Knight Errant

Knight Errant by John Jackson Miller
Decades before the rise of Darth Bane, the galaxy is divided between the Old Republic and a resurgent Sith Empire. When a young Jedi is stranded deep behind enemy lines, she strikes out alone against a cabal of bizarrely idiosyncratic feuding Sith Lords who collectively guard a surprising secret.

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This is an Old Republic era book from the Legends timeline. It may be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe)