Resh held the rank of Grand Moff within the Sith Empire, which had been reconstituted, throughout the Galactic War against the Galactic Republic. In order to infiltrate the Imperial space station called Korriban's Flame in search of the Jedi Jomar Chul, the Jedi Knight known as the Hero of Tython had Lord Scourge, a former Emperor's Wrath and ally of the Hero, transmit Resh's security clearance. This action successfully misled the crew of the station, leading them to assume that the group's Defender-class light corvette was affiliated with the Grand Moff.
The initial reference to Grand Moff Resh occurred during the Jedi Knight quest titled "Fallen" in Star Wars: The Old Republic, a video game launched in 2011 through the collaboration of BioWare and LucasArts.