Kotar Siith

The Order of the Kotar Siith were an order of force sensitives who practiced the dark side of the Force. They were founded by a rogue sith in 2100 ABY and were eventually defeated by the New Jedi Order in 2270 ABY.

Beginnings
The Kotar Siith began when a Sith Lord, whose name is unknown, discovered a network of ancient Sith catacombs. The Sith thought to show his apprentice, but decided against it. He entered the catacombs, and found a wall with many rock carvings. By touching the wall, however, the Sith Lord triggered a trap which shot bolts of electricity. The Sith died. His apprentice discovered the catacombs some time later, while searching for his master, and disabled the traps. After doing so, he explored the rest of the catacombs. They contained many teachings and prophecies written by the predecessors of the Sith Order. The apprentice, named Darth Myranta, decided to form an order to study these writings, as he realized that any group that learned the secrets of the catacomb scrolls could conquer the galaxy.

Followers
Darth Myranta recruited 6 others into his order. He gave each of them, including himself the title of "Darkmask Councilor", saying that the order should cover and "mask" the light of the Force.