Bi Xiao was a minor character in the classic Ming Dynasty novel 'Fengshen Yanyi'. Bi Xiao was one of the three Firmament Sisters; and sister to the famed general Zhao Gongming; who fought on the side of the Shang army against the Zhou army. The three sisters lived on Three Fairy Island as hermits; and joined their brother in the war. They were eventually killed by Yuanshi Tianzun himself; the Heavenly Primogenitor and Grand Master of Taoism.