Sion's only advantage is his immortality (which the female Exile made him throw away--most fun part of the game
). If it's fem Revan, all she has to do is bat her eyes at him and coo in her best honey-sweet southern accent, "Oh, you big, strong, handsome zombie, would you stop using the Dark Side to keep yourself alive, hmmmmmmm, hun? For me?"
Poof. No more Sion.
Male Revan would listen to Sion's "You cannot defeat me!" spiel, roll his eyes, and proceed to grind his immortal butt into immortal dust.
Chapter 12 of A Soul Adrift
: On the planet Felucia, a young apprentice of the Dark Side thinks back to the beginning of her training as she lies in wait for her prey...
All the Time
: After four years in the Unknown Regions, the Exile returns to the known galaxy to visit an old enemy.
: A master of the Dark Side finds himself about to lose the one thing he cares about--and he will do anything to stop her from endangering herself.