Author's note: A special thank you to Darksoul2142 for helping me on the grammar and spellings.

The Background

Ten Million Years Ago, the Precursors created the two dominant species to uphold the Mantle of Responsibility. These two species were known as the Forerunners and Humanity. However, when the Precursors decided that the Mantle of Responsibility would be passed on to Humanity, and Humanity alone, the Forerunners rose up against their creators and brutally eliminated the Precursors.

At 110,000 BCE, or roughly 9,890,000 years after the Forerunner-Precursor War, the Forerunners rose as the dominant species in the whole Milky Way Galaxy. Standing defiant against the powerful Forerunners were Humanity and San 'Shyuum. Around the same time, Humanity and San 'Shyuum discovered the Flood. The Flood was a parasitic being that consumed all biological life forms. Horrified by the flood, Humanity and her San 'Shyuum allies waged war against the Flood. In a desperate attempt to recover their loss and prevent the spread of The Flood, Humanity invaded Forerunner territory.

At 110,000 BCE, the Forerunner-Human war officially started. With Humanity fighting a two front war against the Flood and the Forerunners, Humanity's military forces were on the brink of total annihilation. However, in the time of crisis, Humanity was able to create a solution against the flood. Manipulating the genes of one third of Humanity's population, that when consumed by the flood, will cause the Flood to destroy itself. The solution was deemed effective, as Human reclaimed worlds after worlds. With the threat of the Flood gone, Humanity's military under the leadership of Forthencho fought a losing war against the superior Forerunner military under the command of the Ur Didact.

At 109,000 BCE, the remaining human forces were crushed by the Didact in the final battle of Charum Hakkor. The Forerunners devolved Humanity into many different primitive species in the name of Humanity's perceived violation of the Mantle. The Forerunners would compose many humans to index their genetic memory, in the hope of finding the solution that destroyed the flood. Forerunner dominance in the galaxy would span for tens of thousands of years.

100,300 BCE, the Flood returned back to the galaxy. The Forerunners, weakened by the previous conflict and its own internal political struggle, were unable to put up a successful defence against the Flood. The Flood devoured everything it touched, and the Forerunners retreated steadily. In the ongoing war against the Flood, the Forerunners were able to learn the horrifying truth: The Precursors were the Flood. In a final desperate attempt, the Forerunners activated the Halo Installations, cleansing the galaxy of life, and then reseeded all life in the galaxy. However, the Forerunner-Flood War achieved the purpose of the Precursors: to shatter the Forerunner confidence in their belief of the mantle. The Forerunners lost their confidence in their own mantle of responsibility, and marked humanity as the sole reclaimer of the mantle as was intended by the Precursors. The Forerunners left the galaxy in the hope of restarting their way of life, an atonement to the sins they caused during the time of their dominance.

However, unknowingly in another Milky Way Galaxy, there was another Humanity on the rise. The Precursors, after being chased and almost wiped out by the Forerunners, debated their course of actions. The majority of the Precursors argued to seek revenge against the Forerunners, and they are turned into the flood. The remaining Precursors decided to abandon the Milky Way galaxy and restart what they have done. The Precursors created a race called the Leviathan in a whole new Milky Way Galaxy, but just like the last time, the created revolted against the creator. The Leviathan rebelled against the Precursors, and the Precursors fled the new galaxy to stop further bloodshed. Yet, before the Precursors left the galaxy, they implanted the seed that will eventually cause the rise of Humanity.

The Leviathan became the dominant species in the new galaxy, but it faced a problem: the balance of organics and synthetics. In the hope of creating a solution, the Leviathan created a semi organic synthetic race known only as the Reapers. The Reapers are all under the command of the AI named as the Catalyst. The Catalyst came to the conclusion that organics are naturally violent, and that the conflict between synthetics and organics always escalate in size. To ensure the overall safety of the galaxy, the Reapers thought to destroy every advanced organic species. Hence starts the Reaper cycle, starting with the Leviathans. To ensure the success of the cycle, the Reapers build the system of the mass relays as a way to stagnate each future species from achieving a high level of technological advancement . The plan proved to be a success, and many species were harvested by the ruthless Reapers.

