So, I was thinking about this game book I skimmed through once in high school, and I couldn't remember what it was.
It may have been a supplement, or maybe just a single volume from a multi-volume game; I don't think it was a whole game.
It was about killing vampires. You were vampire hunters, and you killed vampires. There was a really colorful Monster Manual-style section with all these different kinds of vampires, ranging from the classic Nosferatu and Dracula style to totally grotesque, non-humanoid abominations.
It had a fairly extensive set of rules regarding how vampires could be killed. I remember distinctly a rule that staking a low-level vampire would destroy it instantly, turning it to dust, whereas staking a high-level vampire would leave a skeleton, and if the stake was removed it could regenerate. There was an illustration of such a regeneration.
There were plenty of gonzo vampire-killin' weapons. I remember a thing that you wore on your back that was basically a sprinkler that sprayed holy water in a radius around you, so the vamps couldn't get too close without getting burned.
For some reason, I have this idea that it was set in Meso- and South America.
I'm also pretty sure that it wasn't a White Wolf product.
Does this sound familiar to anyone?