- Order: Leviathan
- Suborder: Long Neck Wyvern
- Family: Epioth
The Epioth is described as a marine version of the land dwelling Aptonoth, as both are very low in the food chain. They feed mainly on weeds, water grasses, and algae. They can be fooled easily by Gobul's plant disguise, as that they spend most of their time grazing, leading it to be swallowed in a flash. For this reason, Gobul is the main predator of the Epioth in the Flooded Forest. Gobul isn't the only main predator to Epioth however; Lagiacrus and Ludroth all live in both the ocean and jungle lakes just as Epioth does. Epioth are also counted as prey of the Plesioth . It has even been reported that Rathalos and Azure Rathalos will occasionally swoop out of the sky in an attempt to pluck Epioth out of the water when they're hungry.
Epioth have specialized hides used for their aquatic home, making them perfectly adapted to an aquatic environment. Epioth have finned feet and a fin on their tail, which allows them to swim through water gracefully. When frightened, Epioth can swim at break neck speeds. Like other Leviathans, Epioth have lungs.
Unlike the Aptonoth, Epioth live in small groups rather than large herds. The reason for this is that the water, whether in the sea or jungle river, has abundant hiding places. Epioth are very timid creatures, swimming in a haphazard state when danger such as a Lagiacrus is in the area. They are relatively docile when a hunter is around, but they will defend themselves when a hunter attacks. Occasionally, Epioth are known to sunbath on land.