To modern day in the Mass Effect universe, the harvest of the organics have begun already. One by one the worlds of organics were consumed and harvested. However, different from each previous cycle, this cycle has one exemplar that stands in defiance against the Reapers. His name is as John Shepard. This is the story of the fate of the New Milky Way Galaxy.

Forerunners

The Iso-Didact sat quietly in the bridge of his flagship, Guilt of Consequences. It had been over 100,000 years since he had activated the Halo array, and he still debated whether or not there was ever a better solution. If only the Ecumene followed the advice of the Ur-Didact before the flood went out of control, then the face of the galaxy would be completely different. After the activation of the Halos, the Forerunners fled the Milky Way Galaxy and travelled through intergalactic space for almost 100,000 years. 100,000 years of atonement, 100,000 years of regret for the damage that the Forerunner has caused to their home Galaxy and 100,000 years to relearn the fundamentals of the Mantle.

"Offensive Bias." The Didact's armour's ancilla called to the second in command of the remaining Forerunner Fleet.

"Didact, long range scanner shows something quite unusual."

"Show me."

Offensive Bias suddenly appeared in a hologram before the Didact.

"Didact, long range scanner has shown another galaxy that matches our Milky Way galaxy."

"That seems unlikely, scan again"

"Already done, after 100 different scans my previous statement remains valid."

"That cannot be possible."

"Didact, rough scans indicate the level of Hydrogen and Helium in this galaxy is a 97.5 percent match. Long range scanner detects similar number of stars and planets to Milky Way Galaxy.".

Iso-Didact sat in silence, but in reality his ancilla was currently communicating with the Life Shaper of the remaining Forerunner fleet, Chant to Green.

"Didact, what pleasure do I owe you?"

"You already know what is ahead, perhaps you can share your thoughts with me?"

"There are billions of galaxy in this universe, a galaxy that is similar to ours should not be uncommon."

"You are correct, but this one is an exact copy."

"That can be troubling, and what are you trying to suggest?"

"Precursors." This word weighs heavily in the mouth of the Didact.

"You lack evidence."

"It's a hypothesis."

"You should inform the council."

"Indeed, they will be interested indeed." And thus, the Iso-Didact rose from his seat and activated a slipspace portal, instantly teleporting him outside of the council chambers.

"The Ecumene Council is now in session under the call from the Iso-Didact. Didact you are now recognized."

"Councillors, our faithful ancilla Offensive Bias has just informed me of another galaxy ahead of our path. This galaxy is a similar copy of our Milky Way Galaxy, and thus I believe that it must be the meddling of the Precursors."

A great murmur began among the different councillors.

"Didact… speak your point please."

"Councillors, we now face two choices, continue our exile in intergalactic space, or find home in this galaxy, and warn other species in case the Flood ever touches this galaxy."

"Why should we meddle with this galaxy? The last time we meddled a galaxy had to suffer galactic scale genocide." The Master Builder known as Constructor of Stars raised against the Didact. Suddenly many councillors yelled "Aye!" to demonstrate their support in the Master Builder's views.

"The Council will let the Didact to finish his speech. Master Builder this will be your final warning."

"Councillors, we shall act not as the caretakers of the galaxy, but as a co-existing member of this Galaxy. Our knowledge of the flood can help any species from making the mistakes we made. This is a much better redemption for the lives that we have took than our continuous exile. We are not…"

"Council, urgent issue ahead." The baritone voice of Offensive Bias suddenly roamed inside the Council Chambers.

"Offensive Bias, you've just interrupted a council session, please tell us that there is something important or I will personally deactivate you." Shouted by the Master Juridical Eternal Unify of Justice.

"Councillors, long range scanners detected millions of unknown vessels. They are giving off unusual gravitational readings and are currently only ten light years away from our position."

"Offensive Bias, have you contacted them yet?"

"No Iso-Didact."

The Iso-Didact cleared his throat. "Ecumene Councillors, we are currently dealing with a first contact situation, I believe it is best that we communicate with this newfound race."

"Aye!" As the Council roared, indicating their support to the Didact's words.

"Councillors, as a matter of caution, I suggest we have the civilian ships take cover behind our naval vessels."

"Aye!" Again the Council roar in approval.

As the Iso-Didact assumed his power as the supreme commander of the Forerunner military, "Offensive Bias, contact the unknowns now."

"As you wish Didact."

