Na'daz

Na'daz was a Twi'lek Sith Lord near the end of the New Sith Wars. When traveling on Ryloth, he discovered a young Twi'lek slave who was strong in the Force. Na'daz bought the boy and trained him as a Sith on Ryloth. When his apprentice, Kas'im, felt he was ready, he challenged Na'daz to a duel and slew his master. Kas'im took his master's lightsaber, which had a curvd hilt, as a trophy.

Kas'im later went on to become the greatest lightsaber duelist of his time, training many Sith at the Korriban Academy. Finally, Kas'im gave Na'daz's lightsaber to his greatest student: Bane, who presumably used it for the rest of his life.