|Type of organization||
The Sith Ascendancy, called the Shadow Empire after its defeat and subsequent withdrawal beyond the Outer Rim and into the Rishi Maze, was a government and military power established by an ancient Sith presence on Dxun known as Tvath.
It was run in the fore by Darth Nevess and his apprentice, Darth Vician, the both of whom answered only to Tvath in the Sith Temple ruin on the Demon Moon.
After Nevess' destruction at the Siege of Maramere by the hand of his own apprentice, Darth Vician became the new Sith Potentate and styled herself publicly as Empress Nerha Rero of the Kzes.
The Ascendancy continued its war against the Tair Republic until Darth Vician's capture by the Mandalorians in 327 ABY and execution (despite Jedi disagreement) in 330 ABY. With her loss, along with the deaths of Darth Aanx in the assault on Illum and Darth Rend in a power dispute with fellow Sith Lord Darth Vehendal, the Ascendancy of the Sith became the Shadow Empire, a fangless serpent and a shell of its former glory. Never fully vanquished, the Shadow Empire shrank back into the Rishi Maze and parts of Wild Space and remained there for decades until, eventually, it had all but disappeared.