Diablos are large, bipedal wyverns with powerful armor plating covering much of their body. Their most noteworthy feature is a pair of massive, solid bull-like horns above their red eyes. Diablos also possess a pair of tusk-like fangs and a large, spiny neck frill. Their tail ends with a heavy, studded club that can be used to ward off attackers. Diablos stand on a pair of stocky, wide-set legs and possess a broad upper body complete with thick, muscular wings.