The Sepan were a sapient race of human-like beings who originated from the Sepan system, which shares its name and is located within the Sepan sector of the Slice region found in the Expansion Region.
This species was composed of the inhabitants of Dimok and Ripoblus, the two main planets within that star system.
The Dimok people and the Ripoblus people engaged in the Sepan Civil War, a war that continued on and off for many centuries.