Pre Jedi vs Sith
He arrived at Endor and was met by Jobie Wan Kenobi. Expecting a Jedi, he was confused by Jobie's Night Jedi presence, but eventually attacked. Jobie's knowledge of both Light and Dark powers allowed him to fight off Incursionus.
Incursionus later returned to Endor, fighting Jobie once more. This time, he fought with more ferocity, and would have been successful had Jobie not used the Force to call for Night Jedi assistance. He was captured by Diaeta, and taken to a holding cell in the Night Jedi citadel.
He convinced Diaeta to side with him, converting to be fully Dark Sided. Diaeta broke him out of the holding cell, and they escaped deep into the forests of Endor, where they established a Sith Citadel.
Tanek Ara also joined the Sith, as a spy for the Night Jedi, helping them to locate the Sith Citadel. The Night Jedi launched an attack, capturing the Sith citadel, and forcing the Sith into combat. Both Incursionus and Diaeta were captured, but Incursionus escaped during transport.
After hiding for a considerable time, Incursionus re-engaged Jobie in combat.
(Incursionus then left the RP, and Jobie was declared to have won and recaptured Incursionus. He is now kept in Night Jedi secured holding cells.)