Black 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
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Taxonomy
Technically a true wyvern. Black Gravios and its Grey counterpart belong to a category known as "armored wyverns" and although can still lift their weight with their wings, cannot fly for very long. Some theorize the Back Gravios will eventually evolve into a fully terrestrial wyvern, or prehaps semi aquadic, as it spends much of its time "swimming" through magma.

Habitat Range
Black Gravios are known to lurk in both the swamplands and volcanic belt, where caves and ore deposits are easy to find. The extreme difference in local temperature, with the swamp so cold and damp when compared to the volcano, means that Black Gravios is not dependent on extreme Heat.

Ecological Niche
A huge lumbering predator, Black Gravios can easily fight and kill most any creature found in the volcanic zone, save for a few elder dragons. Black Gravios has no natural predators except for the giant Akantor. Black Gravios may hunt Volganos when swimming deep in magma. Also, no Black Basarios have yet been reported, so black Gravios may infact be a very old Gravios.

Biological Adaptations
Black Gravios skin has allowed them to withstand the incredible heat of the magma they swim in. Black Gravios thick shell is so tough, even white sharpness weapons cannot pierce it, especially around the legs and neck. Their tail is thick and club-like, easily knocking lesser creatures and hunters out of the beast's way. Black Gravios retains the creatures shovel face, used to assist the creature in consuming large quantities of volcanic ores. Black Gravios has dark red pores all over its body that will vent a red hot gas, especially after using its lava beam repeatedly. Black Gravios can retreat into the lava even if it's underbelly shell has been knocked, meaning even its bare skin is resilience to the heat of magma.

Behavior
Far more aggressive than it's grey counterpart, Black Gravios will attack on site, starting with either a lava beam or charge. Black Gravios will tail swipe less and use flame gas more than standard Gravios, making it more of a threat to hunters attacking its underbelly. Black Gravios is also far more liberal in it use of lava beams, and will only on rare occasions use its bite attack.