Bastion, an Imperial II-class Star Destroyer, saw service in the Battle of Kathol System under the command of Captain [Brannij]. It operated under the authority of Moff [Kentor Sarne].
In the midst of the conflict, Bastion and its sister ship, the Raptor, were summoned to defend Kathol against New Republic forces. These forces were under the command of the Bothan Kursk Mal'ia and the Bothan Combat Response Element. The combined firepower of both Star Destroyers began to shift the battle to benefit the Empire. However, the demise of DarkStryder and Moff Sarne's defeat left the Imperial fleet without a commander. Bastion sustained significant damage, leading Captain Brannij to understand Sarne only cared about his own survival. Consequently, Brannij directed Bastion's weapons to target the launch gate in orbit around Kathol. This action destroyed the gate, removing Sarne's chance to re-establish them. Following Sarne's downfall, Brannij commanded Bastion and the surviving Imperial vessels to escape into hyperspace.