The massive aquatic serpentine demons were a group of demons seen in Hell, they lived in a massive lake devouring any people they came across.
Appearance
The Sea Serpent demons were massive in size, resembling giant snakes with a set of large jagged teeth and webbed dorsal fins down their necks.
Powers and Abilities
Other than being able to swim and breath underwater, the demons had powerful jaws that could bite a person in two.
History
After Jun Fudo finds herself in Hell and met up with Akira Fudo she came across a massive lake. She noticed the serpents causing mass carnage to those trapped in the waters.