In order to defeat Eviluma, Mario must use the Spike Mushroom to feed him three Spike Balls. After devouring the spike balls, Eviluma becomes so full, that he falls to the ground. This Mario's chance to ground pound him. After being ground pounded, Eviluma will get back up, up spit out the Spike Balls at Mario, which can damage Mario. Mario must repeat this method three times.