Couatls are radiant, winged serpents, born from the blood of Siberys. When Khyber's fiendish spawn overran Eberron, the coualt fled and hid for a million years. Eventually, they were contacted by the dragons, and together declared war on the demons. As the dragons fought, the couatls sacrificed themselves to bind the 40 greatest demons- the dark lords who would eventualy become known as the Lord of Dust- and imprison them beneath Eberron. Couatls are now virtually unknown, and are presumed extinct.