When facing Melfice the first time, equip the Pirates Ring from the first book and get to five stars. Go to Raul Hills and fight the green lizard enemies. If you are lucky, you will get a Power Seed. Get 50 or more and use them on Ryudo. Fight Melfice and put up your strength. You will be able to hurt him. Once you kill him, he will die but the game will still continue to the next screen where it looks like you lost. It is a good challenge.