KNIGHT : Son of destruction

Grey, an adopted kid dream about Magic, Sword and knights, he was saved by one of them when he was young, now he want to became like them, strong, cool and brave.

One day a red-haired girl, a knight, give him the opportunity to pass the exam of the Windsum and have a chance to became a knight. But who is he ? Who is the son of destruction, a lot of question but not a lot of answers.