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Mantis Undead (マンティスアンデッド, Mantisu Andeddo), also known as Chalice (カリス, Karisu), is a Category Ace of Hearts Undead reputed to be the best fighter of all the Undead. Its form is used by Hajime Aikawa to fight as Kamen Rider Chalice while suppressing his Joker instincts.
History[]
The Mantis Undead, also known as "Chalice", was present in the original Battle Fight 10,000 years ago. It was a powerful Undead even among Category Ace who survived until the end of the game, and was known as the "Legendary Undead" due to its strength. The Mantis Undead was said to be comrades and rivals with the Eagle Undead and they promised to survive together until the end to settle their matters.
When the Undead were released in modern times, the Mantis Undead was sealed by Joker off-screen. Since then, Joker would operate as Kamen Rider Chalice using the Mantis Undead's form, even mistaken for the latter Undead on some occasions. Although it was unsealed by Mutsuki Kamijo, who was controlled by Spider at the time, Hajime was able to defeat the Mantis Undead even without using his Joker powers and sealed it again.
20 years after the events of the series, the Caucasus Undead was unsealed and on its way to seal the two Joker Undeads so that it could win the Battle Fight. Caucasus beat Hajime and stole the Change Mantis card from him, which allowed the Mantis Undead to be freed. Mantis was asked to support Caucasus on its quest to hunt down the two Jokers. Mantis agreed, not forgetting to remind the King of Spades that it would come after the latter next.
Mantis was desperate to have Hajime pay back for having used its power for such a long time, but Hajime showed no resolve to fight. Irritated, Mantis tried its hardest to make Hajime succumb to his Joker instincts and do battle with it, but to no avail. Seeing the Joker as not worth beating in such a state, Mantis attempted to go away, but Caucasus refused and tried to subdue and brainwash it. Fending off Caucasus's minions, Mantis was able to escape.
On the way, it located Kazuma Kenzaki - the remaining Joker Undead. Mantis spurred Kenzaki to battle with it, which the latter complied. After a while, Kamen Rider Blade managed to defeat the Undead. Upon being resealed, Mantis conceded defeat and explained how Caucasus had successfully sealed Hajime and was plotting something nefarious. The Change Mantis card would later be returned to Hajime by Kenzaki, allowing the former to transform into Kamen Rider Chalice once more.
Mantis Undead[]

Mantis Undead
- Statistics
- Height: 204 cm
- Weight: 109 kg
As the Joker simply copies other Undead, the Mantis Undead is identical to Kamen Rider Chalice, except with an Undead belt in place of the Chalice Rouzer and card holder. The Mantis Undead wears a suit of armor named the Chalice Veil (カリスベイル, Karisu Beiru).
Though Leangle unseals the Mantis Undead, he is resealed by the Black Joker. Its abilities match those of Kamen Rider Chalice, save for any abilities related to Rouse Cards.
Rouse Card[]

Mantis Undead Rouse Card
- Suit: Heart (♥️)
- Category: Ace (A)
- Effect name: CHANGE
- Card name: Change Mantis (チェンジ・マンティス, Chenji Mantisu)
- Consumption points:
Notes[]

The Mantis Undead's true face on the S.I.C. figure.
- The body of Mantis Undead (and by extension, Kamen Rider Chalice) is concealed by its armor, the Chalice Veil. Its true appearance remains unseen.
- In the Super Imaginative Chogokin line, if the Hearty Glass is removed from Kamen Rider Chalice's mask, a pair of yellow eyes from what is presumably the Mantis Undead's true face can be seen.
Appearances[]
Kamen Rider Blade
- Episode 23: Who are You?(Flashback)
- Episode 35: A Dangerous Transformation!?
- Episode 36: Strongest Form
- Kamen Rider Blade 20th Anniversary STAGE&TALK