This archive tracks four layers. A record present in 1 of them (M41) 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
An eldar craftworld warmed by an unshielded internal sun, which lies in the path of the necron Hyksos Dynasty in Ahriman: Undying and draws the Harlequins of the Masque of the Falling Moon to its defence. What happens to it in that book is kept off this record because it would spoil it; Lexicanum calls its present state unknown.
Position: not recorded — this record has no real-space position in any era.
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
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. 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/Illisar (read directly in a browser on 2026-10-03): 'Illisar was or is an Eldar Craftworld', its internal sun unshielded (Ahriman: Undying chs. 8, 20). https://wh40k.lexicanum.com/wiki/Iyshak: the Masque's Master of Players 'attempted to prevent the destruction of Craftworld Illisar at the hands of the Hyksos Dynasty' (Undying, Prologue, ch. 7). Lexicanum List_of_Craftworlds lists it, citing Ahriman: Undying ch. 8. NAME-COLLISION CHECK: no index record uses the id or label.
offMaphigh
no permitted source gives Illisar a position, a system or a segmentum; a craftworld is under way by definition. offMap rather than an invented point, as for Alaitoc.
archetypehigh
'craftworld', as Alaitoc: an enclosed migratory worldship.
erashigh
m41 only, the era of the book that names it. Its destruction and what follows (Lexicanum Illisar, chs. 8, 20) are spoilers and are kept off the record.