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
Homeworld of Vulkan and the XVIII Legion
A volcanic world locked with its oversized moon Prometheus, torn apart every fifteen years when the two draw close. Vulkan's body was carried home to it after Isstvan.
Age of the ImperiumM32–M40
[RECORD LOST]
No record for this location in Age of the Imperium.
The 41st Millenniumpre-Rift
imperium
Salamanders homeworld
Seven cities, endless forges, and a population that shelters underground for the Time of Trial. The Chapter's fortress-monastery is on Prometheus, not the planet.
Era Indomituspost-Rift
imperiumImperium Sanctus
Salamanders homeworld
Held, and still hammering out weapons for a war that now runs on both sides of the Rift.
Position
Map frame: 628, 700 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 237 units ≈ 25.3k light years, south-east of the galactic core.
Height above the disk plane: 1.6 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
wh40k.lexicanum.com/wiki/Nocturne infobox Class = Adeptus Astartes Homeworld / Death World; "vast chains of volcanoes and frequent earthquakes", life given "a dark obsidian-like appearance", the ash deserts of the Scorian Plane and Pyre Desert, the lava pits of Mount Deathfire. RENDERED forge, NOT death (2026-09-01): the canon tag "Death World" is a hostility category, while this dataset's death palette is specifically a green jungle. This record's own provenance already said "a volcanic world" and it was classed death anyway — the infobox tag was read instead of the description
gposlow
derived: Ultima Segmentum, placed south-east of Catachan per the relative ordering of the two on Lexicanum's Ultima segmentum map; no published bearing exists