Arc Hammer

The Arc Hammer is a modified Imperial-class Star Destroyer that was used by General Rom Mohc to produce the prototypes of the highly advanced Dark Trooper battle droid.

The Arc Hammer looks like a standard Imperial Star Destroyer with the exception of no bridge tower and that there were two large towers on the dorsal hull. These towers are the factories where the Dark Troopers were produced. It has literally no weapons, and made continous hyperspace jumps so that only a fair few, including Darth Vader's Executor, knew where the Arc Hammer was.

When Mon Mothma assigned Rebel Alliance agent Kyle Katarn to destroy the Arc Hammer, where the Dark Troopers were being produced, he planted powerful explosives around the ship, and the ship consequently exploded.