Gamedeus

Gemdeus (ゲムデウズ) is the thirteenth and final boss Bugster of Kamen Rider Chronicle, which will be supposedly be faced by the Ride-Player once they defeat all twelve Bugsters before it, claiming their Gashatrophies as proof. Not much is known about it at this time.

Foreshadowing
Overheard by Emu Hojo, the presence of a final boss in Kamen Rider Chronicle was revealed by Poppy Pipopapo while she acted as navigator to the human Ride-Players, promoting it as the last opponent to be faced once the twelve familiar Bugsters are all defeated.

Entrusted to beat Kamen Rider Chronicle by Emu, Nico Saiba realized that she would have to defeat Parad before facing the final boss, encouraging Taiga Hanaya to accompany her in confronting him.

According to Kuroto Dan, Gemdeus is the ultimate Bugster, transcending the power of any and all games. The only way to defeat Gemdeus is to obtain the power of Kamen Rider Cronus.

Appearances

 * Icon-exaid.png Kamen Rider Ex-Aid
 * Episode 25: Start the New Game!
 * Episode 30: Strongest VS Strongest!