Gravios is the mature form of Basarios. Easily one of the largest wyverns found in the series, which may intimidate the inexperienced.
Because of its weight, Gravios do not have a tendency to use flying as a method of travel like most other wyverns, instead they will walk from areas to areas, or swim through tunnels hidden under lava. Similar to Basarios, it only uses its wings to get out of trouble, like when the effect of Pitfall Trap has run out or when he has moved too far out of bounds.
Gaps in the Gravios' underside expel a knockout gas, potent enough to put many monsters to sleep, that is produced inside the Gravios' body. It appears to have lost its ability to use poison gasses as it matured. Furthermore, these defense mechanism may be used to deter would-be predators, although there would be few monsters able to penetrate the Gravios's shell. Gravios can also expel flammable gas as a waste product of its 'heat beam', and of its diet.
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 can be found in the Volcano and Swamp. They are able to go in and out of lava without any damage done to them. Gravios eat rocks and minerals for their nutrients.
Other Non-Subspecies Forms
Hard Core (HC) Gravios
What appears to be a older Gravios than usual due to further growth of spikes and muscles. This orange eyed living tank has a improved high speed beam sweep that once charged it is able to sweep across in only 1 second making it both easy to avoid once timed correctly and deadly if evasion is failed. The beam is so strong the Gravios itself almost falls over.
It also has a new charge attack where it steps back while turning towards its intended target to then charge forward by jumping and sliding instantly at high speed finished by slamming the ground.
And a new tail attack where it walks forward then lifts its tail in the air slowly as if charging a attack then swinging it fast and violently causing great damage.
Gravios can put its enemies to Sleep with a gas emitted from pores around its body.
The stomach can be broken twice - the first will reveal the monster's muscle layers, while the second makes the break in its stomach larger. Once this happens, the stomach will receive more damage.
When its legs receive a great deal of damage, it will roll over, dealing damage to whatever it hits. Gravios will also roll over when KO'd.
It can be determined which kind of beam it will do by the sound of its voice. When it is higher pitched, its fire beam will go side to side.
At some time in battles, Gravios may seemingly fly up. However, it should be noted that there is no wind effect as with other monsters, and it will follow up by slamming its body down on the ground, inflicting some medium damage and creating a wide area quake effect.
The fire beam can be blocked using the Guard Increase skill - however, it cannot be completely blocked even when using Guard +2 and Guard Increase simultaneously - the hunter who has blocked the strike will still take damage.
Using Flash Bombs can blind a Gravios for roughly 10-15 seconds.
The red gas that comes after the beam can be predicted, as the Gravios will emit small black smoke around its body.
Gravios' back-plates, legs, wings, and face can broken for the first time.
Its stomach can now be climbed on and attacked.
When low on stamina it will fail to shoot its heat beams, produce gas, and take longer to recover from attacks.