A random thought:

What say you interested folk in the ability to harvest scrolls from defeated vampires? Essentially this would be carving out one of their tattoos (Read: One of their crafts/A chunk of their true self) and later burning it as a sort of temporary effect (Maybe lasting only the time it takes for the fire to completely consume it?) Either that or they could slap them on like temporary tattoos and have them fade away, getting weaker and weaker with use. 

Thoughts? I want there to be a good reason for non-humans to stalk vamps. I'm thinking making them the only source of scrolls might fit.