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The Arc Hammer was a factory ship of a unique design. Like many other Imperial starships, the Arc Hammer had a long, narrow, dagger-shaped hull; however, it also had four large columns surrounding a central one that protruded from below and a small, flat bridge structure in front of the columns on its dorsal side.
The Arc Hammer served as a primary testbed of the Dark Trooper Project, a brainchild of General Rom Mohc which was to create larger, more powerful robotic versions of stormtroopers. The Dark Troopers were developed inside the vessel. Construction lines filled the interior and four large ventral hangars were responsible for receiving cargo vessels and loading batches of dark troopers into transports or deploying them directly above a target world.