People of any power in this world need to be protected. This game mimics that ideal. The king is the one who has been ordained to take care of his lands and the people within them. No one is more fit and prepared than the king. Therefore, if the kingdom is to survive and thrive the king needs to be protected and stay alive. It is your job to make sure this happens. Destroy any threats to the king and the castle. When the castle has been breached you need to repair it. You have to change armor for the task you need to complete.