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 Leman Russ and the VI Legion
A world of fire and ice whose year swings it from boiling seas to a frozen shell. The Wolves muster here before Prospero, and Fenrisian kaerls raise Solar Auxilia regiments for the Crusade.
Age of the ImperiumM32–M40
imperium
Space Wolves homeworld
Chapter homeworld and recruiting ground, defended by the Fang and by one of the strongest battlefleets outside Sol.
The 41st Millenniumpre-Rift
imperium
Space Wolves homeworld
Feral, lethal and deliberately kept that way; the tribes that survive it are the Chapter's only intake. Assailed directly only a handful of times in ten thousand years.
Era Indomituspost-Rift
imperiumImperium Sanctus
Space Wolves homeworld
Held, and inside the light — but the Wolves now spend most of their strength on the far side of the Rift.
Contested record
Segmentum: genuinely contested, and this record takes the minority side. Lexicanum's infobox says Segmentum Solar and flags its own conflicting sources; Codex: Space Marines 4th and 8th editions say Segmentum Obscurus, Lexicanum's Segmentum Obscurus article lists Fenris among its worlds, and the world's position on GW's official Era Indomitus map falls Obscurus-side of the border once the Segmentum Solar is drawn at its true compact size. This dataset follows the codices plus the map. The real dispute is Solar vs Obscurus — not Ultima — and Fenris is placed on the seam between them rather than committed to the interior of either.
Position
Map frame: 338, 398 in the archive's 0–1000 disk space (core at 500, 500).
Distance from the core: 191 units ≈ 20.4k light years, north-west of the galactic core.
Height above the disk plane: -7.4 units — invented thin-disk jitter, deterministic per record. No published source gives any location a z coordinate.
System: Fenris System
Books set here
15 titles in the reading tracker touch this record, 6 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.
segmentummedium
wh40k.lexicanum.com/wiki/Fenris OBSCURUS, against the Lexicanum majority. Two published readings exist and this record follows the minority one: — infobox Segmentum = Segmentum Solar, itself flagged 'Conflicting sources' — versus Codex: Space Marines 4th and 8th editions, which place Fenris in Segmentum Obscurus, and https://wh40k.lexicanum.com/wiki/Segmentum_Obscurus, which lists Fenris among its worlds. The tiebreaker is positional and is set out in the map-canon entry below
map-canonmedium
official Era Indomitus map (relational): Fenris is drawn well north of the compact Terra hub, in the border territory that falls on the Obscurus side once the Segmentum Solar is drawn at its true published size — about 5% of the disk, not the oversized lobe earlier drafts of this project gave it. A previous version of this record cited the same map as supporting Solar. The map reading did not change; the shape of Solar did, and the earlier corroboration was reading a distorted boundary. Only the relationship was read off the map — no coordinate was transcribed from it
gposmedium
wh40k.lexicanum.com/wiki/Fenris_System derived: — 'sitting near the border of Segmentum Solar and Segmentum Obscurus'. Placed a few units north of the Solar/Obscurus seam in regions.json, deliberately close to it: the dispute IS the border, and a Fenris parked deep inside either segmentum would misrepresent every source on both sides
classhigh
wh40k.lexicanum.com/wiki/Fenris infobox Class = Adeptus Astartes Homeworld / Feral World / Death World; rendered as ice for the world's dominant aspect