Brotherhood of Darkness

The Brotherhood of Darkness, known also as the Dark Army, was a Sith army that rose to power in the last decade of the Republic Dark Age. Founded by Jedi Master–turned–Dark Lord of the Sith Skere Kaan, the Brotherhood was formed out of the fragmented New Sith after slaughtering many of its most powerful lords and sought to destroy the shattered Galactic Republic. The Brotherhood existed under the leadership of the Sith Council, constantly warring with the Jedi Order's Army of Light until the Seventh Battle of Ruusan, where they were deceived into destruction by one of their own, who then replaced the Brotherhood with the Order of the Sith Lords and the Rule of Two.

Text and facts from the “Brotherhood of Darkness/Legends” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.