The Sepan were a sentient species of humanoids native to the eponymous Sepan system, a part of the Sepan sector in the Slice portion of the Expansion Region.
The Sepan were divided between the peoples of Dimok and Ripoblus, the two primary worlds of the system.
The Dimoks and the Ripoblus were involved in the Sepan Civil War, a conflict which lasted intermittently for centuries.
- TIE Fighter Collector's CD-ROM: The Official Strategy Guide