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
chaosImperium Sanctus
Held by the Death Guard; lost to the Imperium for over a decade
A reach of worlds out past Ultramar's frontier, and the whole setting of Master of Rites. Warhammer Community: 'The Khorsari Reach has been lost to the Imperium for over a decade, its worlds claimed by the pestilent legions of the Death Guard' and its people 'slaughtered by the servants of Nurgle'. So near the Great Rift that Chaos forces there surge with power, it is described as having become part of the Plague God's domain, and Ferren Areios takes the Ultramarines Sixth Company into it to break Nurgle's grip on what the publisher calls Ultramar's rightful worlds. Not one of those worlds is named anywhere permitted, which is why this record stands for the Reach as a group rather than for a planet.
Position
Map frame: 726.3, 593.8 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 245 units ≈ 26.1k light years, south-east of the galactic core.
Height above the disk plane: 0.6 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Khorsari Reach Worlds 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.
settinghigh
www.warhammer-community.com/en-gb/articles/amxn8f1q/sunday-preview-get-into-the-melee-with-assault-terminators-and-chaos-marauders/ NAMED BY THE PUBLISHER, TWICE, AND BY NOBODY ELSE. (16 November 2025) and https://www.warhammer-community.com/en-gb/articles/c4icjvyy/sunday-preview-space-marines-drop-in-from-orbit/ (13 September 2026) both open this book's entry with the same sentence: 'The Khorsari Reach has been lost to the Imperium for over a decade, its worlds claimed by the pestilent legions of the Death Guard. Ferren Areios, Captain of the Ultramarines Sixth Company, has pledged to cleanse these worlds and claim vengeance for the people slaughtered by the servants of Nurgle, but in doing so he may well be pushed to the limits of his Chapter's creed.' https://www.warhammer-community.com/en-gb/articles/amxn8f1q/sunday-preview-get-into-the-melee-with-assault-terminators-and-chaos-marauders/ also has the French and German editions described as 'the lengths Ferren Areios has to go to in order to claim back the Khorsari Reach'. https://wh40k.lexicanum.com/wiki/Master_of_Rites_(Novel) carries the reveal's own words for the same place without using the name: 'Captain Areios is dispatched to the far reaches of Ultramar to retake worlds long since lost to the Death Guard, where proximity to the Great Rift means Chaos forces surge with power', and 'can the experienced leader rally his troops and break Nurgle's grip on Ultramar's rightful worlds?' A Lexicanum search for 'Khorsari' on 14 September 2026 returns NO RESULTS and there is no Khorsari Reach article, so this book's own publisher copy is the entire canon of the place.
typehigh
A REACH IS NOT A TYPE THIS INDEX CARRIES, and this record is the same compromise the index already makes twelve times over — 'Unnamed worlds of the Caradryad Sector (The Horusian Wars)', 'Unnamed worlds of the Damocles Gulf', 'Unnamed worlds of the T'au front (War of Secrets)' are all filed type 'planet'. The schema's four types are planet, moon, station and ship (warhammer-3d-map/docs/SCHEMA.md), so a region of worlds is carried as one record standing for its worlds, and the globe the reader sees is one representative world of the Reach drawn in the palette the whole Reach is described in — not a claim that the Khorsari Reach is a single planet. The label says 'Worlds of' for that reason and the canon name is kept as an alias so search still finds 'Khorsari Reach'. What was REFUSED: a record for the Reach as a region, which regions.json is for and which does not join to books; and splitting it into member worlds, because no permitted source names one.
segmentummedium
wh40k.lexicanum.com/wiki/Master_of_Rites_(Novel ULTIMA, on Ultramar. ) places the campaign 'in the far reaches of Ultramar' and calls the objective 'Ultramar's rightful worlds'; https://www.warhammer-community.com/en-gb/articles/1vfc3phb/ferren-areios-ultramarines-sixth-company-captain-and-master-of-the-rites/ (18 November 2025) is more precise still — the post-Plague Wars duty 'has brought Ferren Areios and his company to the very border of the 500 Worlds of old, isolated in what has become part of the Plague God's domain'. Ultramar and Macragge are Segmentum Ultima in this index and on https://wh40k.lexicanum.com/wiki/Ultramar, so a reach on Ultramar's border is Ultima. This is a theatre-level attribution and not a published address: no permitted source names a sector or subsector for the Khorsari Reach.
