Premise:
The clone wars are in full swing, however the force has been unbalanced. The Jedi destroyed the sith unknowingly putting the force unbalanced. Now enraged, the Force has chosen an unusual champion, Rey Papaltine who has traveled back in time with her Eternal Empire to reconquer the worlds belonging to the Resurgent Sith Empire, and restore balance to the force.
Now known as the Eternal Empress, Rey has decided to not bring the full might of her empire, rather she decides to deploy expeditionary forces. Led by Darth Nox, Darth Imperius, Darth Oculus, Darth Merciless, Darth Vendactor, and Darth Noxious . Each led a legion of elite Dark Legionaries which are elite soldiers modified by genetics and dark side alchemy they are loyal with question to their chosen sith lord, and are superior to Republic Clone troopers and Separatist Battle Droids.
Darth Oculus and Darth Imperius, arrived first and using Darth Oculus extensive network of sleeper agents and Imperius diplomatic skills they manage to rally abandon Republic and Separatist worlds as well as neutral worlds to the cause of the Sith.