Sith An ancient cult that uses the Dark Side of the Force. Masters of alchemy and illusion. Once they "were mighty Jedi of the (old)Republic, brothers in the Force, but the Great Schism between the Dark Side and the Light turned Jedi against Jedi." Driven off, exiled, they fled to the far side of the galaxy where they found the Sith people who treated them as gods. After many centuries the Sith empire grew to a vast, rich realm. That was the Golden Age of the Sith . . . until Naga Sadow tried to conquer the Republic and add it to the Sith empire. Sadows invasion was defeated, but at great cost to both sides, and the Sith empire fell into disarray and all but vanished . . . until Exar Kun rediscovered it. Not all dark side Force users are Sith followers; the Force is omnipresent while the Sith are only one following of the dark side, albeit the most powerful and well known.
Dark Lord of the Sith "Traditionally, the titular master of the ancient Sith people. A Jedi who has turned to the dark side of the Force. The title of Dark Lord was passed down from one generation to the next, with only one Dark Lord existing at a time. The mummified remains of the Dark Lords are preserved on Korriban." There can be any number of Sith Lords but only one Dark Lord at a time. Later, Darth Bane instigated the policy of only two Sith Lords at a time, a master and an apprentice.
Darth Title taken by Sith Lords. This tradition was started by Darth Bane, which is why the early Dark Lords did not carry this title. This is also the time when the tradition of one master one apprentice began.
Massassi "An Ancient race of half-civilized warriors on Yavin Four, descended from the Sith followers of Naga Sadow. They were purposefully mutated by Sadow's magic in order to provide a race of fearsome warriors to guard the temples which stand as Sadow's legacy. The Massassi use the dark side of the Force to control and guide their primitive weapons. They were eventually conquered by Exar Kun." Yes, the rebel base on Yavin 4 in SW:ANH was ironically in a Massassi temple, a SITH TEMPLE!
