Leviathan

The Leviathan is from the Hebrew people and is mentioned in the Bible. She was created by God on the fifth day of creation. In medieval times she was seen as a demon of envy and faith, or an arch-demon. She was sometimes seen as a symbol of chaos or as a fallen Seraphim. Her name means “the crooked serpent” or “whale.” She was three hundred miles long with eyes glowing like small suns. She hunted and ate a whale every day. Her breath was foul enough to kill and she could expel heat from her mouth that would instantly boil the water. She feared a sea worm called Kilbit that could get caught in her gills. She lived in the Mediterranean Sea before being smited by God. He then salted the body and fed it to His people. The Behemoth is sometimes seen as the male of the same species as Leviathan.

Citations:

Bane, Theresa. Encyclopedia of Beasts and Monsters in Myth, Legend and Folklore. United States, McFarland, Incorporated, Publishers, 2016.