Edarlein
Two thousand years ago, The Enemy rose in the east of Edarlein. They seemed nigh unstoppable, and even the dragons were afraid of them. To avoid being subjugated or killed, many dragons disguised themselves as mortals, giving birth to heirs with both draconic power and mortal adaptability.
Eventually, the dragons formally went to war against the Enemy, a long and destructive series of battles that left most dragons dead, the Enemy sealed away, and a tenth of the world a wasteland.
In the chaos that followed, the draconic heirs proved themselves more then capable, if sometimes brutal, leaders, who brought order to the world through the founding of great empires. The world has now been more or less at peace for five hundred years. But now it's possible the Enemy may be returning, and the world must be ready...or be destroyed.