Mooneater

Bakunawa is a deity in Philippine mythology that is often represented as a gigantic sea serpent. He is the feared god of darkness, hopelessness and despair. He is believed to be the god of the underworld and is often considered to be the cause of eclipses.
According to the Hiligaynon peoples, he takes the form of a huge greenish-black dragon. Once in a while, he awakes from his slumber at the bottom of the sea, attempting to wrestle cosmic supremacy from Bathala by eating his gold and silver disks. Bakunawa can raise the fury of nature, creating tornadoes, tidal waves, earthquakes and lightning storms with just a mere thought. He, however, because of his unorganized motivation, always loses to some other god or goddess, but he always waits for his time.

The great dragon has a whole layer of eerie, calm, black waters in the Abyss, where he spends most of his time planning for his next attack on the other deities.