This archive tracks four layers. A record present in 2 of them (M41, IND) is silent in the rest, and says so.
The Horus HeresyM30–M31
[RECORD LOST]
No record for this location in The Horus Heresy.
Position: not recorded — this record has no real-space position in any era.
Age of the ImperiumM32–M40
[RECORD LOST]
No record for this location in Age of the Imperium.
Position: not recorded — this record has no real-space position in any era.
The 41st Millenniumpre-Rift
aeldari
Aeldari craftworld
One of the largest and most populous craftworlds, caught in the pull of the Eye of Terror and orbiting it, so close that it fights Chaos raiders in its own halls. Short of Aspect Warriors, it keeps a standing army of Black Guardians and more Warlocks and Farseers than any other craftworld, and its Seer Council meddles in other races' affairs more than any of its kin.
Position: not recorded — this record has no real-space position in any era.
Era Indomituspost-Rift
aeldari
Aeldari craftworld
Still the home of Eldrad Ulthran's Seer Council. Raided by the Dark Eldar of Lelith Hesperax's Cult of Strife, it calls on the Coven of Isha, its secret pact with the Ordo Xenos of Ramugan Station, and a Deathwatch kill-team under Captain Quirion Octavius comes aboard to fight beside the craftworlders (Warrior Coven).
Position: not recorded — this record has no real-space position in any era.
Position
This record has no real-space position and is not placed on the map. The reason is in the provenance below.
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/Ulthw%C3%A9 (read directly in a browser on 2026-10-03): 'one of the largest and most populous Eldar craftworlds remaining since the Fall of the Eldar'; caught in the gravitational pull of the Eye of Terror and now orbiting it; the Black Guardians; the Seer Council formerly led by Eldrad Ulthran. Warrior Coven is cited for its Dark Reapers (ch. 2) and for named places aboard: Calmainoc, Ghreivan's Gate, Khalandhriel's Hall (chs 5-6). NAME-COLLISION CHECK: no index record uses the id, the label or either alias.
book-joinhigh
wh40k.lexicanum.com/wiki/Warrior_Coven_(Novel PRIMARY for Warrior Coven (deathwatch::dw-goto::2): Black Library's description, 'The eldar of Craftworld Ulthwé are under attack by the sinister dark eldar, and it falls to Octavius's warriors to fight alongside the lesser evil of the craftworlders' ()); the Lance of Darkness carries the kill-team to the craftworld (https://wh40k.lexicanum.com/wiki/Lance_of_Darkness, ch. 3 pgs. 212-213); the Raid on Ulthwé by the Cult of Strife (https://wh40k.lexicanum.com/wiki/Cult_of_Strife, ch. 1); the Seer Council named in ch. 1 (https://wh40k.lexicanum.com/wiki/List_of_Ulthw%C3%A9_Aeldari).
offMaphigh
A craftworld is under way by definition, as for Alaitoc. Lexicanum Ulthwé says it 'now orbits' the Eye of Terror, but its infobox gives the Current Location as 'Edge of Ultima Segmentum' (a later source), so the two disagree and neither is a system to dock in. offMap rather than an invented point beside the Eye.
archetypehigh
craftworld, the archetype Alaitoc carries: an enclosed migratory worldship.
erasmedium
m41 from Lexicanum Ulthwé's overview (present-tense M41 canon); indomitus because the shelf files Warrior Coven there (Lexicanum List_of_Media_set_during_the_Era_Indomitus: it follows Warrior Brood, set nearly a century after the Badab War judgement). hh and aoi are left out: nothing this shelf holds is set on it then.