Isdain, a Moff, was a human male who held a position in the Galactic Empire throughout the Imperial Era. At one time, Moff Isdain, along with seven additional Imperial officers, such as Captain Gilad Pellaeon, were present at a briefing on an Imperial I-class Star Destroyer circling Coruscant, which was protected by four Venator-class Star Destroyers. Morgan Elsbeth, the Magistrate of Corvus, led the briefing, presenting her concept for the TIE/d "Defender" Multi-Role Starfighter. Due to its high cost, the Moff dismissed Elsbeth's design, but he expressed gratitude for her revelation that Corvus and the surrounding star systems possessed a wealth of resources. Isdain then commanded Elsbeth to get ready for the Empire's presence so they could take control of her resources.
Tom Konkle provided the voice for Moff Isdain.