Coredegon (Japanese version: Exdeath (エクスデス, Ekusudesu?)) is one of the former Mechtogan created by Fury and the main antagonist of the second arc of Mechtanium Surge under the guise of Wiseman. He is the leader of the four Mechtogan that combine to form Mechtavius Destroyer, along with Slycerak, Exostriker, and Mandibor.
The fearsome Coredegon fights with a power that is unmatched in the Mechtogan universe. His spring loaded chest exposes a mask that when pulled over his face strikes fear in his opponents. Coredegon also mounts an aerial attack with jagged spiked wings that articulate for speed and accuracy during flight. With a sword on his left arm, Coredegon strikes his opponents with overwhelming force.
Coredegon made his debut in Evil Arrival where he destroyed his creator, Fury, claiming that he is a Mechtogan with his own free will. Coredegon, Slycerak, Exostriker, and Mandibor are soon confronted by the Nonet Bakugan, a group of evil Bakugan that were banished to the Doom Dimension years ago that consist of Betadron, Kodokor, Mutabrid, Spatterix, Stronk, Balista, Worton, and Tremblar, where it is subsequently revealed by Mutabrid that Coredegon, Slycerak, Exostriker, and Mandibor are mutated Mechtogan, which is why they are able to survive without a Bakugan host.
Rather than kill the Nonets, Coredegon and his fellow rogue Mechtogan reveal that they intend to head to New Vestroia to kill all the Bakugan there so that they can begin a new age of Mechtogan. However, Worton (the spiritualist of the Nonets) informs the rogue Mechtogan that the Bakugan have moved to Earth. Despite this new surprise information, Coredegon decides to go to Earth instead of New Vestroia with Slycerak, Exostriker, and Mandibor, but leaves before Worton could tell them about the Bakugan Battle Brawlers.
Coredegon and his allies quickly arrive on Earth, interrupting the match between Dan Kuso and Gunz Lazar. Upon arrival, Coredegon comments that he heard the Bakugan lived on Earth now, but didn't know that they were "letting themselves be stared at like circus animals", and blasts Reptak back into ball form after Reptak explains that battling involves rules and honor, and isn't a circus, which Coredegon could care less about. After Slycerak notices how a Bakugan goes into ball form after being defeated and Mandibor wonders what would happen if they were blasted while in ball form, Coredegon decides to test the theory, resulting in a battle with Dan, Marucho Marukura, and Shun Kazami. While his allies are quickly knocked down at first by Jaakor and Radizen, Coredegon is much more resilient against Dan's partner Bakugan, Fusion Dragonoids attacks. However, Coredegon is overwhelmed after Drago increases his speed, prompting Coredegon to combine with Slycerak, Exostriker, and Mandibor to form Mechtavius Destroyer. Despite the massive power boost, Coredegon and his allies are when Dan and Drago summon their own Mechtogan Destroyer, Dragonoid Destroyer.
In an effort to regain their independence, Coredegon and his comrades agreed to a partnership with Wiseman and the Nonet Bakugan in Wiseman Cometh. The Nonets summon the Mechtogan and use their power to aid them in battle. Coredegon and the others form Mechtavius Destroyer again, but are beaten by Dragonoid Destroyer once again.
In Gunz Lives, Wiseman gained enough energy and exposed his true identity, Coredegon. He revealed his use of the Nonets in a scheme to take over the world.
In Evil Evolution he is confronted by the Nonets during his attack on the Brawlers. Later he gives them an ultimatum, suffer the fate of the world or banishment to the Doom Dimension. Coredegon then joins the other Mechtogan to battle against the Brawlers.
In End of the Line, he was destroyed by Dragonoid Destroyer.
- Coredegon has the highest G-Power in the Mechtogan game line.
- Coredegon is the only main antagonist to show his ultimate form in the first episode of his respective season.
- Coredegon, likely because of his mutation, was the only Mechtogan able to disguise as a Human while Clayf and Lars Lion were the only Bakugan who used this ability.
- As Wiseman, he technically is the only Mechtogan who controlled the brawls including the Nonet Bakugan and their abilities (until they summon these Mechtogan).
- The way he took Gunz's appearance and personality for the Wiseman persona is similar to how the D-Reaper from Digimon Tamers took Jeri Kato's appearance, personality, and voice in order to make an infiltrator to spy on Takato Matsuki and his friends.
- Plus they're both part of a third side of the human and titular monster race who are threats to the multiverse.
- Coredegon shares similarities to the Death Phantom from the Sailor Moon franchise in several ways:
- Both adopt a fake identity named “Wiseman”.
- Both manipulate a faction with a vengeance against one of the protagonists.
- Both seek to achieve genocide on a large scale.
- Both are ultimately defeated by the heroes using time travel.
- Finally, both manipulate one of the supporting protagonists into evil (though in Coredegon’s case, it was unintentional).
- In the Japanese version, Coredegon has the same name as Exdeath's name in Final Fantasy V.