The ship was used to carry Sith personnel to and from battle fields across the Galaxy. It also acted as a "Mothership" for the Sith Dropships it used as the primary method of landing troops on a Planets surface.
Not only were these vessels responsible moving troops about during the War. They played a direct role in the escape of the Sith, so that they could return as the modern Sith Empire and wreak havoc in the Republic.
In 5,000 BBY, two carriers, Harbinger and Omen, were mining Lignan ore on the moon of Phaegon III when they were attacked by two Jedi, Relin Druur and Drev Hassin. Hassin sacrificed himself by crashing the Jedi's starfighter into Harbingers command bridge, causing the vessel to crash into Omen just as the two ships jumped to hyperspace. This caused the Omen to crash on the planet of Kesh, where the survivors formed the Lost Tribe of Sith, while the Harbinger entered an unstable hyperspace route and traveled through time to the year 41.5 ABY.
- Timeline 11: Resurrection of the Sith Empire (appears in hologram only)
- Timeline 12: The Great Hyperspace War (appears in hologram only)
- Star Wars: Tales of the Jedi — The Fall of the Sith Empire (First appearance)