Change Vampire to something unique

[Megapaco]

Idea inspired/stolen from the movie Day Walkers here, this is probably going to sound dumb. So okay basically in this movie if the vampires did not drink blood after a while they would begin to mutate into a aggressive and savage form. I think seeing something like this in the game would be interesting. Like maybe give the vampire a option of a more stealthy approach or the option of purposely not drinking blood and turning into something similar like a Shambling Abomination. So basically you would have the option of playing with something we have now or playing as a powerful hulking monster like the changeling's horror form with the downside of being very obvious