Disclaimer: I don't own Harry Potter nor Fullmetal Alchemist.
Chapter 1: Dumbledore Summons the Gate
It was a dark and stormy night and something foul was brewing in the air. Hogwarts is in an eerie silence as Albus Dumbledore is busy working in the Room of Requirement. Inside the room, is a large table overflowing with parchments and worn out quills and pencils. A series of calculations and alchemical circles filled the parchments, but right in the middle of the table lay a book open. The book is leather bound, it looked liked a journal, and it had no title nor the name of the person that authored it. However it was the most curious book that ever been housed in Hogwarts Library.
The book came upon Dumbledore's possession two years ago when he was searching for a transfiguration book that he wanted to read. Walking through the isles of books, he stumbled upon it. It was the only book in the entire library that had no title. Being a curious headmaster that he is, he took it down for inspection and upon opening it, he was shocked by what he read in the first page.
Caution to you stranger whom upon reading this book, you are in great and terrible danger. This book contains the secret of forging the Philosopher's Stone and the Secret of the "Gate." A warning to you stranger, should you ever attempt to open the Gate, using the stone, you must be prepared to take on the challenges that you will face. Fallow the rules of the Equivalent Exchange and you shall not perish. You have been warned.
Two years to that day since Dumbledore had read the book's warning, and now he is on the floor of the Room of Requirement, a chalk in his hand, as he skillfully draw a giant transmutation circle in the middle of the room. Upon finishing the last part of the circle, Dumbledore stood up and admired his handy work.
The circle looks very complex. Eight lines tangents around the circle. Inside the circle, a star of David is circumscribed and within it two more cirlce is drawn. Inside those two circles a five point star finished the array. Outside the lines of the five point star is written:
A Philosopher's Stone I exchange, as it is the key to the Gate. Let the Gate be opened, and grant me an equivalent trade.
After Dumbledore had checked for any mistakes in the circle, he went back to the table to check the next step of the process. Reading the book's instruction thoroughly, he had a nasty feeling in his stomach that he should stop what he is doing. After all, he could be tampering with the dark arts. But two years of hard labor to forge the stone, he ignored the feeling. He walked back to the circle and stood in the middle of it. Looking down the star drawn on the floor, he put his hand inside his pocket and took out a red stone. After two years of studying, toiling and forging, he had finally created a philosopher's stone.
Placing the stone in the middle of the whole array, he went back to the untitled book, to read the final step. The book instructed to place both hands on the tangent lines and draw power from within himself to activate the circle. Five minutes of deep contemplation, in regards of his actions, he went back to the circle and knelt on the floor.
Breathing a heavy sighof concern, he placed both of his hands on a line. Closing his eyes he searched within himself and searched for that power. Finally finding it deep within his heart, he transferred it on the circle. The octagon lines began to glow and soon follows the circle that it contains. One by one the lines began to glow blue. Dumbledore watched in fascination as the pretty light show commenced. As the final line glowed blue, Dumbledore noticed that the stone began to glow as well, but it glowed differently.
The stone began to glow blood red. Dumbledore wanted to stop the activation but it was to late. Dumbledore's face changed from fascination to fear as the whole circle began to glow red as well. Not knowing what to do, he only did what he knew he could. He finished what he started.
The circle kept its glow as black hands began to grab Dumbledore by his clothing, Dumbledore screamed in fear as he tried to pull away. But hard as he tried, he was overpowered as more hands came for him to pull him in. Dumbledore fought with all his might but failed. He was taken in by the black hands that magically appeared out of the circle.
As Dumbledore was pulled in within by the black hands, he began to see things within his mind. It is as if someone is cramming vast amount of information in his brain. Then as quickly as it began, he came to a full stop. Kneeling on the ground, panting for breath, Dumbledore realized that he is no longer inside the Room of Requirement.
Looking up, he saw the Gate. The Gate, the intermediary between Dumbledore's world and the world beyond. The giant black wooden doors is closed as it towered over Dumbledore. It had strange sculpture of people fighting, no trying to lift up a small infant. Dumbledore feeling the exhaustion of the power that it took to activate the circle fell on the floor as he passed out, but not before speaking his desire for the Gate to grant him the equivalent trade. The stone in exchange for anything he wants. So thus his final words, before he collapsed and was sent back to his world, were "Hogwarts is in need of help..."