Diablos are large, bipedal wyverns with powerful armor plating covering much of their body. Their most noteworthy feature is a pair of massive, solid horns above their 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.
Diablos' chief adaptation is its twin horns. Both are strong and sharp, witnessed phenomenon shows that these horns are strong enough to easily overpower in a physical clash, but they wear constantly. Diablos has blunt claws on its wings, strong neck muscles that allow it to support its bulky head even while charging, and a pair of strong hind legs that help it to burrow through desert sand. Such powerful muscles also make it formidable in combat, and although Diablos cannot launch projectiles from a distance, it more than makes up for it with its extreme speed and devastating blows. Diablos' thick tail serves as a club for self-defense, capable of breaking solid rock. Diablos' shell and spines are perfect for protecting Diablos from any threats it may face.
Despite their herbivorous diet, Diablos are extremely aggressive towards other monsters who venture into their territory. Because their habitat does not permit the growth of many plants, Diablos are always in competition with other monsters and each other over spots in the desert rich in vegetation such as cacti.