Building an aboveground tavern, I just had about 40 dwarves and some visitors staying. I had just put up a hospital building which will get a second floor that's a library when suddenly a weremonitor appeared. Unfortunately for my dwarves it was not a computer screen, but a ravening lizard-creature which managed to slaughter 4 of my precious dwarves including my doctor. I was unable to raise my drawbridge as it was only detected inside my walls. I might have to build some guarddog towers.
Once the lizard changed back and was subsequently smashed to pulp by the angry mob I saw that three of my dwarves were in hospital with bite wounds. While I was pondering what to do a message popped up "Ulrist McVictim has been found drained of blood". This was a surprising, since all my dwarves sleep in a communal dormitory, but there seem to be no witnesses. After checking through a few of my dwarves I found somebody with a suspicious relationship. He has only three friendships, one deity and a "Master".
I can't find anything on the wiki about this relationship, so does anybody know what it is? Do I have a vampiric necromancer in my tavern?
Anyway, this does allow me to try to turn my tavern in either a vampire hunting ground. Or if possible in a centre for a vampirism epidemic. Does anybody know how I might be able to feed passing visitors vampire blood?
Edit: I found the real vampire, with about eight "formerly a member of" and tons of low level skills. This does not mean that I'm not interested in answers to my questions however.