The Dark Lord had won.
The end had come without noise or notice. One by one, he individually visited his Death Eaters, revealing his return. He spoke of power beyond reckoning, and a new era for Wizardkind. His most loyal lieutenants, he bestowed great gifts upon. His more erstwhile followers were set to other tasks, such as serving as permanently transfigured simulacra of various political figureheads; Scrimegeour, Bones, Thicknesse and the like were as easily replaced as they were murdered.
Alastor Moody was only slightly more difficult to deal with. The following morning’s Daily Prophet read: “THE DARK LORD RETURNS: Dumbledore, Boy who Lived Dead” and beneath the menacing headline was a picture of Not-Amelia-Bones and Not-Alastor-Moody kneeling at the foot of Lord Voldemort who was giving the Hand of Benediction. The message was as clear to the true Moody as it was inscrutable to everyone else: No one can be trusted. You are not safe. Recant. Relent. Retreat.
Moody had long ago learned the tactical value of a complete and hasty retreat. You did not live to tangle with as many Dark witches and wizards as Moody if you made it a regular occurrence to charge headlong into almost-certain death. So with a dull pop, the true Alastor Moody disapparated to a safe house whose location was known only to him, and was never heard from again.
Tom Morfin Riddle was the master of life and death. His True Horcrux gave him mastery over life, enabling him to travel freely from vessel to vessel, body to body, soul to soul. His Deathly Hallows gave him mastery over death: The Spirit Stone, rightfully passed from heir to heir. The Elder Wand, forcefully wrested from the hand of his foe. And the True Cloak of Invisibility, bequeathed to him by his mirror self, his shadowform. He was truly king, and God, and as such had abandoned his previous moniker of Lord Voldemort, and chose the simple epithet: The God King.
The majority of the Wizarding public simply counted themselves lucky: although the God King was quick to mete out punishment, he was also quick to bestow favors, and as long as they kept their heads down and toed the party line, life was actually not so bad. In fact, it was better in many respects. Gone was the bloated, impotent Ministry of the past, whose sole purpose was to maintain the outdated hegemony, not to better the lives of its subjects. The God King did not need to resort to mean, petty politics in order to extend his reign. Any challengers were simply killed. As such, there were no challengers. But also as such, it freed the Ministry to actually do some good every now and then.
More shrewd members of the Wizarding public recognized Voldemort’s change of identity and methods as a brilliant political gambit: history has taught us that tyrants rarely rule longer than a generation or two before being replaced by an ostensibly less tyrannous tyrant. Furthermore, history has also taught us that hope is like a virus, and will take root in the most unlikely of places, breeding and growing until it can no longer be contained. A lesser tyrant will try to quash all hope, and thus allow hope to proliferate: the hope of revolution. A shrewd ruler knows that hope must be accounted for and allowed to fluorish in a controlled fashion. A brilliant ruler will be the very person who provides hope to his subjects. The God King was cruel, yes, but he also brought great wealth to Britain, and His advancements in the realms of health and medicine were staggering. His subjects could live in hope that one day the God King would bestow His blessing upon them.
No one in the Wizarding public knew the true method behind the madness. The truth was that the God King was a man obsessed. Obsessed with a small prophecy he had heard from the lips of a sherry-soaked Divination professor. A prophecy that upon further research was The Prophecy, the one prophecy upon which all others hinged. A prophecy whose fulfillment was the crux of everything. The God King spent most of his days deep within the Department of Mysteries, trying to salvage what he could from the ruined Hall of Prophecy. He sought out and met, under many disguises, with many students of deep, hidden knowledge.
After years of collecting lore, and countless days spent poring over the ancient text, The Transmygracioun, the thought of a ritual began to grow in the mind of the God King, the Ritual of the Starfire, a ritual by which prophecy could be fulfilled and the world be saved.
There has always been a Crux upon which the web of prophecy circles itself around. However it is not strictly accurate to say that there is only one Crux. In every world, the Fate of All Things hinges upon a single choice. Who makes the choice? What is the nature of the choice they must make? Only those Outside Time know for certain. But what is known is that the Choice must be made, and the mere death of one possible vehicle of prophecy would not stop things. The God King knew this much, and he knew that the mantle of the Crux had been passed to him.
What he did not know was that there was another named by prophecy, one who was Fated, in a time of great strife, when all worlds narrow to two, to bring down a great house. A Slytherin boy who had read tales of The Boy Who Lived, who combined the Muggle knowledge of science with the Wizard knowledge of magic and whose legacy was cut tragically short by the God King himself. A Slytherin boy who, emboldened by being Named by Prophecy, took it upon himself to experiment in secrecy, utmost secrecy, with the deepest laws of magic and nature, just like his idol Harry James Potter-Evans-Verres. He made great strides in the field of transfiguration, and had such a fine command that he could manipulate the Form of things on an atomic, even subatomic level. A boy who was desperate enough to overthrow the God King that we would resort to desperate, even insane means.
He was, however, alone, unlike his idol. He had his companion, but unlike his idol, he chose not to seek her counsel. She knew as little of Muggle physics as he did: that is to say, she studied a pair of purloined physics books for a few weeks. She grasped the broad strokes of quantum mechanics without any true understanding. However, she could have been what he needed: a staying hand, someone to shape his curiosity, someone to guide his intellect, someone to tell him, for the love of Merlin and all that is holy, do not try to find out what happens when you transfigure a cubic millimeter of up quarks, just the up quarks, without any down quarks to bind them!
As it was, a young boy’s choice to trust his own flawed intellect over all else was the Crux of that world, and so it was that he fulfilled the final legacy of Atlantis in the worst possible way, tearing apart the very stars in heaven and bringing about the end of that world.