Yet another Peggy Sue Fix it Fic by Imouto Kitten

Chapter 1: Despair and Hope.

The war was over.

Voldemort was truly dead, but to say anyone won would be a lie of epic 
proportions.  The Death Eaters, both Junior and Senior, were extinct, as 
was the Order of the Phoenix, and there were only two survivors of 
Dumbledore's Army, one man and one woman. He was the last Potter, and 
she was not only the last Weasley, but the last of the Sacred 28.

Of the British Muggle Borns who had survived the war, most had done so 
by fleeing the British Isles when they had the chance, and even the 
lesser purebloods and half-bloods had been decimated by the conflict.

Voldemort and his followers were all dead, but they had taken any hope 
magical Britain had of thriving once more with them. Harry and Ginny 
still loved each other deeply, but that wasn't enough to keep them going 
when their entire family, both by blood, and by the bonds formed between 
year and housemates at Hogwarts had fallen in the effort to rid the 
British Isles of Voldemort and his Dark Mark.

As the last Griffindors searched the crumbling ruins of Hogwarts in 
seemingly vain hope of finding other survivors of the Battle of Hogwarts 
or anything that could help fix this hopeless situation, every dead 
classmate they past making it harder to move forward another step, they 
eventually come across the remarkably intact Heads office within the 
debris of the collapsed tower that once housed it.

As they tell the portraits of Dumbledore and the other Past Headmasters 
of the grim news of what happened outside this chamber, the portraits, 
representing a historical cross section of some of Magical Britain's 
greatest minds come to an unanimous agreement for the first time in 
centuries.

Acting as spokesperson for the assembly of Past Headmasters, 
Dumbledore's Painting addresses the lone survivors, "Harry, Ginny, what 
I'm about to tell you is a secret that only us portraits may speak and 
only when within our frame in this room and with the consent of the 
majority of our number. Normally, we'd only tell this to a current 
headmaster who most of us approve of, and many of us only learned this 
secret when we joined the ranks of those hanging on these walls. 
However, with Magical Britain decimated beyond the point of no return 
and it being apparent that neither of you are dark enough to risk harm 
to the world at large, we've decided it's worth the risk of imparting 
this secret to living minds aside from a future member of our number."

Adopting looks of determination, the two Griffindors declare resolutely, 
"We promise to make the best of whatever information you choose to 
impart."

"Very well," replies Dumbledore's portrait, "You see, these chambers 
house a secret archive, one which contains many texts, some that were 
ancient even at the time of the Founders, that Hogwarts headmasters 
thought, for one reason or another, shouldn't be allowed to remain in 
the Hogwarts Library, not even in the deepest recesses of the restricted 
section. Many of these texts contain spells, potions, and rituals so 
powerful that they could be catastrophically dangerous even executed 
with the skill of Merlin himself and the purity of a newborn born to 
loving parents. Some of the knowledge contained in this archive is more 
dangerous than even the Horcrux Ritual, but it might contain something 
to help Magical Britain rise from the ashes."

His explanation complete, Dumbledore's Portrait slides up to reveal a 
circular Indentation in the wall, a stone bar engraved with countless 
runes forming a horizontal diameter. Realizing this is a doorknob of 
sorts, Harry and Ginny Grab the bar in unison and start to turn it in 
place. As they do so, they can both feel the wards of Hogwarts feeding 
magic through their bodies as if trying to confirm the pair are worthy 
of accessing what is hidden beyond this lock. When they've turned the 
bar a full 180 degrees, the section of wall that plays home to 
Dumbledore's Portrait separates and swings outward like a door.

Beyond the secret door, the pair find an ancient study littered with 
ancient tomes and scrolls, some printed on familiar parchment, but many 
handwritten and some of them on papyrus and other ancient materials. 
there are even a few texts carved into stone or clay tablets.

###

It takes weeks for Harry and Ginny to search the archives, and it 
would've been impossible if not for the study being equipped with an 
assortment of optical instruments that help in viewing faded ink, 
magnifying highly intricate diagrams, and even enchanted with 
translation charms, as what few texts were in English were mostly 
written in very archaic dialects, and many contained characters that 
matched nothing in the Ancient Runes reference books they managed to 
salvage from what remained of the Hogwarts Library.

Eventually, they came across a time travel ritual that, if successful, 
would allow them to go back and attempt to prevent the tragedies that 
befell magical Britain. However, the ritual had serious limitations and a 
very high cost. For one, it required two subjects with a strong bond of 
mutual love. Second, it couldn't send back anything tangible, only the 
soul, magic, and memories of thesubjects of the ritual, and no further 
than when their younger selves existed for them to inhabit upon arrival. 
Because of these two, the subjects had to kill each other in order to 
complete the ritual, and if their bond wasn't strong enough, they would 
decipate before reaching their destination. At best, failure would 
result in their death, and at worst, their souls would be obliterated by 
the attempt. Third, the power requirements were great. So great, that by 
the calculations the best Arithmancers among the Assembly of 
Headmasters, The Ghosts of Hogwarts, and those whose specters Harry and 
Ginny could summon with the Resurrection Stone assisted the two in 
making, combined with the decimated population, the Ritual would absorb 
all magic in a sphere large enough to encompass the British isles and 
even reach parts of the Continent and Scandinavia. At best, every 
wizard, Witch, and Magical creature caught in the blast radius would be 
rendered mundane, and at worse, the shock of losing their magic would 
kill them. The Leylines would be permanently damaged, every ghost would 
vanish, every magical artifact destroyed, and any structure supported by 
magic would collapse.

Still, they decided the price of failure was worth the chance to undo 
all the damage from the end of the First Voldemort War, the Second 
Voldemort War, and the period between.

They decided to perform the ritual in the Headmaster's office as 
Hogwarts was the strongest concentration of Magic in the British Isles 
and the Office was at the center of the ruins. They cleared the office 
of all furniture and inscribed the required ritual circle into the floor 
tiles. As they could go back no further than August of 1981, they picked 
Halloween of that year. Harry's First Mission would be to try and stop 
Voldemort from killing his parents and convince them to warn the 
Longbottoms of Bellatrix while Ginny's Mission would be to unmask 
Wormtail as soon as possible if Harry failed to alter events enough to 
prevent Sirius pursuing the rat.

As the ritual reaches its climax, Harry and Ginny recite in unison, 
"Whether in heaven above, in hell below, or in the past behind, may we 
meet again on the other side." before plunging ritual daggers into each 
others hearts.

The ritual complete, all the magic in the British Isles implodes, 
collapsing to a singularity within the ritual circle as what remains of 
Hogwarts crumbles upon the lifeless bodies of Harry and Ginny.