Kerberos

is the strongest Undead in existence, first appearing in Kamen Rider Blade. Developed by BOARD chairman Hiroshi Tennoji, the Kerberos Undead is an artificial life-form with the combined data of all 53 original Undeads, proving a significant threat for the Kamen Riders. 
==Biography==
Desiring to "re-write" the world, Tennoji sought the powers given by the Monolith, which could only be accessed by an Undead who won the Battle Fight. Thus, he manipulated several people for his own ends, while secretly collecting data from every Undead in existence. 
Once fully prepared, Tennoji ordered his subordinates to create a "fifth" Ace Undead, named Kerberos. Unlike Titan and the Trial Series, Kerberos proved uncontrollable, killing everyone in its vicinity upon being born from the Stone of Sealing. 
Gleefully watching Kerberos' rampage, Tennoji saw to it that his creation defeat all other Undeads in existence, including Hajime Aikawa/Kamen Rider Chalice.
Proving too powerful, Kerberos swiftly defeated Chalice and Leangle, stealing their Rouser cards. Likewise, Garren had his Jack and Queen cards of stolen as well. 
Enraged, Kenzaki fought Kerberos as Blade King Form, but struggled against its swift and brutal attacks. In a smug manner, Tennoji mocked Kenzaki and the others, stating that Kerberos was unstoppable. Refusing to yield, Kenzaki regained his footing, countering with a dual-sword style. Completely outmatched, Kerberos grew helpless against Kenzaki, falling onto the ground in defeat. 
Though genuinely surprised at this predicament, Tennoji sealed the Undead into a Rouse card, leaving the scene afterwards. Using a surgically graft device based on the Rider System technology, Tennoji fused with Kerberos, becoming Kerberos II with Tennoji's face on the monster's chest. Facing Kenzaki's group, Tennoji attempted to defeat them in battle.
Joined by the Giraffa Undead, the four Riders overwhelm Tennoji; the latter's transformation canceled by Blade King Form and Wild Chalice's Double Rider Slash.
Defeated, Tennoji was ultimately killed by the Giraffa Undead, with the Change Kerberos card stolen by the latter. 
Afterwards, Giraffa tried using the card's latent ability against Chalice, but Blade jumped in the way and it absorbed all of the Spade Suit cards instead. In a later battle, he tried stealing Garren's cards the same way, but Garren defeate him before he could do so. Kerberos's card isn't directly seen being retrieved in the collection of cards that floats to shore, but it presumably was done so, given its immense danger. 
==Kamen Rider Blade: Missing Ace==
In an alternate future, the Change Kerberos was used as the Ace card for Kamen Rider Glaive, with two copies of the card used in creating Riders Lance and L'arc. 
==OOO, Den-O, All Riders: Let's Go Kamen Riders==
In an alternate timeline where Shocker conquered the world thanks to the Shocker Greeed, Kerberos represented the Undead in a coalition of the various evil organizations and monster races which were allied with Shocker. With the Giraffa Undead by his side, Kerberos was present at the conference of alliance. 
==Kerberos==
As the "ultimate" Undead, Kerberos is far more powerful than his predecessors, proving physically stronger than the Joker Undead itself. Thus, in their first battle, Kerberos initially threatened even Blade in King Form, bypassing the latter's immense defenses. 
Per its designs, Kerberos was armed with a huge claw on the left arm, a flame, and destruction light bullet. Furthermore, it can "absorb" the Rouse cards and seal away Undeads. 
==Rouse Cards==
KRBl-Change Kerberos Rouse Card.png|Kerberos Undead Rouse Card (Tennouji's original, also used by Glaive)
KRBl-Change Kerberos Rouse Card (Green).png|Kerberos Undead Rouse Card (movie-only copy, used by Lance)
KRBl-Change Kerberos Rouse Card (Red).png|Kerberos Undead Rouse Card (movie-only copy, used by Larc)
==Behind the Scenes==
===Concept Art===
==Notes==
==Appearances==
* Kamen Rider Blade
**Episode 45: The New Card
**Episode 46: The Ruler's Seal
* OOO, Den-O, All Riders: Let's Go Kamen Riders
Category:Undeads
Category:Villains
Category:Blade Characters
Category:Artificial Undead
Category:Cerberus Monsters
Category:Mythological Monsters
Category:Canine Monsters