The Swords of Mar

Onea was once a world of peace then the first of the swords was made. The first was made for a great leader who led all the people, the other forged later to defeat the tyrant the first leader became. Generations passed and the swords of Mar were thought of as myth, a myth that followed the last of the great leaders, Mar, into history. Stories died and stories followed, but many believed that the blades had a destiny of their own and it was said they would return. Mar would return with his swords and would unite Onea once more, but who would be Mar? Others would choose to be Mar, with the swords they could control all of Onea, but none would believe the swords would fall to a young one who has yet to reach the age of the sword. Why would the swords choose youth? Why Arilius?