There are two kinds of people in this world: People who look at Batman and say, "Yes, Batman, hooray, forever, erection, Batman, badass, terrific!" and people who look at Batman and say, "Yeah, I see what people like about Batman, but wouldn't he be better if I ruined him?"
This article is about that second group.
Apparently vampires have no interest in basic cape maintenance.
Not a lot of time was spent on an origin story here. In this universe, Bruce Wayne starts off as the regular, human Batman that we know and fear. He wakes up one morning to find a woman biting him on the neck, and she's a vampire, and for unexplained reasons Bruce is totally cool with this and trusts her implicitly, because we all know Batman loves strangers who sneak into his home and steal his humanity.
"I'm cool as long as you didn't get red on the sheets."
It turns out Tanya's a vampire who has come to Gotham to ask for Batman's help fighting Dracula, and somehow, by turning him slowly over the course of a month, she has given Bruce all the strength of a vampire and almost none of the weaknesses or blood lust. This doesn't make any sense according to any vampire lore we've ever read, but any sense this book was planning on making gets thrown out the window when Bruce suddenly grows wings.
"Ain't nobody's going with God now, Alfred. It's pure metal all the way."
After blowing up Wayne Manor and Tanya herself in order to kill a few dozen vampires, Batman then takes on Dracula in an aerial fight for vampire bat supremacy, where he totally kicks Drac's ass in the fashion competition.
At some point in between fights Batman stopped off to buy 80,000 more yards of cape fabric.
Batman manages to kill Dracula, which one would think should just wrap up the whole Batman-as-vampire saga, but it goes on for a while. Batman continues to grow as a vampire and even develops the blood lust that he was never supposed to have to begin with. The blood lust is so strong, in fact, that he finally has to kill someone to survive.
"All his makeup has rubbed off on my face! I look like a giiiiiirrrrrl!"
"NO," he screams, "though this was great, I'm absolutely going to keep eating bad guys," he obviously thinks. Now that he's crossed over into full-on murderous vampire, he decides to go all Dexter on the whole city and proceeds to hunt down and viciously slaughter every single villain available.
Oh no. Somebody stop him. He's killing all the psychopaths in a really awesome way.
There's nothing like a monocle to class up your rampage.
To save himself some trouble in the future, Batman even kills the prisoners safely locked up in Arkham, because really, we all know they're getting out at some point in the next 60 days anyway.
"Warden? I think Batman's a ghost vampire made of blood, do you -- oh, that's the sense you're getting, too. OK."
Obviously something needed to be done, so Alfred and Commissioner Gordon agree to team up with Two-Face and Killer Croc to become a vampire-Batman-hunting team. ("Founding Member of Vampire-Batman-Hunting Team," by the way, is the single most impressive title anyone can ever put on a resume.)
Next of course would be "mutant croc" or "half a red skull rip-off."
This whole thing goes about as well one would expect, and it ends with Batman killing not just Two-Face and Killer Croc, but also Alfred, who offers his blood to redeem himself for betraying Bruce. Batman is tormented with as much guilt as a vampire can be expected to ever feel and asks Gordon to kill him now that Gotham is literally devoid of all evil except for him. Basically agreeing with him, Gordon blows up the Batcave, letting in the sunlight and killing Vampire Batman permanently, along with everyone else in the story.
But at least Commissioner Gordon will live to remember this tragic ... oh no wait, he gets crushed by a giant rock while trying to escape. Never mind.
At last, the city is ... oh shit, everyone's dead.