the Achilles heel

deep within the mountain's there exist a monastary where monks dedicated to prepareing for the worlds end train and practice everyday but among them there exist a boy who is considered one of the strongest in the monastary he looks no older then 17 and strike's the appearence that would be considered cute,but it seems that he has other plans plans to leave the monastary.in this world of freeflowing magic and destiny what could this mysterious boy get himself into.