Disclaimer: I do not own Naruto or any Monster, Fiend, or weapons that may or may not appear within this story only the plot that brought them together.
Prologue v2
Tobirama Senju was an undisputed genius. He has been accredited the creation and perfection of numerous ninjutsu. When he creates a new jutsu, he thoroughly checks and then rechecks all relevant theory no matter how obscure. The vast majority of what he created was for the primary purpose of strengthening his village. Shortly after his brother's death and his inauguration as Hokage, he realized there were times he could use his brother's council. With the idea of the past generations, giving council in a time of need the Niidaime set out to create a technique to do just that.
As he worked on his latest creation, he slowly began to realize the monstrous nature such a technique had. First problem he encountered was the need for a living vessel. Second, would his brother his brother or even he when the time came be happy returning to the land of the living even for a short period. Yet both could be over looked if the need great enough.
The issue that truly made Tobirama stop and rethink the very idea of resurrecting the dead was an obscure theory about the balance of life and death. The theory, well Tobirama saw it as a theory, was a simple religious text. It spoke of the need of maintaining the balance and domain of the Shinigami. Ordinarily, being a man of reason, Tobirama would have ignored such a vague reference to such things as Kamis, but taken into consideration the fact that the Senju's cousin clan had created a sealing technique that called upon the Shinigami he decided the risk of his technique far outweighed the possible reward. Therefore, he gathered all of his meticulously maintained notes he kept, and sealed them away within the villages Fuin no Sho (Scroll of Seals).
It would only a short time later that Orochimaru would steal those notes as he fled the village in disgrace.
Orochimaru is a genius some even say he is on the same level as Tobirama. If you were to ask Orochimaru, he would say that he surpassed the Niidaime. If you were to ask anyone from Konoha, they would say it was the Niidaime Hands down for the deceased Hokage was a good man who worked tirelessly for the benefit of the village, where as Orochimaru worked for himself and his own ambitions. Where the Niidaime saw people to protect, Orochimaru saw lab rats and test subjects. It was Orochimaru's view of people of Konoha and inhumane experiments that led to his status as a nukenin (rogue ninja).
His status really did not matter to Orochimaru, because now after six years he had the perfect plan to get his vengeance on those who had chased him from his labs. His first attempt was left incomplete but he was able to get rid of the one who stole what Orochimaru believed was rightfully his. That had been five years ago and ever since he had been tirelessly worked to complete what the Niidaime had failed to the Kuchiyose: Edo Tensei. Orochimaru had scoffed at the warnings left behind by Tobirama. To him only the week minded heeded to ramblings of some unknown monk. He would soon learn Tobirama's warnings were not as week minded, as he originally believed.
The ritual was rather complicated while at the same time rather simple once the necessary seals were in place. All it required was a seal to summon to call upon the dead, ashes of the deceased to act as a beacon for the correct soul, a living vessel to contain the recently summoned soul, and a seal to bind the soul to both the vessel and under the control of the summoner. The first seal was the most complicated even the slightest miscalculation would result in failure even the placement of the seal required multiple checks and rechecks. This seal either made or broke the technique. Orochimaru's disregard for the theory that caused Tobirama to abandon the completion of this technique was a mistake. If he had looked further into the matter, he would have discovered a theory on a possible boundary, a veil if you will between the worlds of the living and that of the dead.
Orochimaru had everything set up perfectly as far as he knew. The summoning seal was in place and had been check no less than ten times. Two living vessels in this case two unconscious Konoha Anbu. Ashes of two of three deceased Hokages the Shodai and the Niidaime he has not had the chance to collect the Yondaime's yet. When he was to burn Konoha to the ground, he would be sure to retrieve some of the Yondaime's ashes before he launched his assault just for the sake of irony. The final seal was the binding seals.
Orochimaru, Hebi seji, (Snake Sage) one of the Densetsu no Sannin, (Legendary three ninja) and self-proclaimed greatest genius of the elemental continent has made a terrible mistake, and he knew it the moment he completed the ritual. Instead of two zombie-fied Hokages there was a rift. He watched in mild fascination as the vessels, which were directly beneath the rift, slow turn to ash and drawn into what can only be described as a tear in mid air. After witnessing what happens to whatever gets too close to the phenomenon, Orochimaru allowed his baser instinct of self-preservation to take hold and fled.
Had Orochimaru remained he would have observed that the rift was unstable and take note of the fact that it expanded and contracted. What Orochimaru had done in his ambitious attempt to gain dominion over life and death was tear a hole in the veil that separated the world of the living from that of the dead.
Had Orochimaru followed through with the line of research that Tobirama had started he would have learned of not only the veil but also that the soul under goes a kind of cleansing. A person amasses contradicting emotions throughout a lifetime this is especially true for ninja. This chaotic mix of thoughts, beliefs, and emotions upon death is detached from a person's soul. This brew of contradictions is stored beyond the veil while the soul moves into the cycle of reincarnation. Within this cauldron, the remnants congeal into a monstrous form with little to no sentience. It is one these creatures that steps out from beyond the rift into the living world.
With the arrival of such a being marked the day the role of shinobi and kunoichi across the world is fever changed. That moment was the beginning end of era of humans against humans for a new threat had taken a foothold within the world and only time would tell whether humanity would survive or fall because chaos has been unleashed.
AN: This is a rewrite of Chaos Unleashed. I say rewrite but it is more of a reimagining. In this version I will attempt to go into more detail on what is happening without going overboard while not giving the appearance of having my brain puke up chunks of a story.
The good news and bad news is that I have a good idea of where I want this story to go, the bad news it will take me significantly longer to update.
Just let me say that yes I made it so that Orochimaru was responsible for the Kyuubi attack. No, Kushina is not alive. The parings have not changed. There will not be any OCs unless there cannon fodder. Akatsuki will be grey rather than dark (that means they are not vital to the story but will make an appearance). Danzo will be grey but will have a larger role in the beginning. Naruto will not receive the Toad summons the reason will be a plot point.
This will not be the only story I will be working on. I will likely pick one or allow a vote on which one. Mainly I will write this and the occasional crappy one-shot.
I hope to update soon with shorter ANs