Bogan was a word used by the scholars on Tython that first studied the Force. Bogan was the word the scholars used for the dark side of the Force. The light side of the Force was called "Ashla." After years of studying the Force, a war broke out between the Ashla users and the Bogan users. The Ashla users won the war and believed the Bogan users to be extinct. After being defeated, the Bogan users fled to the planet Korriban and grew in secrecy. The Bogan users at that point were a species called Sith. The Sith species were tall Human-like beings with skeletal features. Eventually, the Sith kingdom would be taken over by an exiled Jedi named Leviahs.