…

"Didact, communications are clear"

"Greetings, I am Bornstellar Makes Eternal Lasting, leader of the Forerunners. We are here in a first contact situation, and I hope we come to a peaceful resolution."

Suddenly a deep voice boomed in the broadcast system of the Council Chambers.

"Organics… the chaos of this galaxy. For I am Harbinger, and I am the force of your destruction. We will harvest again to bring order to the galaxy. Know your doom is coming, for the Reapers are here."

The Council Chamber is filled with silence, except the communication static.

Systems Alliance

Admiral Hackett looks out the window of his flagship, the SSV Kilimanjaro. The SSV Kilimanjaro is the most sophisticated naval vessel ever created by the System Alliance navy, with a total of 156 broadside mass accelerator cannons each capable of launching a 20 kilogram slug to 1.3 percent of speed of light. If there is something call overpower firepower, then it would be the SSV Kilimanjaro.

"Admiral Hackett! Priority message from SSV Houston!" The Comms. Officer suddenly shouted, breaking Hackett's thought on the dreadnought.

'SSV Houston? Wasn't that assigned to the outer rim to detect and monitor Batarian movements?' Hackett's mind suddenly race to a conclusion: The Batarians will attack the Systems Alliance.

"Patch the Houston through!"

"Yes sir"

"SSV Houston, this is Admiral Hackett of SSV Kilimanjaro, what is this priority message you are sending to us?"

"Sir, it's… It's the REAPERS sir!"

"Repeat Houston are you affirmative?"

"100 percent sir, the whole Batarian forces are being decimated by the Reaper forces. Shit… They've found us… Admiral the Reapers are here! I repeat th-..."

The abrupt static caused a tense atmosphere to settle over the bridge of SSV Kilimanjaro.

"Someone patch me to Admiral Anderson."

"Yes sir."

"Admiral Hackett, I was just about to contact you."

"Anderson, we have a problem."

"Is it the Reapers? We've lost contact with a lot of our deep space probes… and all of our communication systems with Arcturus Station have been unsuccessful."

"Holy shit.. Shepard is right."

"I will go alert the Board of Council, and sir, permission to get Shepard out of that goddamn cage."

"Granted Anderson, I will alert the fleets. Hackett out."

'Shit.. if the Reapers nailed Arcturus Station then Earth is more or less doomed.' Hackett just couldn't imagine what state the Systems Alliance was in. It took the whole Alliance fleet to take out one Reaper Capital ship, and that was with over 30 percent casualties. 'If only the politicians listened to Shepherd's warning and actually contributed to the build up effort.'

"Sir! News from SSV Sevastopol!"

"Patch it through!"

"Sir yes sir."

Hackett almost guessed that is must be the news of the Reapers. However, Hackett grew a bit uneasy. The Sevastopol was a frigate that was sent to recover a malfunctioning probe in the region of intergalactic space. It is the back door of the System Alliance… unless...

"SSV Kilimanjaro do you read?" A deep Scottish accent chanted in the broadcast system.

"SSV Sevastopol this is Admiral Hackett of SSV Kilimanjaro copy."

"Sir, we've just sighted some derelict Reapers sir… no, change that to hundreds."

"Derelict Reapers… are they recent?"

"That's the issue sir, these Reapers appear to be destroyed a few moment before. But what is more amazing sir, is that some Reapers are all sliced clean half, and the rest all have some kind of direct penetration of its hull."

"What…"

"Sir, some of the Reapers are still burning… and we detected one ship remaining that's not a Reaper. It doesn't match to any profile of the Alliance Database, sir."

"Have you contact it yet Commander?"

"Yes sir, but it seemed to have failed… wait… hold a second, sir we just received a package!"

"Open it now Commander."

"Sir… it's a message form that ship… it's in perfect English!"

"Humans, we are Forerunners, and my name is Bornstellar Makes Eternal Lasting, commander of the Forerunner military. It seems that this galaxy faces the threat of the Reapers, and so do we. I hope that we can come together as allies during the time of crisis."

"Holy shit… sir this is a first contact scenario. Sir what should I do?" The Commander of the Sevastopol is now trembling is both fear and excitement.

"Commander, you orders are to contact them in the best bloody manner, and make sure we gain their support for our war against the Reapers."

"Sir yes sir, it will be done."

"Good, Hackett out."

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