The amount of floor space a creature requires to fight effectively, expressed as one dimension of a square area (for example, a creature with a space of 10 feet occupies a 10-foot-by-10-foot area on the battle grid). Space determines how many creatures can fight side by side in a corridor, as well as how many creatures can attack a single opponent at once. A creature's space depends upon both its size and its body shape. Sometimes also called fighting space.