Talasa Prime

Talasa Prime is an Ultramar fortress-world gifted to the Deathwatch, and it is their chief training hall and Ordo Xenos keep. Kill-teams from Ultramarines, Scythes of the Emperor, and Lamenters have long staged here against Tyranids. The Great Rift starved it of Nihilus recruits, so other watch-fortresses now share the load.