A daughter of the great Duras house, and sister of Duras himself, she shared in many of her brothers deeds. After Duras's death at the hands of Worf she and her sister, Lursa, conspired with the Romulans in a bid to bring Toral to power as leader of the council. This plunged the Klingon Empire into a civil war, after which she dissapeared for two years. After hiding out, the two sisters returned to the political game, trading minerals for money to increase their military might to make attempts to seize control of the Klingon Empire. The end came when the Enterprise-D stumbled upon their attempts to design trilithium weapons with the help of Dr. Soran. B'Ethor died when the return fire of the Enterprise-D destroyed her class D-12 bird-of-prey.