A long time ago in a galaxy far away, it was the era of the Old Republic 3,600 years before the Clone Wars. It was a time of war between the Republic and Sith Empire. Powerful super-weapons were built and armies of Jedi and Sith clashed. Toward the beginning of the war the unthinkable happened, Sith Emperor Vitiate was defeated by the Hero of Tython, Master Ben Quanobi. Yet, this news was soon eclipsed when it was shockingly discovered that the Emperor had sought to destroy the galaxy, expecting to become a demigod, and that he had somehow survived his encounter with the Hero of Tython.
The war halted in a frantic search to find the former emperor. A powerful member of the dark council named Darth Nox soon encountered the Eternal Empire, a powerful third faction that had gone unnoticed during the war, in the Outer Rim of space. After being captured and brought to their capital Zakuul, she soon discovered the Eternal Empire had been built and led in secret by the Sith Emperor, who now went by the name Valkorian. Valkorian was then killed by his son Prince Arcann and Darth Nox was charged with his father's death. Darth Nox was frozen in carbonite as punishment, while the Eternal Empire announced itself to the galactic community.
Over the next five years, Arcann attacked both the Republic and Sith Empire with the full might of the Eternal Empire, overwhelming them with the technological superiority of Zakuul. To maintain control, he began purging the galaxy of Jedi and Sith, forcing the respective orders to go into hiding. While Grandmaster Satele Shan and many other Jedi went into hiding, Battlemaster Ben Quanobi and his sister Master Yodette Quanobi, a Barsen'thor of the Jedi order, continued to maintain what was left of the Jedi resistance force.
Darth Nox was soon freed from the captivity of the Eternal Empire by Lana Beniko, a powerful Sith who had once been the minister of imperial intelligence. Darth Nox then accomplished what no one else could and created a resistance force on Zakuul. In a desperate attempt to survive, the Republic and Empire allied under her authority to defeat the Eternal Empire. The war with the Eternal Empire ended, and Darth Nox became the galaxy's self-proclaimed empress. With the combined forces of the Eternal Empire and remnants of the Sith Empire at her fingertips, Darth Nox began to destroy what was left of the Republic and began purging the Jedi. In a desperate gambit, the Republic sent everything it had left to Zakuul in the hopes of assassinating Darth Nox.