This archive tracks four layers. A record present in 3 of them (HH, M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
imperium
Forge world brought into compliance by the Emperor
A forge world since the Dark Age of Technology whose people worshipped a dragon-god, until the Emperor came to Shenlong in person during the Great Crusade and forced it into compliance. Among those killed was the maker of Lantern, the weapon that became Mortarion's sidearm. The Ikari Fortress, its governor's palace and bastion, was raised in this era as a manufacturing hub and supply base for the Crusade.
Age of the ImperiumM32–M40
[RECORD LOST]
No record for this location in Age of the Imperium.
The 41st Millenniumpre-Rift
contested
Forge world taken by the Word Bearers, then liberated by the Blood Angels
In late M41 Word Bearers spies open the gates of the all-but-impregnable Ikari Fortress and the traitors take Shenlong intact. A Blood Angels force pursuing them from Cybele storms the fortress at heavy cost, and the deed swells the legend of Battle-Brother Arkio, whom the Shenlongi and the Blood Angels alike begin to acclaim as Sanguinius reborn.
Era Indomituspost-Rift
none
Dead world, destroyed by Exterminatus
After the Arkio Insurrection the Shenlongi too eagerly embrace the Word Bearers again, and Chief Librarian Mephiston judges them too tainted to live and orders Exterminatus. By the Era Indomitus Shenlong is a dead world.
Position
Map frame: 680, 200 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 350 units ≈ 37.2k light years, north-east of the galactic core.
Height above the disk plane: 1.9 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Shenlong System
Books set here
3 titles in the reading tracker touch 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/Shenlong (read directly in a browser on 2026-10-02): 'a Forge World in the Ultima Segmentum which was subjected to Exterminatus after falling to the forces of Chaos'; class 'Former Forge World, now — Dead World'; the dragon-god, the Emperor's compliance and Lantern's maker (The Flight of the Eisenstein ch. 1 pg. 30; Lantern's Light); Word Bearers capture and Blood Angels liberation, the Warriors of the Reborn, Mephiston's Exterminatus (The Blood Angels Omnibus). https://wh40k.lexicanum.com/wiki/Ikari_Fortress (read directly in a browser on 2026-10-02): the citadel of 'the forge world of Shenlong', governor's palace and bastion, a manufacturing hub and supply base for the Crusade; spies open the gates to the Word Bearers in 999.M41; the Blood Angels capture it (Deus Encarmine; Deus Sanguinius). NAME-COLLISION CHECK: Lexicanum full-text search for 'Shenlong' returns only this world, the Shenlongi and pages that cite it; no index record uses the id or label.
book-joinmedium
PRIMARY for Deus Encarmine (blood-angels::ba-rafen::1): the second half of the novel is the assault on the Ikari Fortress and Arkio's acclaim there (Lexicanum Koris, chs. 9-11; Arkio, ch. 14; Ikari_Fortress). MENTIONED for The Flight of the Eisenstein (horus-heresy::hh-main::4): Lexicanum Shenlong cites ch. 1, pg. 30 for the Emperor's compliance of the world and Lantern's maker, told as background; medium, because no scene is placed there.
segmentumhigh
wh40k.lexicanum.com/wiki/Shenlong infobox: Segmentum 'Ultima Segmentum' (cited to The Blood Angels Omnibus); category Ultima Segmentum. Sector, subsector and system Unknown.
classmedium
FORGE for hh and m41, medium: no page gives terrain or colour words, but both describe an industrial world, a forge world 'since the Dark Age of Technology' (Lexicanum Shenlong) whose fortress made it 'a manufacturing hub and supply base' (Lexicanum Ikari_Fortress), which is what this dataset's forge palette draws. indomitus is DEAD via an authored eras.indomitus.class, because the world was destroyed by Exterminatus in late M41 (Lexicanum Shenlong: 'now, Dead World'); the m41 era keeps forge, the state its book is set in, because the Exterminatus comes at the end of the saga's second book.
gposlow
inferred: segmentum-level. Canon places Shenlong in the Ultima Segmentum and publishes no sector, subsector, bearing or neighbour (Lexicanum Shenlong). Placed at [680, 200], inside the stylised 'ultima' polygon (62 units from its edge, checked), 92 units from Cybele and about 100 from Baal, so it implies no neighbour. The coordinate claims nothing finer than 'somewhere in the Ultima Segmentum'. UPGRADE CANDIDATE: a published sector would replace it. Z 1.9 is the zPolicy value (compute-z.mjs shenlong 680 200).
erasmedium
hh: the Great Crusade compliance (Lexicanum Shenlong, The Flight of the Eisenstein ch. 1) and the fortress 'Built during the Great Crusade' (Lexicanum Ikari_Fortress). m41: the Word Bearers capture in 999.M41 and the Blood Angels liberation (Ikari_Fortress; Shenlong). indomitus: dead after the Exterminatus Lexicanum Shenlong attributes to Mephiston; no shelved book is set there in that era, so the entry only keeps the render honest. Allegiance 'contested' for m41, 'none' for indomitus (Lexicanum: Affiliation None, population None).
no-system-surveyhigh
No systems/shenlong.json: although it is a PRIMARY setting, canon enumerates nothing about its system (Lexicanum Shenlong's System field reads Unknown; no star, no sibling world), so an authored survey would contradict the source.
systemIdlow
shenlong — editorial: Lexicanum gives no system name, so the record names its own synthesised system, as other unenumerated worlds in this index do.