When Pelias shoots his beam at you, block until it ends. Then, shoot him with a 
spear. Repeat this twice. When Pelias flies around and shoots purple flying 
balls at you, hold [Block]. Wait until the balls circle you, then press [Power 
Block]. When Pelias stands on the ground shooting purple balls, stand near him, 
and keep tapping [Power Block]. You should not take any damage.