The mus are a race of diminutive rodents that resemble bipedal mice. They live in regions normally unvisited by larger humanoids such as forests, isolated valleys, and forgotten ruins, but they are also known to inhabit large cities, where their tiny empires grow powerful beyond the notice of the city's conventional inhabitants. Mus communities are ruled by hereditary sultans, and they create elaborate dwellings, decorated in the fashion of the most luxurious cities.