In order to stop yourself from getting consumed by the Insanity of your vampire self, you are going to have to drink blood, drinking blood of the innocent can result in consequence and if you don't then you can end up dead. You are a vampire, and you are equipped with all sorts of skills, Though the combat can get repetitive it isn't a easy thing, it gets very challenge and one wrong move can get you killed, I won't spoil the story, but it's very very good.