Batman and Dracula: Red Rain

Batman and Dracula: Red Rain is a 1991 Graphic Novel Written by Doug Moench and drawn by Kelley Jones.It is an elseworld, not part of the official DC Comics chronology.

Plot
Investigating a series of murders of Gotham's homeless, the victims' throats having been slashed, Batman discovers that the murders are being committed by a family of vampires led by Dracula himself, still "alive" and well. With the aid of a rogue vampire called Tanya -- who was once a member of Dracula's brood until the sight of an innocent child drove her to flee from him, creating a "blood substitute" to spare her from the cycle of death and murder -- Batman, himself bitten by a vampire- Tanya herself, who seeks his aid in defeating Dracula as all Vampires created by Dracula are powerless against his abilities and mental powers, is able to acquire the strength necessary to stand against Dracula's minions while still retaining his humanity. Determined to destroy Dracula's minions, Batman lured them into the Batcave, where Tanya and her followers kept them occupied until Batman detonates multiple explosive charges, destroying Wayne Manor and exposing the cave to sunlight, destroying all the vampires within it. Using his new bat-like wings, Batman flies to confront Dracula, eventually impaling the vampire lord on a tree that has been destroyed by lightning, but at the cost of the last of his humanity as Dracula drains the last of his blood. However, after his "will" has been read by Alfred, Batman assures his old friend that he has nothing to fear; Bruce Wayne may be gone, but the Batman, thanks to his vampiric powers, will now go on forever.