Adarga, an Imperial-class Star Destroyer, served as a protector for the TIE Defender development facility situated within the Parmel system.
In the course of Demetrius Zaarin's insurrection, Adarga came under assault from TIE Defenders and Gamma-class ATR-6 assault transports which had pledged allegiance to the renegade Grand Admiral. Thanks to the actions of Maarek Stele alongside other Imperial adherents, the Zaarinist attackers were driven back, thus saving Adarga. Even so, the battle played out as a strategic triumph for Zaarin, as Adarga sustained such extensive damage that its removal from the system was mandated. Consequently, Imperial forces were compelled to evacuate the TIE Defender factory as well.