This archive tracks four layers. A record present in 4 of them (HH, AoI, M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
imperium
Homeworld of Angron and the XII Legion; killed by him
A world whose ruling houses bought and fought gladiators, and cut the Butcher's Nails into the best of them. Angron came back during the Shadow Crusade and did to Nuceria exactly what the Nails had been telling him to do for two centuries.
Age of the ImperiumM32–M40
none
Dead world
Scoured. The World Eaters kept no homeworld after this.
The 41st Millenniumpre-Rift
none
Dead world
Empty, and still the reason the XII Legion has no home to go to.
Era Indomituspost-Rift
none
Dead world
Still empty. Angron is a daemon prince loose in the galaxy and the world that made him is the one thing he has finished with.
Position
Map frame: 685, 635 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 229 units ≈ 24.4k light years, south-east of the galactic core.
Height above the disk plane: 1.5 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Nucerian System
Books set here
3 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/Nuceria infobox Class = 'Dead World', which is its state after this record's aoi entry and is carried by the aoi and m41 statuses. For the living world the class is editorial: https://wh40k.lexicanum.com/wiki/Nuceria §History describes 'a brutal, unforgiving world run by cruel slavemasters from the city of Desh'ea' with gladiatorial arenas and named cities, so it is rendered temperate as this dataset's neutral inhabited default. No terrain type is published; low confidence and marked as ours
gposlow
derived: Ultima Segmentum. Angron reached it from the Shadow Crusade's operations in and around Ultramar, so it is placed just south-east of the Ultramar cluster, inside the Astronomican's reach. Relational, and the weakest kind of relational — no bearing is published
era-indomitushigh
this entry exists to close a rendering gap, not because a new source appeared. app/src/stages/system.js draws a planet in every era whether or not its record carries that era, and derives a destroyed world's grey from eras[era].status — so an era key the record does not carry falls back to the survey class and the world comes back to life in it. With the baseline moved to this world's LIVING appearance, a missing indomitus key would have done exactly that. The status carries forward what the preceding era already states, on the same source; nothing new is claimed