This archive tracks four layers. A record present in 3 of them (AoI, 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
imperium
Claimed by right of conquest
A lost human world found after the Second Founding, whose natives had survived their own jungle by becoming worse than it. The Flesh Tearers took it as a homeworld on the spot and named it 'Birth of Wrath'.
The 41st Millenniumpre-Rift
imperium
Flesh Tearers homeworld
Fourth planet of its system and a death world in the plain sense: the flora and fauna kill, constantly, and the recruits are the ones that outlast them.
Era Indomituspost-Rift
imperium
Cut off, then reclaimed
Isolated for twenty years behind the Rift and found overrun by genestealer cults and a Chaos warband when contact was finally re-established. It was taken back.
Position
Map frame: 455, 745 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 249 units ≈ 26.5k light years, south of the galactic core.
Height above the disk plane: 4.7 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Corythos 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.
segmentumhigh
wh40k.lexicanum.com/wiki/Corythos_System 'a star system of Imperial space located in the Segmentum Tempestus'; https://wh40k.lexicanum.com/wiki/Cretacia — infobox System = Corythos System
classhigh
wh40k.lexicanum.com/wiki/Cretacia infobox Class = 'Adeptus Astartes Homeworld, Death World'; https://wh40k.lexicanum.com/wiki/Planets_(List) adds Jungle World
gposlow
derived: Segmentum Tempestus, no published sector. Placed in the Tempestus interior inside the Astronomican, since it was a tithed Chapter homeworld with regular fleet contact until the Rift