The heroes of the DC Universe are currently desperately searching for a cure for vampirism to combat the forces of darkness in DC vs. Vampires, but they haven't realized they already have one in the form of John Constantine. The vampires have nearly wiped out all life on Earth, infecting anyone they deem worthy, such as Wonder Woman or Green Lantern. The only solution Earth has left is to find a cure, but most are unaware that the Hellblazer currently has one.
In the pages of DC vs. Vampires, written by James Tynion IV and Matthew Rosenberg with artwork by Otto Schmidt, Earth is currently under attack by a vicious group of vampires who have slaughtered or turned the majority of Earth's heroes. They started with Green Lantern, then Wonder Woman, and have even taken Superman. Their assault has been relentless and seemingly unstoppable. Lex Luthor managed to pass his immunized blood onto Batman, which eventually found its way into the hands and veins of Harley Quinn, making her seemingly the only cure for this vampire menace.
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Despite the plot's insistence that Harley may be the only cure for the vampire threat, it's been proven that John Constantine's blood is deadly to vampires in its own right. John has been shown to be alive and well in the pages of DC vs. Vampires #4 before the world falls, and is shown again in DC vs. Vampires #7 in the hidden city of Kandor. Since John isn't dead or vampirized in any way, there's no reason the heroes couldn't turn to his blood for aid. After all, what they're up against is just run-of-the-mill vampires, while John was able to use his tainted blood to kill the King of the Vampires, who was stated to be the first
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