The Automatons are a widespread mysterious class of biomechanical beings.
While appearing mechanical, automatons almost rely on the standard elements used by almost all classes of baryonic organism. Their cellular structure is very strongly decentralized, to the point where it's common for some organs to appear to be made of a single continuous cell.
The origins of the Automatons are unknown, it is likely that they were originally created in Aldartha or "evolved" from machines found from the rifts. The latter is supported by them appearing on Rift Worlds all over the galaxy.