10 of the Most Deadly Female Dark Siders in Star Wars

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Lumiya

Lumiya was a Sith but because she was mostly cyborg, she could never achieve overlord status.  She was the one who molded Jacen to be what he was, and could also use force phantoms to make physical manifestations of people.  In short, she could be on one planet, while a phantom of herself was physically on another.  She did this by siphoning the force out of other living beings.  Lumiya used a lightwhip which was basically a bull whip made out of energy.  She almost killed Luke in her second fight with him.