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!"