Sea Serpent

The Sea Serpent was a massive sea-dwelling monster that served Chaos. It was bent on upsetting the order of the oceans.

Overview
It attacked Goblin Slayer and his party in the sea after the party was tipped off by gillmen that it was the true cause for the fish population dropping in the area. While the serpent did some damage to the ship, the party was unharmed as they defeated it by uprooting it from the water with the Water Walk spell (suffocating it), followed by putting an arrow in its brain.

Appearance
The serpent possesses fangs and has the dark sea-bottom’s gold for scales. It's very long and massive, large enough to pose a considerable threat to a ship. It's covered in a slime/ooze which is capable of deflecting arrows.