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The pieces are there for a much darker story featuring these three.
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Her philosophies and gray view of the world would have new fans and old talking for years to come. Watching her pose as an angel on Meetra Surik's shoulder when she is more of the devil is one of the highlights of Knights of the Old Republic II. Watching whatever protagonist fight Sion would be brutal as pain and rage just fuel him.
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We have seen planets blown up before, but watching Nihilus drain the life out of every living creature would be entirely different. These three would be especially good in the (admittedly unlikely) event that Disney strays into darker territory with the property. As Kreia says, "even a stray thought may draw him." Nihilus is able to drain life from an entire planet. Darth Sion feeds on pain to the point where it makes him unstoppable. Treya is a former Jedi (as many Sith are) that turned to the dark side after a long life as the Jedi's premier historian. These three are arguably the coolest Sith we have seen. The Sith Triumvirate is made up of Darth Treya, Darth Sion, and the especially terrifying Darth Nihilus.
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