The Serdian War was actually what started the game. It is hinted that the war was started because of the death of King Carlos by Emperor Doel. After Carlos's death, Albert was named king and Doel didn't like that idea so they separated into different empires, and the war began.
Part of the WarEdit
It seemed that there were many countries that were under a truce with the Waring countries but that truce was broken after one side obtained the power of the Dragon. Also Seles truce was never confirmed as a truce but the raid on that village definitely broke that truce if there was one.