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
contested
Source of an astropathic distress call; Tyranid landings
A far-flung world whose enigmatic astropathic call for help brings the newly merged Tallarn 892nd Desert Raiders, under Colonel Nisri Dakar and Prince Iban Salid, to investigate. In Desert Raiders the feuding Tallarn find themselves in a running battle with wave upon wave of Tyranids.
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
Position
Map frame: 644.8, 928.9 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 453 units ≈ 48.2k light years, south of the galactic core.
Height above the disk plane: 7.3 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Khadar 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.
identitymedium
wh40k.lexicanum.com/wiki/List_of_Tallarn_units (read directly in a browser on 2026-10-01), 892nd row: 'The 892nd battled Tyranids on Khadar under the direction of Commissar Rezail', in a row whose other facts cite Desert Raiders (Novel) pp. 14-16; this sentence itself carries Lexicanum's [Help] citation-needed marker. https://wh40k.lexicanum.com/wiki/Desert_Raiders_(Novel) (read 2026-10-01): Black Library's description, 'an enigmatic call for help from a far-flung planet', and the plot summary, 'Sent to a planet from which an astropath distress call originates'; neither names the world. Lexicanum has no Khadar article and Planets_(List) does not carry it. NAME-COLLISION CHECK: Lexicanum's full-text search for 'Khadar' returns only the List_of_Tallarn_units row; no other index record uses the name.
classlow
editorial: 'temperate', the palette's neutral default, because no permitted source describes what Khadar LOOKS like. Black Library's description says only 'a far-flung planet', and Lexicanum's pages name it without terrain words. 'desert' was refused: 'Desert Raiders' names the Tallarn regiments after their homeworld, not this world (ADDING-A-BOOK Step 5a2). Reopen when a permitted host describes the world's terrain.
segmentumhigh
null: no permitted source gives a segmentum, sector, subsector or system for Khadar (Lexicanum has no article; List_of_Tallarn_units and Desert_Raiders_(Novel) give none; read 2026-10-01).
gposlow
inferred: no published segmentum, sector, subsector or bearing. No segmentum is claimed; unsurveyed rim, no positional information. [644.8, 928.9] is build_locations.py rim_xy('khadar') (the function's arithmetic reproduced and checked against rogar-iii's [211.5, 165.0] and jumael-iv's [205.2, 822.6], the script not run); Z 7.3 from compute-z.mjs under zPolicy.
erasmedium
Only 'm41' is carried: Desert Raiders (December 2007) is undated in every permitted source, and the shelf files it M41 — Pre-Great Rift with the rest of the classic Imperial Guard run. 'contested' because the Imperial Guard and the Tyranids fight for it (Lexicanum Desert_Raiders_(Novel) plot summary: 'the Tyranid landings').
systemIdlow
editorial: 'khadar', the world's own name, because no permitted source names a star or a system. systems/khadar.json is a one-body TRUNCATED survey, authored because this is the novel's PRIMARY setting.