The khargra first appeared in the original first edition Fiend Folio (1981).
The khargra appeared in the second edition in the Monstrous Compendium Fiend Folio Appendix (1992). The khargra appeared in second edition for the Planescape setting in Planescape Monstrous Compendium Appendix III (1998).
The khargra is a creature from the Elemental Plane of Earth, which is usually only encountered on the Material plane when usually searching for a vein of high-grade ore, which it digests as food. A khargra moves through layers of rock as a fish swimming through water. When it locates a vein of ore, it settles to feed and ingest the material.
A khargra appears as a 4-foot tall cylindrical creature weighing about 300 pounds. Its body is covered in large metallic scales. Three large flexible metal fins are spaced evenly around its body. Between the fins, equally spaced, are three conical sheaths from which emerge its extendible claws. Two small eyes protrude from either side of the topmost fin. Its circular mouth is about 1-foot in diameter and lined with curved metal teeth that open and close as an iris does.