User blog comment:Twilight Despair 5/Fanmade Supernatural Beings/@comment-4554525-20121124020324/@comment-5619706-20121125171649

The Leviathan is actually the serpent of the sea. Behemoth is the beast of the land, and Ziz is the winged monster of the sky. Their trio is not unlike Kyogre, Groudon and Rayquaza, if you're familiar with Pokemon Ruby/Sapphire.

In Biblical lore/mythos, all three beasts are defeated by heavenly powers, and in Jewish tradition, their meat will be served on the celebratory feast for the coming of paradise, if memory serves me right.