"They often borrow underground, mimicking rocks and savaging oblivious miners."
Its hard, stone-like shell can be used for protection against other large wyverns, doubling up as effective camouflage when Basarios partially buries itself in the ground. It is able to release either sleeping or poisonous gas from its underside and, on extremely rare occasions, a fire plume. It is also known to unleash a very powerful lava beam at times. It can also hurl balls of fire like a Yian Kut-Ku, although it prefers to charge towards adversaries.
When resting or changing areas, it burrows underground, exposing only its back, giving it the appearance of a large gray rock. Being very heavy, it is a slow mover, and although it has wings, it rarely uses them to fly. Even when it does, its weight allows it to fly only for a short time.
Despite its ability to hide, in most areas it is visible. This is because the rocks on its back are a slightly lighter color than other rocks, or because it has burrowed into plain view in the middle of the area.
Gravios is covered in a dense, stone-like armored shell which protects its body from physical damage. It is very large in size, towering over most other wyverns and measuring several dozen feet in length. Because of its size and incredible weight, it is only capable of limited flight, despite having large and seemingly-developed wings. It has a thick tail with a mace-like club at the end.
Basarios is a small, rocky wyvern. It is the juvenile form of Gravios. Its hard, stone-like shell can be used for protection against other large wyverns, doubling up as effective camouflage when Basarios partially buries itself in the ground.