wasabiroots
4. Leviathan
You’ve seen them in a lot of games and it is quite well known as a big serpent like sea creature or just a very big creature that uses a lot of water element attacks. In the early 1890s, scholars found stories that may reference the Leviathan’s battle in the Hebrew scriptures with Yahweh who was the god of ancient kingdoms of Israel and Judah.
In Christianity of the middle ages, Leviathan was used as an image of Satan which is believed to be the visual motif of the Hellmouth itself which is a monstrous animal where the damned would be eaten during the Last Judgement.
But it could also just be a species of a huge extinct whale.