The subteroth was a bipedal non-sentient species native to Makeb.
Subteroths typically lived in deep underground caverns, and hunted using scent and the crest on the back of their head, a hypersensitive organ that picks up the electromagnetic fields of a prey's heartbeat and transmits it directly to their nervous system. When their native planet was invaded by the Hutt Cartel in 3638 BBY, the subsequent mining of Isotope-5 caused ground-quakes that drove the subteroths out of their normal hunting grounds and toward the surface.
In the last stages of the Dread War, several Makeb predators were taken to the Oricon moon where they were used in the defense of the Dread Masters. Among them were the Subteroths who were corrupted and tasked with guarding the Dread Fortress. Two gigantic Subteroths could be found in the Dread Cavern area north of the Dread Fortress.
In the Dread Fortress itself, packs of smaller Subteroths patrolled its corridors and attacked any intruders; however, these creatures were altered in such a way so as to explode when slain.