is the generic term for an area of the continuum that is the focus of a campaign. There is no set size or nature for a realm. A GM may define his campaign as containing multiple realms; in which case each realm is a distinctively different area of the campaign. Realms can be based on geography (the deserts of x), attitudes (the realm of religion y), laws of nature (device z works in realms where . . .), or any other type of grouping.