Crossing the Gate
As soon as Orochimaru found out that on the other side of the gate was a door he wanted to try to get to the other side. He has seen a door before when he resurrected the dead and at the moment he lost his hands. Orochimaru like the idea of conquering another world, and possibly find talents. Orochimaru has branded most of his servants with a sacrificial seal which would claim their lives when a sacrifice was needed. Once again this sannin started to perform Kuchiyose: Edo Tensei which summoned the dead. At the moment he activated the jutsu he saw the door. Orochimaru stood in front of the door, in seconds his head was filled with knowledge which he didn't receive before since he never bothered to linger there that long. The door suddenly said, "You have brought a great admission fee, what do you wish to do with it."
Orochimaru smiled, "I want to go to the other side and knowledge."
Within minutes tons of knowledge flooded Orochimaru's mind. He saw billions of jutsus within seconds, different methods of biological creation and most of all… Alchemy.
The black tentacles of the door rapped around Orochimaru and pulled him to the other side of the gate.
The next moment he woke up he was lying on the floor of a seemingly empty mansion. On the wall there were many books. He did not get up, instead he stayed on the floor, closed his eyes and tried to recall everything he saw at the gate. He mentally pictured every jutsu he could remember, recalled all facts that would help him with creating a powerful being, in the end he thought of Alchemy which he didn't see as important but still kept in his mind just in case it would have any use. He laid on the cold floor for a long long time, and did not want to get up since he wanted to draw as much out of his memory as possible. Eventually he recalled everything he could possible remember and went to sleep.
The next morning, Orochimaru was woken up by a knock on the door. In fear that the owner of the house would find him he hid under the staircase. After a long while the knock continued, he suspected that no one was in the house and that this visitor didn't know it. He went to the door and opened it. At the door was a boy with a long brown hair wearing a red robe, the boy said, "Excuse me, I'm looking for Ms. Dante." Orochimaru guessed that Dante was the owner of the house, so he thought of assuming the role of a housekeeper and said, "Oh, she is out. She didn't tell me when she'll be back. Would you like to come in?" The visitor said, "Yes please." Orochimaru led the boy into the empty living room. As they were walking Orochimaru asked, "Sir, what is your name? So I could tell my master when she gets back." The brown haired visitor said, "Oh… my name is Alphonse Elric."