Lagiacrus Ecology

Disclaimer:: This is merely a plausible explanation for the monster(s) in this article, and should not be considered canon.

Taxonomy
There is a possibility of this creature being distantly related to crocodilians.

Ecological Niche
Top predator of its habitat.

Biological Adaptations
Ragiakurusu is a blue Sea Serpent that mostly dwells in the sea/deep bodies of water and comes onto beaches to sunbathe. They have hood-like crests on their necks similar to the hoods of real-life Cobras to aid in sunbathing and to allow them to control whether or not they want to float on the surface or sink to bottom and rest. They also have a crocodile-like gait that differs from Fatalis' gait (which is bipedal) and the dermal spikes on its back glow white when it is in rage mode, suggesting that it has an organ similar to the Electro Sac of a Khezu beneath each spike to generate electricity.

When a Ragiakurusu is fully sunbathed it turns a dry grayish blue color and its dermal spikes turn a pale red, but when it returns to the water it regains its striking deep blue coloration and its spikes return to their original color of a very light beige. Also the color pattern of a Ragiakurusu is similar to that of a Great White Shark, Blue on top so prey from above won't see it coming and whitish on the bottom which mimics the sun hitting the surface so prey from below won't see it coming.

Behavior
If food such as smaller sea serpents or fast moving fish is too quick for this massive predator to catch, it will cast out electricity to incapacitate its prey. However, it can also catch prey in a crocodilian fashion. Lying in wait for prey such as an Aptonoth, Jagii, Jagiinosu, Dosujagii, or Kurupekko to come and take a drink or a swim and then strike, clamping down with tremendous jaw pressure, crippling and sometimes killing its prey on impact.