Star Wars: A Call to Arms
A doomsday cult dedicated to the ancient “True Sith”, especially Exar Kun. They believe that soon there will be a great invasion by the these True Sith from outside the galaxy. and that only the rightous and those that believe will be spared, to serve their new Sith masters.
Understandably they have few actually follwers, though those they do have are fairly dedicated.