The Harbinger was an Imperial-class Star Destroyer in Grand Admiral Balanhai Savit's Third Fleet, commanded by Captain Gilad Pellaeon. When Savit was exposed as a traitor who was stealing components from Project Stardust, Pellaeon's Harbinger was the first of his Star Destroyers to turn against him, instead siding with Grand Admiral Thrawn and Commodore Karyn Faro. After Savit was relieved of his duty, Pellaeon and the Harbinger were sent to assist Grand Admiral Thrawn at Lothal.
It was destroyed along with the rest of the 7th Fleet by the Purrgil during the Liberation of Lothal. Pellaeon survived.