- Space Marine Headquarters building.
- Projects a Control Area around itself, allowing other buildings to be built near it.
- Produces: Artificers, Scouts, Chaplains, the Inquisitor and the Inquisitorial Retinue.
- Contains research to improve the effectiveness of Scout Squads.
- Upgrades the Monastery to a Fortress Monastery
- Fortress Monastery allows the production of the most advanced units, buildings, and abilities available to the Space Marines.
- Upgrades the Stronghold to a Monastery.
- Monastery allows the production of more advanced units and abilities, like vehicles and Commander abilities.