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
necron
Sautekh tomb world of Nemesor Zahndrekh
A Necron tomb world of the Sautekh Dynasty, given to Zahndrekh long before the Great Sleep as his reward for victory at Yama in the Wars of Secession. Unimportant at first, it has grown under his generalship into a miniature empire ruling a dozen star systems, its court guarded by Vargard Obyron against the nobles who would depose its mad nemesor.
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
Position
Map frame: 850, 430 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 357 units ≈ 38k light years, east of the galactic core.
Height above the disk plane: 10.0 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Gidrim 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/Gidrim (read directly in a browser on 2026-10-05): 'a Necron Tomb World that forms a part of the Sautekh Dynasty of Imotekh the Stormlord. Ruled over by the Nemesor Zahndrekh, it has expanded into a miniature empire to the point of including a dozen star systems' (Codex: Necrons 5th ed. p. 60); infobox Segmentum: Ultima Segmentum, Sector: Unknown. https://wh40k.lexicanum.com/wiki/Zahndrekh: 'As a reward for his triumph in Yama, he was given the world of Gidrim' (Severed ch. 3); https://wh40k.lexicanum.com/wiki/Obyron: Obyron 'has personally put down rebellions by members of Gidrim's court' (Codex: Necrons 9th ed.). NAME-COLLISION CHECK: no index record uses the id or label.
book-joinmedium
MENTIONED for Severed: Zahndrekh's home world, named in the novella's chapter 3 account of how he came by it (Lexicanum Zahndrekh, footnote 4b). Not a setting of the novella on any permitted source.
segmentumhigh
ultima: Lexicanum Gidrim infobox, 'Ultima Segmentum' (category Ultima Segmentum).
classlow
'dead', with no look words to go on: neither Lexicanum Gidrim nor the Zahndrekh, Obyron or Severed pages describe its surface. The dark grey ramp is the dataset's neutral picture of a Necron tomb world (as for Khemet) and asserts nothing about terrain; revisit if a source describes the world.
gposlow
inferred: segmentum-level, the weakest tier. Canon publishes 'Ultima Segmentum', sector unknown. The only bearing is Zahndrekh's reputation, 'a military genius along the Eastern Fringe' (Lexicanum Zahndrekh, citing Codex: Necrons 5th ed. p. 60, the webstore and the 9th ed. codex), which is where his campaigns run, not a stated location for his world. Placed at (850, 430) east of the regions.json Eastern Fringe label (790, 410), inside the 'ultima' polygon (101 units in from its edge, checked), 356.9 units from the core, with no marker within 25 units. Z 10 is the zPolicy value (compute-z.mjs gidrim 850 430).
erasmedium
m41 only: the Codex 5th ed. state (Gidrim ruling a dozen systems), the era of every source that names it.
systemIdlow
'gidrim', named for the world: no source names its star or the dozen systems it rules. No survey file: a mentioned world, and the synthesised system is the render.