Similar to large earthworms, psurlons had long pink tubular bodies with two arms and two legs that were also long and tubular in shape, ending in sharp claws. Their entire bodies were marked with faint rings. In the place of a head, the creature's body ended in a circular maw filled with harp teeth, surrounded by equally spaced visual organs capable of darkvision.

Psurlons typically wore no clothes, except for belts that served utilitarian or decorative purposes, such as carrying items

Psurlons originally inhabited a world in the Prime Material plane, where they first developed their psionic abilities to such a level of skill that it made it possible for them to change their own shapes. These initial experiments originated the first giant psurlons, while other transformed psurlons ended up destroying their original homeworld, forcing the survivors to flee into the Astral Plane.