Eighty Day War

The Eighty Day War was a shortlived conflict between the New Jedi Order, and the growing New Sith Order. After the former Sith Apprentice of Darth Caedus, Tahiri Veila, discovered the Sith on Korriban, she informed Matteo Corlaso before she died. Traveling to Korriban, he saw evidence of the Sith, then led a group of Jedi to destroy the Sith. Both groups were utterly destroyed besides Ben Skywalker and Matteo, and as a result, Darth Krayt decided he must destroy the Jedi responsible.

Capturing and assuming the identity of Chief of State G'vli G'Sil, he assassinated Luke Skywalker and killed Matteo in a duel. Manipulating Cha Niathal, he had her kill several prominent Jedi, including Saba Sabatyne and Kenth Hamner. This led to the formation of the Fel Empire, led by Baron Soontir Fel. Jaina, now married to Fel's son Jagged, convinced the Jedi to team up with the new Empire to find what was causing the mysterious deaths. They found Cha Niathal, captured her, and was told G'vli G'sil was behind it. They staged a massive attack on Coruscant, where Ben found Darth Krayt, and dueled him. He seemingly killed him, and the Imperials held the Galactic Alliance, feeling it couldn't rule anymore. The Jedi and the Galactic Alliance, free of Krayt, drove the Imperials, but some Jedi stayed with the Imperials, forming the Imperial Knights.