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
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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.