Souls are real in The Demonata series. They are the most prized thing to a Demonata the body will live but can't think, feel, or nothing but live. The soul can be tortured by the Demonata for eternity.
Without a Soul
Without a soul, your body is a lifeless shell. You are living just not showing any emotion and you can't do a lot of things by yourself. You have to be fed and dressed etc.