The Relentless functioned as a transport for Darth Krayt; it was a Sith Imperial starship.
This starship's design mirrored that of the Sith Fury-class starfighter, showcasing a central hull with a pair of wings that stretched outwards. A hangar, capable of housing at least a single Nune-class shuttle, and an observation deck were included as part of the vessel's features.
Darth Krayt utilized this vessel to move himself and a group consisting of Sith Lords – specifically, Lords Wyyrlok, Maladi, Stryfe, and Talon – to Had Abbadon to meeting with the dead Sith Lord Karness Muur. The ship remained positioned in Had Abbadon's orbit while the events transpired on the planet's surface. At that time, Rokure, an Imperial Navy Captain, held the position of commanding officer of the Relentless.