Tosen was a male Human Jedi Knight who was exiled form the Jedi Order due to his belief that the Jedi need to study the Dark Side in the hopes of defeating it forever. He eventually settled on Nar Shaddaa and hoped to study the Dark Side their due to a Dark Lord of the Sith scaring the planet many thousands of years previous. Tosen eventually was contacted by Tom Keen to decrypt a Sith Holocron, he the met Tom Keen on Nar Shaddaa later on to give him the decrypted data but once he sensed the Dark Side inside him he ignited his lightsaber to combat Tom but he was pushed off the mega skyscraper and he fell to his death.