The Dragon Children

One day in 1291, a boy named Naphtali's father gets coronated. That is, until a devil attacks the kingdom. Naphtali fights for his kingdom, before he blacks out. He wakes up in a strange castle with a mysterious figure. This figure acts as his mother for 2 years while his kingdom looks for him. Once they find him, they kill the person that acted as his mother. Now, Naphtali has to take revenge on his own family with a group of mystical beings known as the "Holy Stones".