Long ago there was a god that took the form of a large, multi-headed dragon by the name Io. Io was considered the most powerful god in the Astral Sea. His only weakness was his pride. He chose to fight alone, and had no army like the other gods and godesses. Io got himself into a battle against two primordials, and was split into two, creating two lesser gods, called Bahamut and Tiamat. All dragons come from Bahamut and Tiamat. This race became very powerful, and reigned over Terrus for thousands of years.