Hercules: Heart of Chaos (Hercules: Heart of Chaos #1)

You can take the god out of the man, but you can't take the man out of the god! Hercules, the fabled half-man, half god warrior, has been stripped of his immortal powers. With the Avengers presumed dead, the now-mortal adventurer has begun to question his way of life and his place in the world. But when his eternal nemesis, the war-god Ares, begins a plan to return the world to the Dark Ages, Herc is drawn back into the fray!