Gesen was a Human male Sith Inquisitor who served the Sith Empire on the Sith planet of Korriban. During the Cold War, he could be found inside the Tomb of Ajunta Pall. He was studying a dead K'lor'slug while helping guard the one of the entrances. He helped the soon to be sith inquisitors train in the dark force arts.
- Star Wars: The Old Republic (First appearance)
- Star Wars: The Old Republic Explorer's Guide (Indirect mention only)