classmedium
www.warhammer-community.com/en-gb/articles/9jjd0ot7/dawn-of-fire-hero-ferren-areios-battles-to-reclaim-plague-ridden-worlds-in-new-spin-off-novel-master-of-rites/ DEATH — the bile-green, toxic, olive-canopy palette (warhammer-3d-map/app/src/stages/palettes.js: 'Virulent bile-green landmass under a heavy toxic deck. Nothing here is a colour anything would evolve to live in.'). There is no infobox to misread here, which is the usual trap: Lexicanum has no article on the Khorsari Reach at all, so the class comes only from the appearance words the publisher uses — 'the pestilent legions of the Death Guard', 'the servants of Nurgle', the worlds being 'part of the Plague God's domain', and the corruption of the Plague God 'eating away at his humanity' (, https://www.warhammer-community.com/en-gb/articles/1vfc3phb/ferren-areios-ultramarines-sixth-company-captain-and-master-of-the-rites/). A Nurgle-held world is the one thing this palette was actually painted as. REFUSED: 'daemon', whose ramp is bruise-purple through arterial red with a warp-driven phase — the look of possession and Khornate or undivided ruin, not of rot; 'dead', because these are populated worlds whose people were slaughtered rather than an airless cinder; 'agri' and 'temperate', which is what a Nurgle-claimed border world of Ultramar might have been before and is not now. Only 'indomitus' carries a class here, because only 'indomitus' carries an era.
gposlow
www.warhammer-community.com/en-gb/articles/1vfc3phb/ferren-areios-ultramarines-sixth-company-captain-and-master-of-the-rites/: inferred: canon publishes no coordinate, no sector and no neighbour for the Khorsari Reach — only a bearing, and this position is that bearing executed in this frame. the Reach is at 'the very border of the 500 Worlds of old'; https://wh40k.lexicanum.com/wiki/Master_of_Rites_(Novel): 'the far reaches of Ultramar'. The seven Ultramar worlds this index already holds (macragge, calth, iax, talassar, espandor, sotha, parmenio) have a centroid of [682.7, 575.7], which is 197.8 units out from the core on the unit bearing (0.9237, 0.3827); their outermost member, parmenio, sits at 226.4. This record is set further out along that same bearing at r = 245, giving [726.3, 593.8] — beyond every world of the realm, on the realm's own axis away from the galactic core, which is what 'the far reaches' and 'the very border' mean and is the only thing either phrase fixes. THE MAGNITUDE IS EDITORIAL: nothing published says how far past Parmenio the Reach lies, and 245 was chosen because it clears the outermost Ultramar world while leaving the nearest existing record, Sycorax on Ultramar's frontier, 22.3 units away, so both stay selectable. Z is the index's own zPolicy jitter from tools/compute-z.mjs (0.6, artistic and deterministic per id), never hand-picked. The stylised 'ultima' boundary polygon in regions.json contains the point, checked before it was written.
erashigh
www.warhammer-community.com/en-gb/articles/amxn8f1q/sunday-preview-get-into-the-melee-with-assault-terminators-and-chaos-marauders/ ONLY 'indomitus', and the silence elsewhere is deliberate. Every permitted statement about the Khorsari Reach is about its state in this book's present: lost 'for over a decade', Death Guard-held, near the Great Rift (, https://www.warhammer-community.com/en-gb/articles/c4icjvyy/sunday-preview-space-marines-drop-in-from-orbit/, https://wh40k.lexicanum.com/wiki/Master_of_Rites_(Novel)), which puts the whole record after the Rift opened and inside M42. Nothing published says what the Reach was in M41, M31 or the Age of Imperium Ascendant. The tempting reading was REFUSED: 'https://www.warhammer-community.com/en-gb/articles/1vfc3phb/ferren-areios-ultramarines-sixth-company-captain-and-master-of-the-rites/' places the Reach at 'the very border of the 500 Worlds of old', and 'of old' attaches to the historic extent of Ultramar rather than promising that these worlds were inside it, so an 'm41' entry calling them Imperial worlds of Ultramar would be an invention. 'riftSide: sanctus' follows from Ultramar being Imperium Sanctus (https://wh40k.lexicanum.com/wiki/Ultramar; macragge's own indomitus entry in this index) — the Reach is cut off and overrun, not on the far side of the Rift. 'allegiance: chaos' is the publisher's own 'claimed by the pestilent legions of the Death Guard'; 'contested' was refused because the book opens with the Reach already lost and Areios only pledging to retake it.
no-system-surveyhigh
NO systems/khorsari-reach-worlds.json IS AUTHORED, and for this record that is the honest ceiling rather than a shortcut. ADDING-A-BOOK.md Step 5b makes a new book's primary setting a reason to author a Tier 2 survey, and this is Master of Rites' only join — but a survey is a star, a body list and a note on whether that list is closed, and canon publishes NONE of the three here: no star, no planet name, no moon, no count, not even how many worlds the Reach holds. A survey would therefore be entirely invented, and a single star with a single planet would additionally contradict the one thing the sources do say — that the Reach is a group of worlds. The map's synthesiser draws this record from its own class and seed = hashId(id) % 97, which is the whole of what is known, so the reader gets a globe and no false geography. UPGRADE CANDIDATE the moment a permitted host names one world of the Reach: at that point the named world gets its own record, this aggregate keeps the ones still unnamed, and a survey becomes possible.