Eberron - Signs and Portents
In the mythic past, the world was one great mass. The progenitor wyrms, the first and the greatest of dragon-kind, ruled all. The three most powerful – Siberys, Eberron, and Khyber – discovered the Prophecy. A world shattering struggle ensued. The battle split the world into three parts. Siberys became the glowing ring that surrounds the world and gave birth to the next generation of dragons. Khyber was bound to the darkest depths and spat out various fiends and demons. However, Ebberon laid amid them, to heal the world and from this sacrifice sprang all manner of living things.