Phalanx

Phalanx is the mobile fortress monastery of the Imperial Fists. Officially the homeworld of the Imperial Fists is Terra but in reality the Phalanx serves that role.

Originally found by Rogal Dorn, it was given as a gift to the Emperor as Dorn was found near the Ice Hives of Inwit. The Emperor then returned the craft to Dorn as he was appointed leader of the Imperial Fists.

Phalanx itself is gigantic, and something of its magnitude has not been seen since the Dark Age of Technology. The size of a small moon, its foredeck could dock a dozen cruisers and its design was like a hive of spires reaching towards the skies. It was such a size that it shone like a star, which was a symbolic representation of the Emperor during the time of the Great Crusade. It is completely mobile and often follows the chapter as it moves throughout the galaxy.

Sources

• The Flight of the Eisenstein by James Swallow