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 in this era: [RECORD LOST].
Age of the ImperiumM32–M40
[RECORD LOST]
No record for this location in Age of the Imperium.
Position in this era: [RECORD LOST].
The 41st Millenniumpre-Rift
chaos
Corrupted missionary ship
An Imperial missionary ship turned to Chaos. The Grey Knights Purifiers, sent to the Dierna System by a portent of their Prognosticars, board the Sacrum Finem to hunt it and destroy it before it can threaten the system's people.
Position: Dierna System (Dierna Primus) Corrupted missionary ship, destroyed by the Purifiers before it can threaten the system Cited in Warden of the Blade
Era Indomituspost-Rift
[RECORD LOST]
No record for this location in Era Indomitus.
Position in this era: [RECORD LOST].
Position
A mobile record: it carries a position timeline rather than a fixed point. The archive places it in 1 of the four eras (M41); each era section above carries that era's entry.
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.
identitymedium
wh40k.lexicanum.com/wiki/Dierna_System No Lexicanum page of her own (Envoy_of_Discipline does not exist, checked 2026-10-03). Named on three pages that cite Warden of the Blade, read directly in a browser on 2026-10-03: ('they were able to destroy the corrupted missionary ship Envoy of Discipline before it could threaten the inhabitants of the system', chs. 3, 5), https://wh40k.lexicanum.com/wiki/Sacrum_Finem ('the purging of the corrupted relic-ship Envoy of Discipline') and https://wh40k.lexicanum.com/wiki/Garran_Crowe ('the Missionary Ship Envoy of Discipline', ch. 2). NAME-COLLISION CHECK: no index record uses the id or label.
book-joinmedium
VISITED for Warden of the Blade: the Purifiers purge the ship in chapters 3-5 (Lexicanum Dierna_System, Sacrum_Finem). What she carried is the novel's inciting secret and is kept to the catalogue SPOILERS field.
positionshigh
m41, the Dierna System (Lexicanum Dierna_System chs. 3, 5).
classmedium
a missionary ship (Lexicanum), 'relic-ship' on Sacrum_Finem; no hull class is published, so no archetype is claimed.
erasmedium
m41 only. Allegiance 'chaos': 'corrupted' on every page that names her.