Jedi splinter group

A splinter group of the Jedi Order was active prior to around 5000 BBY. Comprised of former Jedi who turned to the dark side of the Force, the splinter group opposed the Order's reverence for the light side of the Force. The group was founded as a sect of the Jedi religion by a rogue Jedi who discovered that raw power could be achieved by devotion to the dark side. The Jedi High Council at the time repudiated the rogue Jedi's claim about unlocking the "true power" of the Force through the dark side, ultimately banishing the renegade from the Order. Nevertheless, his views had a schismatic effect on the Order. The dark Jedi gained a following of fellow outcasts for his new order as a result, and they eventually founded the Sith Order during the Hundred-Year Darkness.