Blackheart/Bio & Battles

Centuries of murder in a locale named Christ's Crown, New York, drew the attention of a demon-lord, Mephisto, who created a "son", Blackheart, from the energy of the accumulated evil. Blackheart explored the nature of evil under his father's tutelage, clashing with and failing to corrupt Daredevil and Spider-Man. Mephisto and Blackheart once tormented Daredevil, Brandy Ash, the genetically engineered Number Nine, and the Inhumans Gorgon, Karnak, and Ahura, manipulating their emotions and tricking them. They were soon drawn into Hell for worse torments. Brandy Ash did not survive.

Later, in an attempt to be free of captivity, Blackheart made contact with Misha from the group Warheads and became the source of her pre-cognitive visions. Eventually Misha's squad, Kether Troop, invaded Hell itself and freed Blackheart, who was temporarily in the disguise of Doctor Strange.

Mephisto sent Blackheart to Earth with diminished powers to learn humility. Blackheart would return to Christ's Crown and tempt Daniel Ketch, Punisher, and Wolverine to the town itself in an attempt to corrupt them. The group would eventually follow Blackheart back into his own realm for a final confrontation. He would once again attempt to commission their services, using them to help him finally destroy Mephisto, and taking over his portion of Hell.

Alongside the Grim Reaper, Blackheart brought Wonder Man to Mephisto's realm to fight Mephisto.

Blackheart was "killed" during the final issues of the second volume of Ghost Rider. Blackheart had created a group of Spirits of Vengeance, in order to oppose the Ghost Rider, who recently found out he was Noble Kale. In hopes of killing him, Blackheart tricked him and brought him as a member of his group of Spirits of Vengeance, promising Kale the power to rule in Hell alongside Blackheart. In the end, the Ghost Rider double crossed Blackheart and "killed" him, freeing the other Spirits of Vengeance, and gaining rule of Blackheart's portion of Hell.(from Marvel Database)