The Brotherhood of Darkness was a Sith fighting force during the New Sith Wars. During the war, the Brotherhood fought against and lost to the combined forces of the Galactic Republic and the Jedi Order. The Jedi believed that the Sith had been destroyed at the end of the war for nearly one thousand years, but Darth Bane survived. He founded the hidden Order of the Sith Lords and implemented the Rule of Two.