This archive tracks four layers. A record present in 1 of them (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
[RECORD LOST]
No record for this location in The 41st Millennium.
Era Indomituspost-Rift
imperium
Viper Legion homeworld
Homeworld of the Viper Legion, a Space Marine Chapter based in the Aurelius System and counted among the Astartes Praeses who guard the region around the Eye of Terror. Named late in Redemption Corps; what brings it into the story is in the book's spoiler.
Position
Map frame: 120.7, 262.4 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 448 units ≈ 47.6k light years, north-west of the galactic core.
Height above the disk plane: 4.3 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Aurelius 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/Aurelius_(Adeptus_Astartes_Homeworld ) (read directly in a browser on 2026-10-02): 'the Homeworld of the Viper Legion Chapter', infobox Affiliation 'Imperium (Viper Legion)', Class 'Adeptus Astartes Homeworld', Tithe Grade Aptus Non, cited to Redemption Corps (Novel), ch. 7 s. 6. https://wh40k.lexicanum.com/wiki/Viper_Legion: 'based in the Aurelius System' (same chapter); 'among the Astartes Praeses' (Architect of Fate insert). https://wh40k.lexicanum.com/wiki/Cape_Wrath (ch. 7) names it as the frigate's destination. NAME-COLLISION CHECK: Lexicanum disambiguates this Aurelius from other uses of the name (its title carries '(Adeptus Astartes Homeworld)'); no other index record uses the name.
segmentummedium
null: Lexicanum Aurelius's infobox has Segmentum, Sector and System empty and the page is filed 'Segmentum Unknown'. The Viper Legion's place among the Astartes Praeses (Lexicanum Viper_Legion, citing Architect of Fate's 'Eye of Terror Containment' picture-list) is a statement about the Chapter's duty, not its homeworld's position, so it is not used to claim Obscurus.
classlow
'temperate', editorial: no permitted source gives a terrain, climate or colour word for Aurelius, and 'Adeptus Astartes Homeworld' is a role, not a look ('fortress' would repeat the Macragge error of ADDING-A-BOOK Step 5a2). The neutral palette is drawn and nothing is claimed by it.
gposlow
inferred: no permitted source names a segmentum, sector or neighbour for Aurelius, so the record claims no segmentum and sits on the unsurveyed rim at the generator's rim_xy('aurelius') = [120.7, 262.4] (ported function, checked against beshic-v and cressida; the script itself was not run). The position carries no information and must not be read as one; its nearness to the Eye of Terror on the screen is the id hash, not the Astartes Praeses lead. Z 4.3 is the zPolicy value (compute-z.mjs aurelius 120.7 262.4).
erasmedium
indomitus only, the era the shelf files Redemption Corps in. Mentioned in the novel (ch. 7 s. 6), not visited on any permitted account. Allegiance 'imperium'.
systemIdmedium
'aurelius': the Viper Legion is 'based in the Aurelius System' (Lexicanum Viper_Legion). No systems/aurelius.json is authored (a mentioned world with nothing enumerated; ADDING-A-BOOK Step 5b).