Leviathan

The Leviathan was a former starship of the Old Republic that was stolen by Darth Malak and used as the flagship for his new Sith Empire. After Malak betrayed his former master, Revan, he used the Leviathan to fire on his ship, the Endar Spire, as it flew near Taris. After the destruction of the Endar Spire the Leviathan set up a blockade around Taris but Revan was still able to escape in the Ebon Hawk. In anger, Malak ordered that Taris be bombed from orbit by the Leviathan to teach the Galaxy a lesson.

After revealing the threat of the Star Forge to the Galaxy, Malak entrenched himself within the Forge and allowed the Leviathan to wander around destroying Republic Ships, however, when the Forge came under attack during the Rise of Trask Ulgo, the Leviathan flew in to assist, only for it to be destroyed by Republic Ships. Malak was later killed when his precious Star Forge was obliterated.