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
Mobile fortress-monastery of the VII Legion
Dorn's command base for most of the Heresy, stationed over Terra. Damaged in the Solar War, it hid at the edge of the system and came back out of Saturn's rings to hit the traitor fleet from behind.
Position: Sol System (Luna, Mars, Terra, Titan) Stationed over Terra as Rogal Dorn's command base, then at the system edge during the Siege Cited in The Solar War
Age of the ImperiumM32–M40
imperium
Mobile fortress-monastery
By M32 already too large for a single Chapter to crew and decaying; moved out between Terra and Venus during the War of the Beast rather than risk it against the ork attack moons.
Position: Sol System (Luna, Mars, Terra, Titan) Moved between Terra and Venus during the War of the Beast Cited in Throneworld
The 41st Millenniumpre-Rift
imperium
Mobile fortress-monastery
Boarded in Sol in 999.M41 by Iron Warriors and Be'lakor, who meant to turn its guns on the Imperial Palace. It later appeared over Cadia and led the evacuation fleet out.
Position: Sol System (Luna, Mars, Terra, Titan) On station in the Sol System when Shon'tu and Be'lakor board it, 999.M41
Position: Cadian System (Cadia) Over Cadia during the 13th Black Crusade; led the evacuation after the world fell Cited in The Fall of Cadia
Era Indomituspost-Rift
imperiumImperium Sanctus
Mobile fortress-monastery
Standing vigil over Terra on Guilliman's orders, wrapped in repair cradles.
Position: Sol System (Luna, Mars, Terra, Titan) In repair cradles over Terra
Position
A mobile record: it carries a position timeline rather than a fixed point. The archive places it in 4 of the four eras (HH, AoI, M41, IND); each era section above carries that era's entry.
Books set here
6 titles in the reading tracker touch 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.
classhigh
wh40k.lexicanum.com/wiki/Phalanx mobile fortress-monastery of the Imperial Fists; https://wh40k.lexicanum.com/wiki/Sol_System calls it 'the massively powerful Imperial Fists battlestation'
positionshigh
wh40k.lexicanum.com/wiki/Phalanx §History — Terra in M31, between Terra and Venus in M32, Sol then Cadia in 999.M41, Terra in Era Indomitus
archetypehigh
catalogue entry 1, moon-scale cathedral fortress — its own hull family, and the reference tag is this vessel by name