urXron is a collective manifestation of space and time, a number of different “realms” that are collectively poised between the Outer Darkness and the Inner Source. The size, conditions, and even the physical laws vary from one realm to the next, without any physical connection. Travel between them is possible, but it is rooted in the very greatest magic. Legends tell of the existence of permanent Gates linking certain Realms, though the locations of any such are unknown.
Each Realm is the creation and demesne of one of the Powers That Be, which he shares with his minions, creations, and bound souls. The exception is the Material Realm, said to be the work of all, and belonging to none.