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 aspiring Sith Inquisitors train in the arts of the dark side.
- Star Wars: The Old Republic (First appearance)
- Star Wars: The Old Republic Explorer's Guide (Indirect mention only)