The most ancient legend is the tale of the three progenitor dragons: Khyber, Eberron, and Siberys. Some say that Khyber slew Siberys, only to be bound by Eberron; the three dragons became the world (Eberron), the darkness within (Khyber), and the ring in the sky (Siberys).
Most people are familiar with this legend; most religions commonly accept it, with other deities and powers rising in the age that followed. But few tales explain the reason behind the legend. Some scholars say that Khyber and Siberys learned of a secret tied to the fate of the universe itself, and that they fought to control this power.
No human knows the truth of this legend. But the dragons of Argonnessen are far older than humanity. They are the true children of Siberys, and they have devoted tens of thousands of years to studying the ancient mystery—the Draconic Prophecy.