 578 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 193 units ≈ 20.5k light years, south-east of the galactic core.
Height above the disk plane: -0.4 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Iax System
Books set here
2 titles in the reading tracker touch this record, 1 of them as a primary location. Titles link out to the tracker.
wh40k.lexicanum.com/wiki/Iax infobox Class = 'Death World; (former Paradise World/Agri World)'; §Overview — 'Iax was an Agri World whose climate and fertility has made it one of the most productive worlds in the Imperium'. Both halves of that infobox are in this record and they are its two eras, so the baseline is the FIRST — agri, the Garden of Ultramar, which is what the m41 status calls it and what the world is named for — and the Death World half is carried as an explicit class on the indomitus entry. It was previously rendered death throughout, which painted the Imperium's most productive agri world in toxic bile-green in the one era it was still a garden
era-indomitus-classhigh
wh40k.lexicanum.com/wiki/Iax 'During the Plague Wars, Iax became the site of major fighting'. This is the one change the status route cannot express: app/src/stages/palettes.js STATUS_CLASS only ever answers `dead` or `daemon`, and Iax does not become either. It becomes a Nurgle plague world, which is precisely what this palette set's `death` is — virulent bile-green under a heavy toxic deck. The explicit class says so; no wording of the status could have
gposmedium
derived: a named world of Ultramar, so it is placed inside the existing Ultramar cluster beside Macragge, Calth, Espandor and Talassar rather than given an independent position