Changing History

His world left in shambles, Muggles taking over. Harry Potter was given a choice either go to Hell or go back in time and change the past trying to prevent the future. Harry Potter had decided to change the past, and nothing will stop him from protecting the ones he loved. (Gray!Harry, Intelligent!Powerful!Harry, Vampire!Harry, and Mentor!Dumbledore, Goodish!Voldemort.)