Moss of the River is one of the Lumateran Guard. He originates from the Lumateran River. He was close to Isaboe and Balthazar and pounded at himself when he heard that Isaboe had been slain in the Forest of Lumatere. In Finnikin of the Rock, he is the first Guard in Pietrodore to encounter Finnikin, Trevanion, Sir Topher, Evanjalin and Froi in the town square, and takes them to meet the rest of the Guard. Moss is very proud of being from the River, and believes that River men are the best fighters in Lumatere. He appears to be tough and strong on the outside, but inside had a gentle, good heart.