From publisher blurb:
Your ancestors fought a war against vampires... and lost.
Animal Races: Clan of the Bat introduces a new, bat-like race of dhampirs: living humanoids descended from ancient vampires. Fly on winged arms. Consult (or become) a nosferatu-descended oracle afflicted with the curse of the vampire. Turn your back on your vampire heritage, or evolve into a bloodsucking undead creature through a process available to any dhampir character.
Whether you're a fan of bats, dhampirs, vampires, or all three, this PDF is for you.