The Ruthless Calculus

The second wizarding war drags on for another bloody decade after the 1st battle of Hogwarts. After Tom Riddle's final defeat, six survivors decide to go back in time, to try to change the fate of all those they love. Ruthless, determined, and broken, Harry, Hermione, Ron, Draco, Luna, and Neville return to their Hogwarts years to fight again the war they already won.