Birug was High Kappin of the Darrat horde. He was tall and mottled white and brown. He and the other rats in his horde caught prisoners to fatten up and eat. He captured five travelers and brought them to be Burcha Glugg (good food in Darrat tongue), but the travelers escaped. He was sent after them with a patrol, but the chase failed, and Birug himself was killed in a landslide.