The Sheperd's Union is a religious group in Metal Shadow. They purport to practice the teachings of the "Great Shepherd" in a worship known as Shepherdism. Common folk often refer to them as Shepherdists.

Shepherdists are notorious in their distrust of elemancy. The sect in Deep Kuralle is constantly at odds with the Iema Gear Committee, whom they view as harbingers of evil due to their constant manipulation of Iema gears. Since the incident with the Dead South Routers, this sect's popularity has risen dramatically, though whether the incident is solely to attribute for it is unknown.

Lloyde observes that this sect practices Shepherdism very differently from the sects on the outside; where Shepherdists normally try to communicate peacefully and in private, those at Deep Kuralle frequently make public speeches and demands.