Muls are a cross between dwarves and humans, bred for the arena.
Muls are half-dwarves, a cross between a male dwarf and female human. Because of their large bone structures, the pregnancy is hard on both the mother and mul, usually resulting in the child having to be cut from his/her dying mothers body.
A mul is slightly taller than a dwarf, but still shorter than human. They are completely hairless like their dwarven ancestors, and are incredibly muscular. As tough as any dwarf, muls are stronger because of their extra size.