Stars and their courses
This ancient empire existed for hundreds of years. The dwarfish empire stretched across the entire globe. The conquest was fueled by the creation of the Warforged. The way they ruled was to create a cast system based on race. The Drow were set up as administrators, while the other races were pushed into servitude. The elves especially downtrodden.
Due to the failure to bring about the Cataclysm the Elves were then chosen to take the reins of rule. With their manipulation an alliance of elves and humans toppled the empire and caused a minor upheaval that destroyed many cities.