Eretandia Series: Book 1 (The Scepter)

Long time had passed since the great war between the dark and light mages occurred. It is also the last time when the very first Eren showed itself. No one seems to know what had actually happened. All they know was that they had won that night. They'd successfully defended the kingdom. But they don't know if they will be able to do it for the second time having their most powerful mage gone with the scepter.