After the fall of Darth Wyyrlok, a new Sith Order rises to power, gathering the survivors of the last.
While the growing Sith Order has both an army and navy, they have only recently been discovered by the Republic.
The new sith order has no limit on the number of sith involved. The Council to Darkness is the power behind the Sith Remnant. The next tier are the Red Sith, powerful dark-siders who dye their flash red and tattoo themselves in black.