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
imperium
Ultramarines Strike Cruiser
A famous Strike Cruiser of the Ultramarines. Detached from the armada bound for the Vortengard Spiral, she carries Chaplain Ortan Cassius's hundred-strong strike force to the agri world Styxia Prime and stays in orbit to give the defenders orbital fire (Catechism of Hate).
Position: Styxia System (Styxia Prime) Ultramarines Strike Cruiser carrying Ortan Cassius's strike force to Styxia Prime and holding orbit to give fire support Cited in Catechism of Hate
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.
identityhigh
wh40k.lexicanum.com/wiki/Fidelis_(Strike_Cruiser ) (read directly in a browser with fetch-page.mjs, 2026-10-05): 'The Fidelis is a famous Strike Cruiser of the Ultramarines Chapter' (White Dwarf 284); 'part of the Ultramarines' armada that was sent to aid the Ork-invaded Vortengard Spiral'; 'tasked with bringing Cassius' strike force to Styxia Prime and stayed in its orbit to provide orbital fire for the Imperium's forces fighting there' (Catechism of Hate chs. 1, 2, 4, 9). In M42 it shelters an Imperial Governor during a Drukhari raid on an unnamed world (Warhammer Community, Heroes of the First Founding), not drawn here. NAME-COLLISION CHECK: Lexicanum Fidelis_(disambiguation) lists a Grey Knights Dreadnought, a city on Viridia and this Strike Cruiser; no index record uses the id or label.
classhigh
type ship, no archetype: the dataset has no strike-cruiser hull family, and the Flesh Tearers' strike cruiser Cretacian Justice carries none either.
positionshigh
m41, the Styxia system: in orbit of Styxia Prime (Lexicanum Fidelis_(Strike_Cruiser), chs. 2, 4, 9).
book-joinhigh
VISITED for Catechism of Hate: she carries the strike force from the armada to Styxia Prime and supports the battle from orbit (chs. 1-9). Where she goes afterwards is kept in SPOILERS.
erashigh
m41 only, with the novella. The M42 Drukhari raid names no world, so no indomitus position is drawn. Allegiance 'imperium'.