Drefin, a Human of the male persuasion, held the rank of colonel within the Imperial Army. This army belonged to the reconstituted Sith Empire during the era of the Galactic War. During the Quesh war, Drefin was stationed on the planet of Quesh, where he acted as a primary adviser to Moff Dracen.
The character of Colonel Drefin is featured on Quesh in Star Wars: The Old Republic, a video game that was launched in 2011 by BioWare.