Hi, I am a new DM and I am playing with new players (meaning this is the first time we all play D&D). Most of the players made "normal" good PCs, but this one guy decided to go for an evil vampire.
During combat this presents very few problems. They fight, stuff dies, and they loot and move on. However, out of combat the vampire keeps doing all kinds of unexpected stuff that totally conflicts with the others. As an example this stuff happened as they traveled to Winterhaven (we are running Keep on the Shadowfell).
On the road outside of Winterhaven are three graves along the road. The Vampire of course wanted to dig them up and look for some loot. (That didn’t sit well with the lawful cleric.) I told the vampire that the gravestones read something like “Here lays Jimmy, Bob and Jane Dolton” with the sub text “Poor in life…. Still poor” Gave everyone a good laugh, but more importantly the vampire didn’t dig it up. (However he went back later without the party and did it anyway)
Once they got into town and visited the market the Vampire decided to try robing the smithy. In hind sight I ran a way to easy skill challenge for him on that so he got away and became wanted in town. He got some nice loot as well (couple of platinum).
The question I would like to discuss here is what would you do or suggest I do to help manage this PCs action not to totally ruin the game for everyone else but at the same time not to spoil his fun in being evil?