Plesioth

Description

This massive Piscine Wyvern is mainly seen around bodies of water.
Though once capable of flight, its wings have adapted to aquatic
locomotion, for which it relies on sound rather than sight.

Although aquatic in appearance, this monster breathes with lungs
and is active on land. However, disdain for dryness and difficulty
walking on two legs mean it will not stay on land for long.

While it normally preys upon aquatic creatures while swimming,
it is also known to attack Rhenoplos and other monsters on land
with jets of compressed water. It apparently loves to eat frogs.