Callerail

The terrors of the Plains of Kataru, callerails are large creatures that fuse inorganic and organic material. Flesh mingles with wood, steel, and stone, as the callerail possess the ability to absorb inorganic matter and adds the material to its body. The creature is a lumbering giant - 15 ft. tall - that walks using its forelimbs as well as its shorter rear legs. Its body is a conglomeration of materials.
A callerail's organic portions remain cohesive so that its circulatory system reaches all areas of its body. It still requires food - in fact, it requires even more food than an ordinary creature of its size. Callerails aren't particularly bright and act on animal instinct in most situations. they reproduce asexually.
Reasoning with a hungry callerail is impossible, and they're always hungry.