This archive tracks four layers. A record present in 4 of them (HH, AoI, M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
imperium
Homeworld of Mortarion and the XIV Legion
A world where the air kills at altitude and the human settlements cling to the valley floors, ruled from the peaks by warlords who could breathe it. Mortarion killed all of them and then discovered his father had done the same thing first.
Age of the ImperiumM32–M40
none
Destroyed
The Legion that came from it did not keep it.
The 41st Millenniumpre-Rift
none
[RECORD LOST]
[RECORD LOST]
nothing reliable is published about Barbarus in the millennia after the Heresy. What the previous era states is carried forward, because nothing published takes it back.
Era Indomituspost-Rift
none
[RECORD LOST]
Still nothing. Mortarion has a world again — the Plague Planet, inside the warp, built to look like this one — which is as close to a homeworld as the XIV Legion is going to get.
Position
Map frame: 262, 655 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 284 units ≈ 30.2k light years, south-west 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: Barbarus System
Books set here
1 title in the reading tracker touches this record. Titles link out to the tracker.
wh40k.lexicanum.com/wiki/Barbarus infobox Class = 'Destroyed, former Feral World / Death World'. The Destroyed half is the aoi and m41 status; `death` is the baseline for the poisoned world Mortarion grew up under
era-m41-statushigh
the m41 status was '[RECORD LOST]' alone, and that made Barbarus come back to life. The renderer derives its grey from the aoi status 'Destroyed', has nothing to derive from in m41, and falls back to the survey class — so a world stated as destroyed rendered as a live bile-green death world in the era after. A record getting thinner is not a world getting better, and the status now says so
gposlow
derived: Segmentum Tempestus, placed on the segmentum's coreward-west side near Krieg. No published bearing exists
era-indomitushigh
this entry exists to close a rendering gap, not because a new source appeared. app/src/stages/system.js draws a planet in every era whether or not its record carries that era, and derives a destroyed world's grey from eras[era].status — so an era key the record does not carry falls back to the survey class and the world comes back to life in it. With the baseline moved to this world's LIVING appearance, a missing indomitus key would have done exactly that. The status carries forward what the preceding era already states, on the same source; nothing new is claimed