Vampires are pretty well represented in Terry Pratchett’s Discworld books, but there’s a big difference between the vampires who drink blood and the ones who are in the League of Temperence.
I’m thinking of the Magpyrs, specifically. I mean, they were able to resist things like garlic/daylight/holy symbols for a while, but then their immunity disappeared when they panicked, then backfired on them. They were also pretty stupid, which was sort of the whole point of the book.
There was also Dragon King of Arms, but I don’t remember how he was “killed.”
However, the vampires who’ve given up blood don’t seem to be as vulnerable to things like garlic and relgious symbols, and they aren’t nearly as stupid. There only three I can think of are Lady Margolatta, Otto Chriek, and Maladict. I don’t know if there are any more.
I assume Maladict had to kiss the picture of the Duchess to join the army in Monstrous Regiment, even though it doesn’t specifically say that he does (it describes him signing his name and getting his paper “shilling”). The squad also marches during the day and Maladict doesn’t seem to have any problem with that.
Otto does turn into dust when his camera flashes, but I’m not sure if it has to do with the light or something else (Maladict didn’t crumble into ash when Otto took pictures of the squad because he was standing behind Cardorundum.)
Of course, the vampires in the Temperence League change their obsession from blood to something else (taking pictures for Otto, coffee for Maladict, and possibly manipulating people for Lady Margolatta? I don’t really remember what her’s was.)
So basically, all that rambling was to ask if drinking blood makes the vampires on the Discworld stupid and vulnerable to being killed by traditional methods?
(This isn’t exactly the best OP I’ve ever written, but I’ve had this idea rattling around in my skull for a while, and I wanted to see what other Dopers had to say.)