Sith Order (Darth Matas)

"The Sith have their order and we have ours it is only a matter of time before we find their and put an end to it. We cannot have thousands of Sith in the galaxy or their creation of a larger organization"

- Luke Skywalker to a young Polo Hudorra 15 ABY

The Sith Order or the New Sith as they were called by the Jedi, was an organization created on 10 ABY by an unknown human Dark Adept from the Galactic Empire in Darth Sidious' Empire. The founder of the Order created a new order where there is one order with many Sith. The Sith remained hidden from the galaxy during the Galactic Civil War and for most of the Yuuzhan Vong invasion. On 67 ABY, the Sith Order would join the Imperial Remnant to become the Sith Empire.

Founding
The founder of the Sith Order was a Dark Adept left from Palpatine's reign as Dark Lord of the Sith and Emperor. The human Dark Adept found a Sith Holocron where he learned how to become a Sith and about the Sith ways. He had always been trained to use the Dark Side as Palpatine had taught him to control the force to an extent. The human traveled to the planet Korriban after learning of the Sith Holocron. There, he found many holocrons and learned from them. After training himself as the ancient Sith Lords had, years later he proclaimed himself as a Sith Lord. He then traveled to certain places in the galaxy and began to train many force sensitive beings as Sith at once. He did not follow the Rule of Two that the ancient Sith Lords had established as he saw too many flaws in it. The Human decided to create a new rule, a Rule of One, one being the Order with many Sith.

Training of Sith
The Sith began to grow in numbers and now there were many Sith Apprentices. It was said that they would be the future of the Sith. To ensure the growth and strength of the Sith, many Sith were sent to distant planets to kidnap younglings and train them as Sith. The younglings were taught to only know the Dark Side but also Apprentices were trained differently. They were taught to not become like the Sith of Old and betray your master or other Sith. It is unknown if many Sith accepted the new teachings but what was known is that by the end of the Galactic Civil War, there were more than 200 Sith in the Galaxy.

Yuuzhan Vong War
During the Vong War, the Sith still had not really presented themselves to the galaxy. Grandmaster Jedi Luke Skywalker and other high ranking Jedi knew of the Sith's presence but even some still thought there were only two since they did not know of the Rule of One yet.