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
contested
Imperial hive world; a second daemonic incursion in the Sandava System
The Sandava System's hive world, sister to Sandava II, and the second world of the system to suffer a daemonic incursion. Warden of the Blade's prologue and epilogue are set here, and the Grey Knights under Castellan Garran Crowe go on to fight on it.
Era Indomituspost-Rift
contested
Hive world swallowed by the Great Rift
Engulfed by the warp storm of the Cicatrix Maledictum as the Great Rift opens at the end of M41, with Castellan Garran Crowe's Grey Knights and Canoness Setheno's Sisters of Battle still fighting daemons and Noise Marines in Hive Skoria. Castellan is set here; what becomes of the world is the novel's to tell.
Position
Map frame: 110.4, 287.6 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 444 units ≈ 47.2k light years, north-west of the galactic core.
Height above the disk plane: 10.4 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
Every fact in this record, and where it came from. Editorial derivations say so.
identityhigh
wh40k.lexicanum.com/wiki/Sandava_System (read directly in a browser on 2026-10-03): 'a star system of Imperial space that has suffered at least two Daemonic incursions' (Warden of the Blade, Prologue, ch. 5), 'located in the same subsector as the Dierna System' (ch. 1); Known Planets: Sandava II 'Formerly an Agri World' and Sandava III 'Hive World' (Prologue); 'At the end of M41, the system was one of many across the galaxy to be engulfed by the Warp Storm known as the Great Rift' (Castellan, ch. 1); the page is filed under 'Segmentum Unknown'. https://wh40k.lexicanum.com/wiki/Daemon ('and later - on Sandava III', Warden of the Blade Prologue, Epilogue) and https://wh40k.lexicanum.com/wiki/Garran_Crowe (Crowe deploys to Sandava III in the Epilogue; Hive Skoria, citing Castellan chs. 2-3), read directly in a browser on 2026-10-03. The Lexicanum page Sandava_III itself does not exist (checked 2026-10-03). NAME-COLLISION CHECK: no index record uses the id or label.
book-joinhigh
VISITED for Warden of the Blade (grey-knights::gk-crowe::1): the prologue and epilogue (Lexicanum Daemon fn. 13b; Sandava_System 1a). PRIMARY for Castellan (grey-knights::gk-crowe::2, added 2026-10-03): Black Library's description (via Lexicanum Castellan_(Novel)) names 'the planet he and his strike force are fighting on, Sandava III', swallowed by the Cicatrix Maledictum; Lexicanum Garran_Crowe chs. 2-4 (Hive Skoria) and Sandava_System ch. 1; Grey Knights timeline '~999.M41 - The Battle for Sandava II and Sandava III against the forces of Slaanesh as the Great Rift erupts' (Castellan chs. 2-3), all read directly in a browser on 2026-10-03.
segmentumhigh
null, as Sandava II: Lexicanum files the system under 'Segmentum Unknown'.
classmedium
'hive': 'Sandava III - Hive World' (Lexicanum Sandava_System, Prologue) and its Hive Skoria (Lexicanum Garran_Crowe, citing Castellan chs. 2-3). No other terrain is described; a hive-covered world is what the hive palette paints.
gposlow
inferred: the same system as Sandava II, so the same unsurveyed-rim x, y, rim_xy('sandava-ii') = [110.4, 287.6]. The position carries no information. Z 10.4 is the zPolicy value (compute-z.mjs sandava-iii 110.4 287.6). Castellan's later chapters change where the world is (Lexicanum Garran_Crowe chs. 5-6; kept to the catalogue SPOILERS field), but no permitted source gives a position before or after, so one rim position stands for both eras.
erasmedium
m41 for Warden of the Blade; indomitus added 2026-10-03 for Castellan: 'At the end of M41, the system was one of many across the galaxy to be engulfed by the Warp Storm known as the Great Rift' (Lexicanum Sandava_System, Castellan ch. 1), the Grey Knights and Setheno's Sisters fighting daemons and Noise Marines in Hive Skoria (Garran_Crowe chs. 2-3). Allegiance 'contested'. The status names no destruction, so the hive class stands (palettes.js STATUS_CLASS): the hive's fate in chapter 4 and the world's displacement are the book's spoilers and are kept out of the era text. No riftSide is declared: the rim position is not a real one, so the spline cannot be asked which side it is on.
systemIdhigh
'sandava': Lexicanum Sandava_System; a body of systems/sandava.json.