A technology that reconstitutes the matter of a rock, reforging its atomic links to reduce its volume by 200, which results in nara.[1] Practically, it was used to recycle excess excavated or discarded rock.

In 4826, a "non paying" member of the Guild of Stone Masons headed the effort to devise early fusion-compounding technology.[2]

At the time of the Fall of D'ni the compounder was a small and squat machine with a deep, wedge-shaped metal tray on top and a mesh cage on its underside.

A button on its face made a metal lid slide across over the tray to receive rock fragments. After a low, grinding sound, the nara is molded into a storable form, a bulky red cylindrical jacket. The lid slides back and the cylinder falls in the cage.[3]