Character design of mine.
Born on the fifth day of Creation, Tiamat was the first female Leviathan. She and her male partner were the beasts of the abyss. The Leviathans soon became chaotic and out of control; they posed a serious threat to the balance of Creation. To prevent the Leviathans from repopulating, the Divine Council led by Michael (Marduk) had her slain. Her flesh was stored in the Heaven where it will be served as food to the righteous souls during the Rapture. Tiamat was bound to the oceans of Purgatory and later became a crown prince of Hell and guardian of the Hellgates.