Forerunner-Flood war

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"Every vessel we can fill, we send to the Ark. I dare not cease the mission. Not now, not until I've done all I can. Each one of these souls is finite and precious. And I'm close. Close to saving them all."

— Forerunner Librarian to Didact

The Forerunner-Flood War was a galactic war between the Forerunners and the Flood believed to have started in 98,379 BC and definitively ended at 97,448 BC. The war was on a huge scale, millions of times larger than the Flood-Human-Covenant war ever was.

Introduction

The Forerunners originally evolved in and colonized the Milky Way galaxy, organizing themselves over a large number of terrestrial planets and colonizing multiple worlds, as well as forming a structured military which included both naval elements and ground forces. The Forerunners were of sufficient technological capability to construct super luminary vessels, create sophisticated artificial intelligences and set up massive super weapon networks. They measured their advancements in Technological Achievement Tiers.

At some point during their development, the Flood were discovered to have entered the galaxy from an an undetermined extragalactic point of origin, contesting the Forerunners for control of the galaxy. While the Flood sought to assimilate all sentient life, the Forerunners attempted to defend against the Flood threat using several measures to both directly combat them as well as carry out research in regards to their capabilities. As time progressed, they also began to develop and create super weaponry, specifically the Halo Array. As a method of countering the total elimination of all sentient species (the result of triggering the Halos), they began indexing and protecting them from Flood assimilation out of the noble ends to defend all sentient or pre-sentient galactic life.

Beginning

The Flood entered the Milky Way galaxy at approximately 98,379 BC, and initially caught the Forerunner military by surprise at G617 g1, using captured non-military vessels to penetrate local Forerunner naval blockades to descend and land upon Forerunner-colonized worlds, overrunning local defenses and converting billions of Forerunners per world with hundreds of millions of Flood forms within a few years. Eventually, Forerunner fleets were forced to bombard Flood-infested worlds to prevent the Flood's spread.

Stalemate

Following the 300 years of devastating warfare between the Flood and the Forerunners, the highest levels and tiers of the Forerunner Fleet Command began to realize that Forerunner species extinction was plausible at the Flood's disposal as so many Forerunners had fallen victim to the Flood. After Flood spreading continued, planetary self-bombardment after Flood infestation turned into complete system-wide destruction by detonating planetary system stars after a large Flood presence was detected in a Forerunner system. Forerunner military forces were ordered to don heavy armor and other personnel were ordered into protective stasis. Flood were taken into M-type Forerunner installations and studied in an effort to find yet another countermeasure.

Hundreds of other unsuccessful methods were attempted by the Forerunners to overcome the Flood, and all possibilities were exhausted as a final countermeasure came into mind for the Forerunners: activation of the Halo Array and destruction of all sentient life in the galaxy, depleting the Flood of all biomass that they could consume, thus halting them. However, Didact, a high-ranking military leader, adamantly refused to activate the Halos, saying that it would overturn the Forerunner pledge to preserve all life in the galaxy.

However, the Flood were growing in number, and were forming a centralized sentient intelligence to coordinate their efforts; Gravemind, and their "raw computing power" began to overrun the last Forerunner naval countermeasures, which consisted of using Keyship vessels and drawing the Flood into pricey naval engagements which lasted for approximately 300 years. However, even Forerunner commanders realized that their naval tactics were being overcome, and a new solution was necessary if the Forerunners were to pull of out this "stalemate"; a Contender-class artificial intelligence, Mendicant Bias, was crafted by the Forerunners to directly attack the Gravemind forms and any surrounding Flood biomass in an effort to decapitate Flood consciousness. Two installations, the Ark and the Shield World, were constructed by the Forerunners for shelters for themselves when the Halos fired.

While there was the Maginot Line where the Forerunners held the Flood at bay, the Forerunner Librarian journeyed beyond this line at great personal risk, indexing and documenting sentient species across the galaxy, including the Sangheili and San 'Shyuum, filling every vessel possible with documented species for transit to the Ark for safety in the campaign to save all species possible from the advancing Flood.

Endgame

"Something is wrong...at night I can see it--flitting shadows--black against the stars. Thousands of ships! Not spiraling outward, but heading for the line! This is the tipping point, Didact. It's no longer feeding."

— Librarian to the Didact

While during the stalemate the Flood was exponentially growing and readying for an attack, and eventually they assaulted the Forerunner core systems with thousands of Flood-filled super luminary vessels. While three Forerunner naval groups, the Emergency Circumstance Fleet, Security Fleet, and Suppression Fleet, were recalled to defend against the Flood attack, Mendicant Bias became rampant and instead of attacking the Gravemind, turned against the Forerunners for the Flood cause.

With naval strategies failing, the Forerunners turned to their Halo project; securing other species into the Ark while readying the Halo array for firing. Upon this, two Forerunner units beyond the failing defense line, the Primary Pioneer Group and Advance Survey Team-Alpha, came across Earth at the edge of the Milky Way galaxy. The Librarian journeyed there in its quest for categorization, finding the human species and also creating a Portal on Earth that would lead to the Ark. The Forerunners saw a unique potential in the human species, creating a "Conservation Measure" for the protection of the human species, protecting them with the Ark.

The Didact sent a rescue party for the Librarian, in an effort to retrieve it from the Ark before it would be forced to activate the Halos and kill all sentient beings, but Mendicant Bias destroyed the rescue party, leaving the Librarian stranded on Earth apart from the Ark. Forerunner military collapse forced the Didact to activate the Halos. Mendicant Bias attempted to prevent the Didact from doing as so, but was stopped by a Forerunner-loyal artificial intelligence, Offensive Bias.

While the Didact began the activation sequence for the Array, the Flood fleet attacked, and the remnants of the Forerunner fleet formed a spherical defensive formation while the Array activated, using feint tactics to hold off the Flood fleet as the Halos activated, annihilating all sentient life in the Milky Way galaxy save those sheltered in the Ark. The Forerunners were believed to be extinguished from the galaxy, and the Flood were halted, and the centralized Gravemind form was destroyed.

Millions of years later a war between the human race and the covanet a alein race who only want power and the existion of the human race. Would wake the flood from its deep slomber causeing the once dead gravemind to try to over take the galaxy once againe.But with the forrunners gone. hope seemed lost for all living life forms until a solder said to be the last of his kind, a super solder named John or his name he was known by Spartan 117, Master cheif. after the battle of Reach which had said to have been the last base the super solders had. Until a single ship called the Pillier of Attium had managed to escape the battle and save Master chief who was in a cryo tube. When it had seemed that they had esacpe the battle they were then followed by covent battle ships. Master cheif was then awaken to help fight the covanet.There he was given the resondsabile of defending a artafishal intellagents know as cortana. After fighting a hard battle the crew as well as master cheif had to abanden ship on a ring like object.

There on the groud master cheif and the rest of the human surviers fought on the surface of this strange ring. Though out numbered cheif and the human resticet hand given a damn good fight until a group of solders where sent in to take care of a covanet research area. the team was not heard from so cheif was sent in to see what may have happended after decding into the facility he had found that there was a battle taken place here because of the blood but he still didnt understand where were the bodys after going further into the base he had found a helmet and us the the recoding system to see just what had happend. To his horror he found out that his team,the covanet grards where killed by a parasit like being( the flood ) he then was attacked by the parasites managing to escape to find out the flood was every where and was meeted by a muichine like being know as the orical by the covanet there master cheif was taught about halo and was going to use it until cortana had told him that halo would destory all life but stop the flood insted of fireing the halo ring cheif had overloaded halos seystem and desteroyed halo and was able to escape the blast. But somthing else got off as well...........