Darth Nihl's Sith Empire

Darth Nihl's Sith Empire was founded by Dark Lord of the Sith, Darth Nihl and his followers of the One Sith, as a dark side organization in direct opposition to the Galactic Federation of Free Alliances and the New Jedi Order.

The founding
After the end Second Imperial Civil War and the death of Darth Krayt, Darth Nihl and the surviving sith retreated into Korriban where the remaining sith would hide until they would plan revenge against the Galactic Alliance, the Fel Empire, and the New Jedi Order. Darth Nihl decided that it was time to gather new followers to serve him in his new Empire which would take ten years for it to be organized. He ordered the remaining sith to travel to any planet that stood against the Alliance.

A year later, Darth Nihl entered the Exar Kun's tomb, constructed a century ago when Kun's spirit was released, but sent back to Chaos. While meditating, Darth Nihl received a vision of the past of what truly happened during the time of the Old Republic. Seeing the wars and the sith, trying to rule the galaxy, Darth Nihl decided to make it just like what happened in the past. He then saw another vision in the future where he stands across a number of bodies where he rules the galaxy.