Darth Gean

Darth Gean was a Twi'lek female who was apprenticed to Dark Lord of the Sith Darth Gravid, as part of the Order of the Sith Lords. Around 533 BBY, Gean learned that Gravid, who attempted to blend Jedi doctrines with his Sith teachings, was trying to destroy all the various Sith artifacts, tomes, and holocrons that contained Sith teachings. Gean penetrated the Force shields that Gravid had placed around the bastion that they had built together on the planet Jaguada and was able to kill her Sith Master. Nevertheless, during the fight, Gravid grievously injured Gean, which forced her to wear prosthetics. She eventually took an apprentice of her own, continuing the lineage instituted by Darth Bane.

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