Darth Ruyn

Lord Ruyn was an aged male Twi'lek Sith in the service of Darth Krayt. He trained by Sith, but his last and best apprentice was was a Twi'lek female that Krayt would name Darth Talon. As her final test, Krayt commanded Talon to kill her master Ruyn, which she did without mercy or hesitation.