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.
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.
Basarios charges in a manner similar to Diablos or Monoblos, although it is slower and cannot turn as sharply. It is less aggressive than its adult form, Gravios.
Basarios live in Volcano and Swamp regions, which contain lots of ores for them to consume. They have also been spotted in the Everwood.
Other Non-Subspecies Forms
Hard Core (HC) Basarios
In Monster Hunter Frontier Online Season 9.0, a 'Hard Core' Basarios is introduced. They have a branch in one of the rocks on their back, bright blue eyes and purple stains around their stomach pores.
These unique Basarios can now fire 3 heat-beams in rapid succession, followed by a burst of poison gas; they can roll-over to try to crush the hunter, and emit poison at the same time; they can dig and partly re-emerge to spew a powerful ball of fire; they can also leap at the Hunter. Their normal fire-ball attacks are also now much improved.
These juvenile Gravios are famous for their rock-hard carapaces. They often borrow underground, mimicking rocks and savaging oblivious miners. They are known to emit poison gases and are especially weak against bombs.
Basarios takes 1.1x as much damage when underground.
Basarios, along with Gravios, Bulldrome, Gigginox and its subspecies are the only monsters able to be flipped over on their backs when enough damage is done to either of their legs or by knocking them out with an impact weapon.
When knocked out, just like Gravios, Basarios will be flipped over on its back, where it will flail its wings helplessly, causing the wind effect.
Basarios' tail is the smallest in the Monster Hunter world when cut.
Basarios' chest can be broken once, and once this occurs the area becomes much more vulnerable to damage.
Unlike the Gravios, Basarios has two horns.
Basarios's roar requires HG Earplugs to block.
Its roar when becoming enraged only requires Earplugs.
The Basarios stays in only one area, Area 2 of the Old Volcano and Area 7 of the Old Swamp; it will never leave these two areas.
High-rank or G-rank Basarios uses a higher caliber poison than a regular Basarios, should its stomach be broken. This poison drains health twice as quickly as normal poison would. One can tell when Basarios is using this stronger poison; the cloud will be a darker purple and contain poison bubbles within it.
When encountered in the Everwood it is covered in moss.
Basarios's back can now be broken and mined for ore.
Its stomach can now be climbed on and attacked.
This is only after Basarios's back is broken.
In G-rank, it gains new attacks:
It makes some steps backwards during its tail swipes attack.
It can spit three fireballs in a row from right to left.
It can chain its charge attack into a roll.
This monster is unlocked at Level 28.
Basarios's chest can be wounded, and its tail can be severed.