Darth Traitos

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"The Emperor was a fool to teach me of his dark weapon. Now unleashed, it will be his end."

—Darth Traitos to his cell guard before escape

Darth Traitos was a Force Barbarian and self-proclaimed Sith Lord. His real name was unknown. He was captured by the Empire and trained as a dark side adept, and possible replacement for Vader should he have died.

[edit] Behind the Story

'Traitos' is just 'Traitor' with an S for an R.