here is my 2ed thory on how the keyblades were made. when the frist world was went bey, bey, in it's some ware in that time the keyblades were forge. if they were made so that the haerts of the younglings would be safe. but we do not have any prof of what or how meny there are so there is no true key blade master. and the key blade may not even have any elamentl powers. and they seek strong hearts to use them to the bet of there ability.