Tiamat

In the Babylonian creation epic Enuma Elish, Tiamat and Apsu (fresh water) were the original commingled waters before creation. When the younger gods disturbed the primordial peace, Apsu was killed by Ea. Tiamat, grieving and furious, raised an army of monsters and appointed the demon Kingu as her champion. The young god Marduk challenged her, caught her in a net, drove winds into her open mouth, and split her body in two — one half became the sky, the other the earth.

A vast serpentine dragon of the deep sea, capable of swallowing the universe. She had the ability to give birth to armies of monsters including the Viper, the Dragon, the Sphinx, the Great-Lion, the Mad-Dog, the Man-Scorpion, and the Fish-Man.

As the primordial waters, she was the source of all creation. Could generate new monster species from her body. Her blood became the material of humanity. Even slain, her body constitutes the physical universe — she was not destroyed, but transformed.