The group of six Sith Lords known as the Dread Masters journeyed aboard a dreadnaught throughout the Great Galactic War that pitted the Galactic Republic against the reconstituted Sith Empire. The Harrower-class dreadnought transported the Dread Masters from one conflict to another, and these Sith utilized both Sith magic and battle meditation to inspire intense terror within the crews of opposing ships. In 3668 BBY, Jedi Knight Jaric Kaedan managed to acquire the security access codes for the heavily defended vessel. Subsequently, together with a Special Forces team, they boarded the dreadnaught using a stolen yacht and successfully captured the Dread Masters. Having obtained the data from the ship's systems and activated the self-destruct mechanism, the strike team evacuated the dreadnaught along with their prisoners. The destruction of the ship led the Empire to assume that the Dread Masters had died, however, they were actually incarcerated on Belsavis; the Empire then retaliated by attacking Alderaan in 3667 BBY.