The Stonehenge Solution by Brian N. Johnson is a fanfic and it's free.
The Stonehenge Solution
Chapter 2 - Harry's Secret
For sixty years Harry had been watching the mundane and magical worlds collide repeatedly 'in the shadows' as it was said. He concluded one thing long ago after the death of Riddle: The conflict between the mundane and magical worlds, and also within the magical world about the mundanes, would never end, at least not well.
Harry studied and researched the problems from many angles. In the end, he decided that no fix would or even could make all sides happy. Thus everyone was doomed to failure. He wanted to believe otherwise, but he knew it would never work.
Another conclusion that Harry made was that someday the Statute of Secrecy would fail. Somehow, someway, it would be no more. Then the mundanes would learn the truth. Learn that they had been lied to, manipulated, and abused for centuries. There was no way those feelings would not result in bad things happening. As the saying goes, once the powder keg was lit, it was way too late to stop it. Such a powder keg would destroy both worlds.
For years Harry considered solution after solution. At best many would only be temporary. Just like the Statute of Secrecy will fail, so will all plans fail because at the heart of the problem you had two separate worlds where one would always end up harming the other and the other jealous and angry.
Even if there were draconian laws to ensure that magical people never harm a mundane, or normal if you wish. Some magical person or group would do something inexcusable and fail to cover it up completely and the worst would happen. It may be a slow or fast destruction, but it would still be destruction in the end. An end where the vastly smaller population of magical people would lose badly.
The only option that Harry was not loathe to consider was to truly separate the two worlds. Move one group to another planet a very great distance from the other. An insurmountable distance. But if it was not insurmountable to do that it would just be another temporary solution. How could both sides be at a distance that can never be reached? They can't.
Bringing the solution ideas back to the realm of possibilities what would the solution be? When does "What is the least worst solution?" become an acceptable solution? Or as it was said long ago:
"For the lesser evil can be seen in comparison with the greater evil as a good, since this lesser evil is preferable to the greater one, and whatever preferable is good"
- Aristotle
No, that's never "good" just more acceptable.
When Harry came up with his "most acceptable" solution he was in shock at his callousness. He had to step away from the idea.
It took Harry quite some time to be willing to think about the idea more than a little and he wondered how and why. Then he remembered his primary school days, a lesson about death. The seven stages of death to be precise.
1. Shock
2. Denial
3. Anger
4. Bargaining
5. Depression
6. Testing
7. Acceptance
During the last few months, he could recognize many of the steps he had recently taken regarding his idea.
Acceptance. He may fail, but he wondered if he could keep his solution entirely to himself so that he would be the only guilty one. The only one to be directly responsible for the great crime he was considering.
After delaying seven months, Harry finally began to work on a real plan. A plan that took years and years to work out how to make it work.
Harry's solution was simple in a way but very difficult to execute properly.
The first issue was having enough magical power to accomplish the task. That turned out to be much easier than expected. Fourteen major lay lines traveled below Stonehenge.
Then the question was "where" because Stonehenge was very popular in both worlds with over a million visitors each year. Not even a Fidelius Charm would work there. However, that answer turned out to be simple too. Under Stonehenge. At about a half-kilometer down, the temperature should be a bit too cool for comfort. This is nearly perfect when heat is added by activities making the site nearly comfortable.
Harry, with help from the goblins, proceeded to buy six safe houses around the country including a small farm near Stonehenge oddly enough. All six properties were remodeled and warded. Another pair of house elves were bought for each property and sworn to House Black. The pairs soon had the six places prepared to the highest standards. Each house was stocked with everything that might be needed if ever used.
The farm's barn is where the house elves got to seriously work. First, they built a very comfortable home in the barn's loft for all of them. Mainly it was the new pairs working here, but the two from London assisted when they could.
After building a concealed basement under the barn, the elves dug a one-meter diameter shaft straight down, vanishing the material not transformed as they went. They installed waterproofing. Lined the shaft with rebar, installed a ladder, and cement. Lastly, they installed a fresh air duct, electricity, lights, drain piping, and a communication cable down the entire length. Mainly these items were for appearances in case of mundane inspection but would serve as a backup too.
