Prince Biast kin Stagthorne is the son of the present hallow king of the Weald at the time of The Hallowed Hunt. He became heir presumptive on the death of his older brother Byza three years earlier; prior to that he had been expected to have a military career. He is styled prince-marshal and is gaining military experience on the northwest border of the Weald. Biast has a younger brother Boleso who was plotting against him, and a sister Fara who is the wife of Earl Wencel kin Horseriver. Biast's bannerman is his cousin Symark kin Stagthorne.
Prince Biast has brown hair and the long jaw of the Stagthornes. He is a little shorter and of lighter build than his brother Boleso, and is athletic.