After saving Phantom you will need to completely wipe out the curse for good so everyone combines their collective experience and strength and turn into a new and improved Arcane Golem. You will then need to mash the "A" or "Space bar" to build up your energy to fire off a Kamehameha which proves to be too weak so you need to mash again to blast through the curse's Kamehameha and destroy it for good. You can't lose or mess this up, so mash away.