The final boss of Kamen Rider Summonride, Gigasutaru (ギガスタル Gigastaru) is the creation of Super Apollo Geist. The player (all Riders) fight him in a special zone, instead of one of the five elemental themed areas of normal missions. The fight begins on floating asteroids, each with an elemental affinity. During the fight, Gigastaru will destroy and absorb each asteroid, gaining that elemental power, and an additional attack.