On the dragon boss level shoot the shields on the castle with your arrows.You will hear a bing noise. Go to the platform on your left when it comes close jump on it and stay on it you will get water arrows. Then shoot the to torches with your water arrows. In the middle of the circle there will be lighting arrows. Jump up and get them. If you shhot the dragon he will lose 50% of his health. Now your that much closer to beating him.