I plan on making a series of fantasy novels mostly about an empire that the protagonist of my first novel creates. However, the mc of my first novel, Ares, is a villian. Over the course of the novel Ares proves to be very sadistic, has a couple psychotic breakdowns, and is more than willing to kill or sacrifice anyone he believes doesn't deserve to live. I plan on having Ares and his allies succeed in creating their empire, which means that he will destroy the heroes who are trying to protect innocent civilians and their homeland. In my opinion it's good to have the villian win once in a while. It keeps things more interesting if the reader can't say for a fact that the good guy will win but I want to know what other people think about having the villian win. So in your opinion should the hero always defeat the villian?