Realms are self-contained worlds which exist within the larger universe. They are as numerous as stars in the sky, and appear as such when viewing the sky above the [[Dreaming]]. When a realm is in a state of collapse, especially if that collapse was triggered unnaturally, it may connect to the Dreaming and have [[Dreamwalkers]] summoned from it in order to prevent that collapse from transpiring. Each realm falls into a type category and a status category.

Type Categories: 
  * Living Realms are identified by the presence of World Trees and Planes of Shadow
  * Mundanias are identified by similarities in the layout of their primary planet/planetary system and loosely shared history
  * Wild Realms are identified by ????
  * Whatever the hell Nagada had going on

Status Categories: 
  * [[Modern Realms]] (name pending review) are realms that are presently connected to the Dreaming 
  * [[Disconnected Realms]] are realms that are either no longer or not yet connected to the Dreaming 
  * [[Dead Realms]] are realms that have been destroyed, either naturally or unnaturally. 
       * Additionally, there are three known [[Progenitor Realms]]. While these are all realms which have died, they are categorised separatelybecause of their unique statuses as being the first known instances of their realm type.