Make NPC\'s run away from vampires or if the NPC knows he is strong anough attack you on site making it dangerous for Vamps to walk into towns + if they walk
in the sun they would get badly hurt so there walk around time would only be say Night time and maybe a very cloudy day.  
And maybe Players could be rewared for hunting
and killing Vamps .

(How do I change my username without making a new account)