Gravios Ecology

Disclaimer: This is merely a plausible explanation for the monster(s) in this article, and should not be considered canon.

In-Game Information
A large wyvern found in volcanic zones. They have a fire breath attack and the ability to emit a sleeping gas and explosive gas attack when in rage mode. They also have extremely hard scales that deflect most weapon attacks.

Taxonomy
Flying Wyvern. It is commonly, and mistakenly, placed in the unofficial classification of Rock Wyvern, as the Gravios looks far too heavy to lift itself with its wings.

Habitat Range
The Gravios is found in the Swamps and Volcanos of the world.

Ecological Niche
Among the largest of the true wyverns. Gravios out-weighs its brethren, but can still lift its bulk using its wings. Gravios are identified by their sheer size, armoured shells, and their diet of ores and minerals.

Top predator, easily one of the strongest wyverns found in either the swamp or volcanic regions. They feed heavily on volcanic rocks for minerals and ores, which consequently aid the development of their supremely strong shells. Gravios are known to migrate to the Swamps, and considering the concentration of ores found in the cold caves, it can be assumed that they can sustain themselves here, too. The bulk of the Gravios is enough to discourage predation, as is its habits to travel using the lava systems of the Volcano. However, this could lead it to be preyed upon by the similarly large Lavasioth. There have also been sightings of Akantor attacking and killing Gravios.

Biological Adaptations
Thick, durable rock-like body armor shields Gravios from intense volcanic heat. Shovel-like head assists when feeding on hard rocky surfaces and in tunneling. Stout legs support its great weight and a thick, club-like tail helps balance the creature and is useful in self defence. Gaps in the Gravios' underside expel two kinds of gases. The first is a knockout gas, one potent enough to put many monsters to sleep, that is produced inside the Gravios' body. The second is a flammable gas it expels as a waste product of its 'heat beam', and of its diet. Since the Gravios feeds on rocks and minerals, there is the possibility of some combustible minerals will remain in its mouth which will allow it to use its 'heat beam' attack.

Behavior
Relatively docile until provoked, but like most wyverns are fiercely territorial. The Gravios inhabits large areas of the Volcano, where it is sufficiently large enough to incubate and raise its juvenile Basarios. It is surprisingly passive to most other inhabitants of this area, but considering its near-impervious shell, it is probably just not bothered by it. Further, its eggs are large and strong enough to sufficiently discourage attack, whilst the mother wanders in search of nutrition.