Cerberumon

Cerberumon is a fictional character from the Digimon franchise, an Ultimate Level Demon Beast Digimon. His name comes from the Greek word, Cerberus, who was three-headed dog that guarded the gates of Hades in Greek mythology. He's known as Cerberusmon in Bandai products.

Description
Cerberumon resembles Cerberus with hooked Chrome Digizoid claws above his paws. He is nicknamed the "Infernal Watchdog" and "Watchdog of Hell" since he guards the entrance to the Dark Area. His body is protected by a hard, living shell, and if it bears damage, it has the ability to instantaneously repair itself. The head armors on both his shoulders each have their own minds and instantly sense attacks from any direction, which they then transmit to the main head. Despite his evil-sounding nicknames and job, he is actually a Vaccine-type.

Abilities
His Chrome Digizoid claws can tear through most things easily. He has a healing ability located in the wounds. His shoulder armor equips him with consciousness and his body armor can perceive attacks from all directions. With the X antibody he becomes Cerberumon X.

Attacks

 * Hell Fire (Emerald Blaze): Spews out greenish flames from each of the mouths.
 * Inferno Gate (Portals of Darkness): Creates small empty portals to the Dark Area that pulls his enemies into. Cerberumon has an advantage while he is in the Dark Area.

Digimon Frontier
Cerberumon was the first Digimon encountered under the influence of Cherubimon, whom the DigiDestined in Frontier had to battle. They stumbled upon him after their arrival in the Digital World, when he attacked Fire Terminal and absorbed the Fractal Code for Fire Town while looking for something called a Spirit. During this process he also attacked Bokomon and Neemon who were running towards the children. When Takuya tried to lead Cerberumon away from the others, he found the Spirit of Fire, which gave him the power to become Agunimon for the first time. He then battled Cerberumon, who however had the advantage with the Portals of Darkness attack before being beaten and purified by Agunimon which reverted him to a Digi-Egg. Takuya used his D-Tector to release the Fractal Code which restored the village and the nearby area.
 * Voiced by Steve Kramer.

Digimon Savers
When Masaru Daimon, Tohma H. Norstein, Yoshino Fujieda, and Hiroshi Yushima were tied to posts in the Holy Capital's Arena, Baromon unleashed Cerberumon on them. Kamemon freed their Digimon whom attacked Cerberumon and freed their partners. Cerberumon dodged Masaru's punch and ran towards Yoshino who fought him bullfighter style. This gave Masaru the opportunity to punch Cerberumon. When Masaru was about to Digivolve Agumon to fight Cerberumon, Baromon spared them when he discovered Masaru's connections to Suguru Daimon.

Digital Monsters: D-Project
Cerberumon evolves from Garurumon, and can evolve further into SaberLeomon.