With two monsters remaining (Both zombies) I had my character worship at an altar of Dracul for the extra level of experience. When I killed the first zombie Dracul gave me a warning shot and subtracted 5 piety (1 piety remaining). When I killed Frank the Zombie (end boss) I got the victory box detailing the rewards I had unlocked as well as a dialog box saying that Dracul was displeased with my behavior (piety -4) and that now I was dead.
While I'm not sure if this is a bug - with the order the events trigger, it is possible to die after defeating the final boss if a character worships Dracul (and possibly Taurog but it would take some doing) My character didn't get the chance to retire. This might be a bigger problem when you can access the town.
Thanks for making such a great game, I'm looking forward to the start of the E3 demo/beta.