BlackWarGreymon is the super form of SkullGreymon, and is a Dark Spawn warrior in servitude to Malefor and the Demons of Hell. Feared as the "Jet-black Dragon Warrior", it is a Virus-species WarGreymon. Although its creed and principles are the polar opposite of those of the Virus Buster WarGreymon, it exists for the sake of its own peculiar justice. It detests cowardice and foul play, and it doesn't consider itself a fellow of vulgar Digimon, even if they are of the same Virus-species. The full details of how it converted to a Virus are a mystery, and the "Brave Shield" equipped to its back is not engraved with the Crest of Courage.
Intent on destroying the DigiDestined once and for all, Arukenimon created BlackWarGreymon from 100 Control Spires to perform the task. He managed to easily defeat Paildramon and the DigiDestined's other digimon without even trying. But when given the order to finish the job, BlackWarGreymon surprisingly refused to obey Arukenimon and simply flew away, stating that he wasn't going to take orders from someone that was weaker than himself. It would turn out that, due to the number of Spires used in his creation, BlackWarGreymon had developed a conscious mind, separating him from his 'mindless' siblings. But it also made BlackWarGreymon confused about his purpose in life, with many questions that needed answers.
He would encounter Agumon, who tried to help him. But in the middle of the talk, BlackWarGreymon felt a pain in him and left to find the source, destroying the first Destiny Stone as a result. After seeing Azulongmon when he destroyed his third stone, BlackWarGreymon made it his mission to destroy all the Destiny Stones in order to find and face Azulongmon, convinced this was his purpose in life. The DigiDestined attempted many times to stop him but he always got the best of them. Even when the last stone was protected by the combined might of Paildramon, Silphymon and Shakkoumon, BlackWarGreymon managed to take them all out despite the injuries he took, many of which resulted in him spurting oil from his cracked armor. However, when Azulongmon appeared, BlackWarGreymon attempted to combat the Mega, but Azulongmon explained to BlackWarGreymon that all things had a purpose in life. Thankful for hearing that, BlackWarGreymon left to find his purpose.
On December 27th, BlackWarGreymon emerged in the Real World to find/kill Yukio Oikawa for disrupting the balance of both the Real World and the Digital World as he deemed since he created Mummymon and Arukenimon with his own DNA, Oikawa did not belong in either world after realizing his lack of answers for the questions of his existence in the Digital World, which caused Oikawa to see BlackWarGreymon as ungrateful. However, before he could kill the man, WarGreymon intervened and engaged him in battle. The raging battle spread into the nearby city, neither side able to gain the upper hand until the fight was joined by Imperialdramon Fighter Mode, who together with WarGreymon finally defeated BlackWarGreymon. After the battle it took lectures from Wormmon, Agumon and Veemon about the importance of life to convince BlackWarGreymon to enjoy life's pleasures and talk him out of killing Oikawa.
BlackWarGreymon showed up when Cody Hida's grandfather tried to talk Oikawa out of his plan. Myotismon momentarily took over Oikawa's body and with the additional power from absorbing one of the Dark Flowers, fired a blast of dark energy at Cody's grandfather. BlackWarGreymon stepped in front and took the full blast, saving Cody's grandfather's life, but he was mortally wounded by the blast. Oikawa fled and BlackWarGreymon realized that Myotismon was actually controlling Oikawa like a puppet. He used the last of his strength to seal the Highton View Terrace Gate to the Digital World to prevent Myotismon from entering the Digital World. In the process, he found the purpose he had searched for all along and died a hero's death. An image of him is illuminated on the tiles being formed by the first Digidestined's Digimon in the Digital World.
When Oikawa attempted to open the gate, they were thrown into an odd dimension, where Myostismon found himself overpowered by the DigiDestined. In the last episode, all of the original DigiDestined had to trek all the way to their summer camp location as that was the closest gate to the Digital World.
BlackWarGreymon is a reoccurring boss in chapters of Digimon Tamers: Digimon Medley. Each time, he will defeat the Digidestined's Digimon in several turns, but the damage he sustains will carry over from battle to battle.
- Terra Destroyer (Gaia Force): Similar to WarGreymon's Terra Force, he creates a massive sphere of energy and throws it.
- Dramon Destroyer (Dramon Killer): A thrust with his claws.
- Black Tornado: He spins around and creates a tornado around and rushes his enemy.