Once they reached the half-kilometer in-depth, the elves dug out a five-meter-high domed room. A new three-meter diameter shaft was dug toward Stonehenge at a slight up angle to drain any leaks back to the heavy-duty sump pump near the ladder. On the bottom of the horizontal shaft, a half-meter-wide walkway was installed. The utilities ran overhead.
Even working six four-hour shifts, all day, every day, it took the elves nearly two years just to reach the sight directly under Stonehenge.
There the elves constructed a heavily reinforced, ten-meter high, twenty-meter diameter, domed chamber with a flat cement floor.
Finally, the elves installed high-quality black marble on the floor. They used their magic to join the pieces so there were no seams at all on the floor. Thirty-six cardinal points of the compass were marked on the walls. Then the fourteen Stonehenge lay lines were marked upon the wall using the compass as a guide.
A small solid pin was glued to the center of the floor to be used to make perfect circles.
Harry opened a large book with the details of the ritual he had designed over the last decade. The elves proceed to set up several tables around the edge of the room. Then they began placing items in some order they already knew. One table held dozens of small chisels and wooden mallets. Other tables held blocks of gold and silver next to crucibles. What looked like potion ingredients and gems were being spread upon the remaining tables.
Harry watched the house elves proceed to carefully measure and mark the floor in dozens of places with thin colorful sticks of chalk.
A chair was unpacked for Harry to sit down to resume checking his notes and plans yet again. Several hours later the elves finished marking and drawing on the floor. Harry thanked them and set them home. With his wand and book in hand, Harry began doubling-checking every mark with various measuring spells.
The next day Harry returned to double-check it all again. Once he was satisfied he began casting spells on the tools. Soon several were moving on their own, carving specific colors in different ways. Some were creating square channels. Another tool was carving out round holes. Some circles were being carved with a "v" shaped tool. For hours Harry conducted a symphony with the hammers and chisels. Brushes and small scoops were collecting rock chips and dust ensuring nothing was left to interfere. A second day of etching out many rituals marks. Many blue and red chalk marks remained still, there for some other purpose.
The following morning was spent checking everything one more time. Harry had months until the spring equinox would occur, but there was still lots to do and a schedule to keep.
Two days later with the full moon shining down on Stonehenge Harry began a long spell with complicated wand movements and an unforgiving chant. Just as the moon reached its peek silver began to flow from four different crucibles into the "v" shaped lines. Twenty minutes later Harry slumped into a chair with sweat dripping from him.
When the sun rose, the silver began to glow brightly. It smoothed out and made every silver line perfect. The glow faded until it was just noticeable if you were looking for it.
Such preparations and complex castings became routine for the next several months.
Slowly the primary ritual was coming together and building up stores of magical energy from the lay lines and Harry. As winter approached spring, the power continued to grow. Harry knew that if there was a mistake now that Stonehenge would no longer exist. Instead a very sizable crater would. But that would be the good news, the chaotic spell storm that followed for a year and a day would be the true disaster.
Three days before the spring equinox the ritual was fully prepared. Every scrap of material outside of the ritual markings was cleared away. Even the chalk on the walls had been removed.
Behind Harry, as he stared at the ritual gain, a great round door was set to close. The last spell he would cast in this chamber would pull that giant plug closed so nothing could leak out unexpectedly.
Everything was set, but could he do it? Could he be Albus for his damned "greater good" and truly begin the ritual?
No, he could not be Albus. He would rather die first. Harry sighed and drew his wand. He cast a final simple spell and the great diamond floating there in the center began to spin slowly. Less than once a minute for now. When the equinox began it would grow faster until the zenith of the sun in the sky above Stonehenge. Then the diamond would shatter into the finest dust to rain down on the entire ritual. Billions upon billions of specks of diamond, smaller than the finest sand, each linked to a life never to be.
His silent tears did not stop him from pulling the great door closed. After watching the rock seam disappear he turned and walked away.