A Delirium is a type of Plasmic sometimes found in the Tempest in Wraith: The Oblivion. They seem to be a "higher" form of the more common Phantasie. Some Deliriums, at first glace, resemble ordinary, everyday animals; however, closer examination reveals that they possess powers and a physiology that regular animals and Phantasies lack. The difference may be as simple as an animal with extra appendages, such as a cat with wings or a monkey with extra arms. Their altered appearances also extend into animals that are severely deformed and bear terrifying visages.
In spite of their strange appearances, Deliriums have just as wide a range of motivations as the Phantasies; some are benevolent to lost travelers, some will work in exchange for favors, and some exist only to hunt down prey in the Tempest.