- Imperial Fists Headquarters building. Generates a large amount of Requisition.
- Produces Units: Techmarines, Siege Marines, the Siege Captain, and Lexandro D'Arquebus.
- Produces Vehicles: Rapier Destroyers, Rhino Transports, the Sabre and the Damocles.
- Contains researches to increase the maximum number of units that can be build.
- Projects a Control Area around itself, allowing other building to be built near it.
- NOTE: Each Siege Control HQ building, supports one (1) Siege Generator.
- Limit of three (3) Siege Controls per deployment.