The Battle of Hogwarts is still waged, and Neville kills Nagini. But when Voldemort issues his ultimatum, Hermione talks Harry out of sacrificing himself to a madman who probably isn't going to keep his word. Harry heads into the Forbidden Forest fully intending to go down fighting โ with the entirety of the surviving DA and Order members backing him up. While his friends keep the Death Eaters busy, Harry duels Voldemort. And through some miracle, he wins.
But because Voldemort still has one last Horcrux left, he cannot fully die. Reduced to a wraith once more, he flees the battle, leaving the leaderless Death Eaters to be defeated by the defenders of Hogwarts. Harry watches the feeble wraith disappear into the shadows, grim satisfaction settling in his nerves. The battle is won. The war is over. But at the same time, a more profound realization takes place.
It is now their collective duty as a society, Harry realizes, to make sure Voldemort cannot return. As a wraith, Voldemort is powerless โ without his supporters to aid him, he can't even interact with the physical world, let alone cast any magic. But if Wizarding society is left to continue the same path as it has been before the war, it won't be long before a surviving pureblood supremacist seeks to reinstate him. Which is why it falls upon them, the new generation of wizards and witches, the future of British magical society, to strip down the old pureblood agendas and bring forth a new and more inclusive future. They must get rid of any surviving Death Eaters for good and show the world that the supposed purity of one's genealogy is so meaningless as to be laughably ridiculous, that Magical Britain can only flourish by rejecting that hateful rhetoric. It is a battle that must be waged as long as Harry lives, a constant vigil to ensure the Dark Lord can never return.
. . .
Over a century later, Harry Potter departs this world, greeting Death like an old friend. Over a long and prosperous life, Harry, his beloved wife Hermione, and his best friend Ron have led sweeping changes across the length and breadth of Magical Britain and forged an unprecedented era of equality across all origins and species. And as Harry exhales his last breath, surrounded by numerous children and grandchildren and all the people whose lives he and his friends changed for the better, the last remaining trace of Voldemort also dies with him. After being forced to watch from the shadows for the past hundred years as every last vestige of the beliefs he espoused were systematically torn down in every facet of society, the once-feared Dark Lord fades away alone and forgotten, never to rise again.