The Umbra is the spirit world, a shadow or reflection of the real world, in the old World of Darkness role-playing game setting. It is inhabited by spirits, gods, ghosts, and various other supernatural beings. The Umbra can broadly be thought of as all realms that exist beyond the mundane terrestrial existence of Earth. Rather than existing as a single universe, the Umbra embraces many mutually incompatible aspects and versions of reality, forming a multiverse of realms that operate by their own laws. Mages and werewolves refer to this multiverse as the Tellurian, and are the two populations most likely to travel to the Umbra. Other beings, such as wraiths, are permanent inhabitants and have considerable difficulty interacting with the day-to-day reality of Earth (hereafter simply referred