Centuries of murder in a locale named Christ's Crown, New York, draws the attention of a Hell-lord,
Mephisto, who creates a "son," Blackheart, from evil energy. Blackheart returns to Christ's Crown and lures
Ghost Rider,
Punisher, and
Wolverine to the town, hoping to recruit them in his war against Mephisto. When the three refuse, Blackheart brainwashes the entire town and kidnaps a young girl all three men had befriended. The group follows Blackheart and the girl into his realm and defeats him. Unexpectedly, the girl offers Blackheart forgiveness, which he does not know how to respond to. It is later revealed that Blackheart only needed the girl's blood. Brandishing a dagger tipped in her blood, Blackheart kills Mephisto and takes over a portion of Hell. Blackheart creates a group of
Spirits of Vengeance to oppose the Ghost Rider,
Noble Kale. Blackheart tricks Kale and tries to make him as a member of his group of Spirits of Vengeance, promising Kale the power to rule in Hell alongside him. Ghost Rider double-crosses Blackheart, freeing the other Spirits of Vengeance and gaining rule over Blackheart's portion of Hell. Blackheart concocts a scheme to bring Hell to Earth and steal the souls of the planet's residents. As part of the plan, he assumes a human form and runs an operation in Las Vegas that sees him create several clones of
X-23 and bond them to genetically created
symbiotes. After Ghost Rider accidentally transports Hell to Las Vegas, Blackheart is confronted by Ghost Rider,
Venom,
Red Hulk, and
X-23, and summons four creatures that represent the antitheses of the four and sets them against the heroes. In ''
Avengers Academy: Marvel's Voices'', Blackheart is sent by Mephisto to retrieve the adolescent time-displaced souls of
Billy and
Tommy Maximoff from the
Avengers Academy campus. Despite viewing the twins' souls as innocent, Blackheart reluctantly follows through with his father's orders but is thwarted by Bloodline and
Escapade. Influenced by Escapade's powers, Blackheart lets the boys go and returns to Hell empty handed. As punishment, Mephisto turns Blackheart into a human and banishes him to Earth. Blackheart requests shelter at the Avengers Academy and is reluctantly allowed to join the student body, eventually taking the name "Gabriel" as an alias for his human form. Blackheart is implied to be bisexual, as he flirted with
Kid Juggernaut shortly after arriving at the Academy. == Powers and abilities ==