Arca Jeth sent his students to settle a conflict on Onderon. The Beast Wars occured on Onderon, prompting Jeth to arrive on the planet to help the Republic defeat the armies of the Sith led by Queen Amanoa of Onderon. The Sith captured Arca Jeth and tortured the elderly Jedi Knight. Ulic Qel-Droma led a group of Jedi Knights to free his master and cleasned the planet of the darkness. However, a cult named the Krath were using the dark side of the force for their own purposes and Jeth was a member of the Jedi team sent to defeat the cult. Arca Jeth sacrificed his life to save Ulic Qel-Droma from the Krath War Droids and it later caused Qel-Droma to eventually turn to the dark side.