Mister Must Ambertroshin was the doctor, footman, and carriage driver to Dantoc Calmpositis of Reliant City. He was an old man who had the bearing of a veteran and often had knowledge of obscure and esoteric facts. He claimed to be from Theft and found himself in Reliant City due to what would make a long tale involving his wife and "Oponn's infernal pushings." Mister Must had broad shoulders, a scarred and seamed face, bushy eyebrows, stained teeth, and a wild beard the color of copper and iron. He wore a broad hat, smoked a pipe of rustleaf, and spoke in measured, economic sentences.