say a 5th level fighter with a constitution of 18 takes the average on hitpoints. that would give him 10+(5.5*4)+20=52hps. if he became a vampire he'd have, taking the average 5d12=32hps. my question is...does he lose hit points? if you have a 5th level fighter with 52hp's and he becomes a vampire...do you reroll his hit die and add the old constitution modifier and then don't add it on new hit die if he goes up in class level? i understand that vampires don't have a constitution score but it seems unfair to take away that many hit points for becoming a vampire. does the damage reduction and fast healing make up for it? certainly. but are they supposed to go down in hp's is all i'm asking.