Omnimon

Omnimon is a character in the Digimon series and is one of the Thirteen Royal Knights. He was known as Omegamon in the Japanese version, and is the result of a fusion between WarGreymon and MetalGarurumon. The head of each became fused onto Omnimon's arms, enabling him to use two attacks: Transcendent Sword (Grey Sword in Japan) with the WarGreymon arm, and Supreme Cannon (Garuru Cannon in Japan) with the MetalGarurumon arm.

Description
When WarGreymon and MetalGarurumon DNA Digivolve, their heads become Omnimon's left and right hand respectively. When X-modified by the X-Antibody, he becomes Omnimon X.

Digivolution

 * Mega (Ultimate) - WarGreymon + MetalGarurumon
 * Mega (Ultimate) - Omnimon

Attacks

 * Transcendent Sword (Grey Sword): Slashes enemies with his sword from WarGreymon's mouth.
 * Supreme Cannon (Garuru Cannon): Shoots energy balls from his cannon from MetalGarurumon's mouth.
 * Double Shot (Double Torrent): Releases streams of fire and ice from both heads.

Our War Game
The story took place during school holidays when Koushiro discovered a digimon egg suddenly hatched. It started to eat computer data and digivolve quickly. Informing Taichi about this, the two of them sent Agumon and Tentomon to beat this new digimon. Meanwhile other kids were doing different things else and could not offer help. The new enemy digivolved twice to become an ultimate and beat Agumon and Tentomon, and even hacked NTT and America. After some effort Taichi and Koushiro mangaged to contact Yamato and Takeru to join in. Agumon and Gabumon digivolved to megas but the new digimon also digivoled to Diaboromon. When the two were about to win, however, Taichi banged hard on his computer in rage that their attacks were missed. This made Wargreymon unable to move and both Metalgarurumon and it were seriously injured by Diaboromon. To make things worse, Diaboromon hacked Pentagon and launched a nuclear missle, which would explode in ten minutes. It started to copy itself over and over such that they could not find the fuse to deactivate the missile. In the last attemp, Wargreymon and Metalgarurumon went to fight the Diaboromons, with many children from all over the world wished them good luck. They were surprised to see that the area was filled by more than 16,000 Diaboromons by that moment. Both the megas were quickly defeated under the shower of attacks. Seeing this, Taichi and Yamato digitized and went into the computer world, giving support to their partners. At that moment a miracle happened. The children's supportive emails circled them. Both the megas enlarged and their bodies disappeared, each replaced by an arm. Energy flowed from the emails and a new body began to form between the arms. The emails disappeared and a new digimon was born: Omnimon. All the Diaboromons fired at it, but it merely sprang out a huge Grey sword from his left arm and slashed back all the attacks to the enemies, killing about hundreds. Then it unleashed a massive Garuru cannon from his right arm and fired a powerful hit, which exploded during impact on the network wall, spread outwards and killed thousands. In four hits all the Diaboromon clones were eliminated, leaving only the original. It started to move so fast that Omnimon was not able to follow it. When there were only 30s left, Koushiro redirected thousands of other children's supportive emails at Diaboromon to give him massive lag, and Omnimon was able to defeat him and deactivate the nuclear. ===Digimon Adventure 02

Revenge of Diaboromon
Three years later, when Diaboromon was discovered to have survived, Omnimon went into the Internet to deal with him once again. With some help from Angemon and Angewomon, who helped distract Diaboromon and hold him down, Omnimon was able to administer the final blow with his Transcendent Sword, essentially destroying Diaboromon, but it was a trap for all of the Kuramon to get through to the real world. The Kuramon formed Armageddemon, and Omnimon was able to follow it the real world to deal with it, but because he used up too much of his energy coming back to the real world, Omnimon was no match for Armageddemon at his full strength. During the battle Omnimon's arms were separated from his body and in the end Omnimon gave the rest of his energy to Imperialdramon Fighter Mode, creating Imperialdramon Paladin Mode, where his main body transformed into the Omni Sword (Omega Blade in Japan) while the arms reverted back to Agumon and Gabumon.

Battle of Adventurers
Omnimon later appeared in a fifth Digimon movie. This Omnimon opposed the Digimon Mephistomon, who was spawned from the data of an Apocalymon. Unfortunately, Omnimon failed to stop him, and had to assemble Takato, Rika and Henry to fight Mephistomon for him when the evil Digimon escaped into the real world of the Digimon Tamers universe. Omnimon was unable to emerge into the real world himself.

It is unclear if this Omnimon was an inhabitant of the Tamers Digital World or not, but an Japanese option card that was released in conjunction with his movie appearance was given the name of "The Dimension Crossing Hero", which implies that he and Mephistomon existed outside of the Tamers universe.

This Omnimon referred to the Tamers as DigiDestined in the dub, as a throwback to the older seasons.

V-Tamer
Omnimon is the third Mega Digimon Zeromaru had to fight, the partner of Hideto Fujimoto of the Alias Three, made up of Org the WarGreymon and Meruga the MetalGarurumon. After being defeated by Zeromaru, Omnimon would later help him out in the fight against Arcadimon. He is the only Digimon of the Alias Three that was not destroyed.

Digimon X-Evolution
He is the confident leader of the Royal Knights, initially carrying out Project Ark almost to the letter. He is a follower of Yggdrasil, a super-computer governing the current Digital World. In X-Evolution, he is the main policing power, although he acts against informants and those betrayed with unprejudiced force. When Gallantmon confronted him about Yggdrasil, they were unable to agree about the nature of Project Ark and so they fought, ending with the other Knight's demise. This event is what made Omnimon seriously start to question Yggdrasil, shaken as he is by his friend's death. But even so, he still carried out Yggdrasil's orders. It was only when Alphamon saved Omnimon's life and gave him an X-Antibody that the Knight's eyes were really opened to Yggdrasil's true motives. Transforming into Omnimon X, he destroyed Yggdrasil with All Delete, resetting the Digital World as a result.