Rogue Sith Order
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The Rogue Sith Order (RSO) was a pre-reset Sith roleplaying group that existed in 2000. It was formed out of a combination of newer Sith roleplayers as well as roleplayers that had defected from The Sith Empire.
Eventually the group, along with The Sith Empire and The Sith Order, combined together to form an alliance known as the Dark Axis. This cooperation together, as well as the somewhat awkward existence of 3 separate Sith groups, ended up resulting in RSO's decline which lead to it's eventual closing. Most of the remaining members ended up joining one of the 2 remaining Sith groups.