"Though all of the_Derriphan-class battleships were thought to be destroyed in the Great Hyperspace War, at least one survived. The ship, belonging to Naga Sadow, was buried on Yavin 4._During the Great Sith War, Exar Kun would raise the ship from the planet and put it back to service, similar to the way Darth Nihilus would raise the_Ravager_from the ruined surface of Malachor V."
-- Knights of the Old Republic Campaign Guide, Page 163