Final Fantasy Mystic Quest

Focus Tower is the center of the world and balances the forces of the world. However 4 monsters have taken the 4 elemental crystals (Earth, Water, Fire, Wind) for their own use, and also taken the 4 keys that for doors inside of Focus Tower. With the balance disrupted, disasters befall the world. A young boy by the name of Benjamin finds his home village destroyed. Meeting a mysterious old man while trying to escape from earthquakes, he soon learns that he is the prophesized hero and the only on