The vessel was shaped similarly to the Sith Fury-class starfighter, with two wings extending from the central hull. The vessel had an observation deck and a hangar big enough for at least one Nune-class shuttle.
The vessel was used to transport Darth Krayt and an entourage of Sith Lords - Lords Wyyrlok, Maladi, Stryfe and Talon - to Had Abbadon for a meeting with the deceased Sith Lord Karness Muur. It stayed in orbit of Had Abbadon while the events unfolded below. By this time, the Relentless commanding officer was Rokure, an Imperial Navy Captain.
- Legacy 30: Vector, Part 11 (First appearance)
- Legacy 31: Vector, Part 12 (First identified as Sith Imperial ship Relentless)