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Given the name "Chalice the Legendary", the Mantis Undead is the best fighter of all the Undead. As such, Hajime Aikawa uses the Undead's form and assumes the identity of "Kamen Rider Chalice" while suppressing his Joker nature. (Technically, the form of the Undead is how the Rider form appears save for an Undead belt (while the Rider has the Chalice Rouzer)), as noted by the Eagle Undead before Kamen Rider Blade sealed him.) Though Leangle unseals the Mantis Undead, he is resealed by the Black Joker.