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
chaos
Blackstone Fortress, seat of the Hand of Abaddon
The reach where the cabal called the Hand of Abaddon kept its Blackstone Fortress, and where it gathered the shards of a reforged Anathame. The fortress fought its boarders itself — spikes out of the walls, corridors that rearranged around them — and what was left of it was handed to the Kin to strip.
Position
Map frame: 851.8, 245.6 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 434 units ≈ 46.2k light years, north-east of the galactic core.
Height above the disk plane: -11.4 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Stygius Gilt 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.
identityhigh
wh40k.lexicanum.com/wiki/Leonid_Rostov The record stands for the Hand of Abaddon's Blackstone Fortress and the reach it held station in, which canon names only together: — 'the Hand's base, a Blackstone Fortress at the Stygius Gilt'; https://wh40k.lexicanum.com/wiki/Battle_of_the_Stygius_Gilt infobox Location = Stygius Gilt. NAME-COLLISION CHECK: this is NOT the `blackstone-fortress` record, which is the Precipice-adjacent fortress of the Blackstone Fortress novels. Different object, different setting, different books.
classhigh
wh40k.lexicanum.com/wiki/Battle_of_the_Stygius_Gilt the Chaos order of battle is '1 Blackstone Fortress'; the Imperial force boards it by torpedo and fights through its interior. Drawn as a station on the blackstone archetype, matching the existing `blackstone-fortress` record, because that is the object the book puts on the page.
gposlow
inferred: no published geography of any kind. Canon names the Stygius Gilt and never places it — no segmentum, no sector, no bearing, and Lexicanum carries no article for it. Position taken from the generator's rim_xy('stygius-gilt') on the unsurveyed rim (r = 430..455, outside every stylised segmentum polygon) so no membership is implied; `segmentum` is null for the same reason. The coordinate carries no information.
No `systems/stygius-gilt.json` is authored. Canon enumerates nothing about the reach — no star, no world, not even a body count; the only object it names there is the fortress itself. A one-star-one-planet survey would contradict the single thing the sources say.