Castle Doran (キャッスルドランKyassuru Doran?) is Kiva's base of operations which is of the Wyvern-like Doran Race (ドラン族Doran Zoku?). Though originally called the Great Wyvern (グレートワイバーンGurēto Waibān?), the Fangires captured it and bonded it to the mold of a castle so it would serve as the base of the Checkmate Four. Wataru eventually became its master through Kivat from his mother Maya. While dormant, it assumes the form of a building to conceal itself in plain sight, invisible to ordinary people. When exposed to moonlight, or when Kiva performs his finishing move or uses the Doran Fuestle, Castle Doran awakens and assumes its true form. Due to its unique abilities of sealing defeated Fangires, Castle Doran is home to the Arm Monsters, who are in now servitude of Wataru while being maintained on the Life Energy of the sealed Fangires that Castle Doran devours. In battle, Castle Doran can use Magic Missiles (マジックミサイルMajikku Misairu?), firing the towers on its castle, and spit out Pod Shoots (ポッドシュートPoddo Shūto?) from its mouth. Castle Doran also possesses the power to transcend time and space, first showing the ability in Kamen Rider Den-O & Kiva: Climax Deka when aiding Kiva, Den-O and Zeronos in the battle against the Nega Den-Liner. Castle Doran can use this very same power in the form of the Time Door, which is rarely used as it would summon or send any person from or into any moment in the past, serving as a bridge between the two timelines of 1986 and 2008.