Dethbrush was a male fox soldier in Ferahgo the Assassin's army, the Corpsemakers. Along with a group of tracker rats, he was sent to follow Dingeye and Thura, who had deserted them. Upon locating Dingeye, Dethbrush decapitated the stoat and took the sword of Martin the Warrior from him, which he had previously stolen from Redwall Abbey.
Upon hearing this, Samkim tracked the fox down and fought with him in the Great Inland Lake. But before Samkim could defeat Dethbrush, the fox was dragged into the lake and killed by the Deepcoiler.