This archive tracks four layers. A record present in 1 of them (M41) 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
Remote, sunless Imperial hive world
A remote and sunless Imperial hive world, about two days' travel from the Eastern Fringe colony of Baih'Rus, its hive standing in an icy wilderness. An Ordo Xenos investigation under Inquisitor Ipoqr Kaustus comes here looking for minor corruption and heresy, and finds a Night Lord of the Heresy loose in the underhive and his Legion's invasion on the way.
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
Position
Map frame: 860, 506 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 360 units ≈ 38.3k light years, east of the galactic core.
Height above the disk plane: 8.4 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Equixus 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.
identityhigh
wh40k.lexicanum.com/wiki/Lord_of_the_Night_(Novel Black Library's cover description on ) (read in a browser 2026-10-05): 'When they visit the remote and sunless hive-world of Equixus, she suspects nothing more than minor corruption and heresy.' Warhammer Community, Saturday Pre-orders: Welcome to the Black Library Celebration (10 Feb 2024, https://www.warhammer-community.com/en-gb/articles/7tMfwyAe/saturday-pre-orders-welcome-to-the-black-library-celebration/, read through its Internet Archive copy of 13 Jan 2025): 'the sunless hive-world of Equixus is about to become the target of a Night Lords invasion'. Lexicanum has no Equixus article (the page does not exist, checked 2026-10-05); Zso_Sahaal, Krieg_Acerbus, Mita_Ashyn and List_of_Inquisitors all place the novel there. NAME-COLLISION CHECK: no index record uses the id or label.
book-joinhigh
PRIMARY for Lord of the Night: the whole novel is set on Equixus (Black Library's description; Warhammer Community 10 Feb 2024; Lexicanum Zso_Sahaal and Krieg_Acerbus citing Part Five 'Dominus Nox' and the Epilogue; List_of_Inquisitors citing Part One for Kaustus's investigation there).
segmentummedium
ultima, inferred from one bearing: Lexicanum Baih'Rus (citing Lord of the Night, Epilogue) calls Baih'Rus 'a Colony World in the Eastern Fringe' 'located roughly two days travel from the world of Equixus'. The Eastern Fringe is the outer edge of Ultima Segmentum (regions.json outerRegions 'eastern-fringe'). No source names Equixus's own sector or segmentum.
classlow
'ice', painted from the one terrain word any permitted source gives: Sahaal 'managed to escape into the icy wilderness of Equixus' (Lexicanum Krieg_Acerbus, citing Part Five). Not 'hive': the hive is the setting's type, not its look from orbit, and both official descriptions stress that the world is SUNLESS, which a hive palette's lit city-glow would contradict less well than a dark ice ramp does. Revisit if a source describes the surface further.
gposlow
inferred: region-level. The only bearing is two days' travel from Baih'Rus, itself only 'in the Eastern Fringe' (Lexicanum Baih'Rus, citing the Epilogue). Placed at (860, 506), inside the 'ultima' polygon about 95 units in from its edge and east of the regions.json Eastern Fringe label (790, 410), with Baih'Rus 15.6 units away to show the stated short hop; no other marker within 25 units (nearest Watch Fortress Erioch at 33). Z 8.4 is the zPolicy value (compute-z.mjs equixus 860 506).
erasmedium
m41 only: the novel is set ten thousand years after Sahaal's disappearance at the end of the Heresy (Black Library's description, 'in exile for ten thousand years'), before Soul Hunter, whose Talos already remembers Sahaal's failed bid for the Legion (Lexicanum Zso_Sahaal citing Soul Hunter ch. 8). The era summary is spoiler-safe on purpose: what the invasion does to the world is in the book's SPOILERS entry, not here.
systemIdlow
'equixus', named for the world: no source names its star or any sibling body.
no-system-surveyhigh
NO systems/equixus.json is authored, although Equixus is Lord of the Night's PRIMARY setting: canon enumerates nothing about the system, no star, no sibling body, not even a body count, and the one thing both official descriptions say is that the world is SUNLESS. An authored survey would have to invent a star (normaliseSystem() writes spectral class 'G' for a file that omits one), contradicting that. The Hesperax precedent ('never touched by sunlight'). The synthesiser draws the world from this record's class and seed = hashId('equixus') % 97. Reopen if a permitted source names its star or another body.