Sapient-Necrotic War

The Sapient-Necrotic War was a long and deadly war between the Flood and the Necromorphs (Necrotics) and the Forerunners, Engineers, and Ancient Humanity (Sapients). It was a massively spanning inter-universal war originally starting as a local galactic conflict between ancient humanity and the Flood and Necromorphs.

The war began 900,000 years ago and lasted 100,000 years ago (and promptly ended at that time) as a continuation of the specicide carried out by the Forerunners and the Engineers against the Precursors, with the Precursors launching the war using the Flood and the Necromorphs as revenge against their creations for destroying them.

## Background

900,000 years ago prior to the events of the series, two sapient humanoid species (known as the Forerunners and the Enginneers) gained technological prowess and spread across the universe, alongside ancient humanity. The Precursors, a species of gods who aided the evolution of sapient life across the multiverse, decided to give the mantle of responsibility (their status as gods and custodians of the universe) to the Forerunners and the Engineers. There was a heavy debate and a brief war regarding which species should gain the status.

Because of their competitive status as owners of the mantle, the Forerunners and the Engineers declared war on each other and proceeded massacred the opposing sides, suffering heavy losses and casualties on both sides. The gruesome atrocities and sheer scale of the conflict disgusted the Precursors heavily, to the point that they saw both the Forerunners and the Engineers as unfit to gain the claim of the mantle, and instead decided to give the mantle to humanity. This angered the Forerunners and the Engineers, who decided to agree to a ceasefire and instead targeted their humble creators, the Precursors.

The two species immediately launched a full scale surprise attack and uprising that quickly devolved into a full on specicide. The Precursors, far from accepting their extinction, transmuted themselves into pure energy such as dust. This dust was kept safely contained in massive ships that was bound for their homeworld, FMM UV-32. However, their ship was caught off course when it was discovered by ancient human astronauts patrolling their territory on a security scouting mission.

The humans brought this powder to their capital world, they tested the powder on their pets. The initial tests showed positive results, with the subjects becoming faster, stronger, more intelligent, and generally more cooperative. However, later generations descended from the first test subjects would become noticeably different and be distinguished by missing skin and body parts, aggressive behavior, and social hunting. These infections would later jump species and spread to humans, directly infecting them and spreading across human worlds. And thus the Flood and the Necromorphs, whilst still in an early state of their existence, were born. They took on many different forms from their hosts and infected any organisms they could find whilst absorbing natural biomass and spreading their own biomass. Eventually, humanity was left to flee their worlds and came directly into conflict with the Forerunners and the Engineers due to the latter species perceiving humanity as intruding upon their territory. However, humanity was one of the many Tier-1 species enlisted by the Engineers and the Foreunners as allies to fight against the Necrotics once they began to spread to their worlds.

## War

The Flood and the Necromorphs began to spread across Forerunner and Engineer dominated worlds, infesting them and assimilating them into their ever expanding hive mind. The Necrotics invaded and controlled vehicles such as ships to leave infested worlds and infect new worlds to spread themselves. Much like their human enemies, the Sapients were forced to destroy worlds invaded by the parasites, using orbital bombardment to glass their former colonies in an effort to prevent them from escaping and spreading.

The Necrotics grew massively in number and size, eventually forming a massive central intelligence known as the Deathmind, formed from the fusing of the Gravemind and the Hivemind. The Hivemind began formating plans to further infect more worlds, and possibly even universes via escaping the current universe once all life forms were assimilated.

## Aftermath

Eventually at some point, the Flood and the Necromorphs spread far and wide enough that nothing could stop them, and the Forerunners and Engineers had become overwhelmed by their sheer numbers to the point of near extinction. The two species decided to build halo rings, the only weapons powerful enough to stop the parasites. The halos would eliminate all life in unprotected worlds, disintegrating any and all life forms as well as the pests. The rings were activated, killing countless species but cleansing many worlds at the same time of the Necrotics.

## Belligerents

* Humanity
* Forerunners
* Engineers
* Flood
* Necromorphs

### Units

* Attack Drone
* Defense Unit
* Enforcer
* Scout
* Promethean Knight
* Promethean Watcher
* Promethean Crawler
* Sentinel
* Armiger
* Cavalier
* Packmaster

## Casualties

### Death toll

Untold trillions, possibly zillions of individuals, thousands of species, billions of worlds.

### Species

* Forerunner
* Engineer
* Humanity
* Mondoshawan
* Chozo
* Xalanyn
* Qu
* Architect
* Prothean
* Targyll
* Monomen
* Builder
* Ring Builder
* Uvodni
* Nomai
* Heptapod
* Asgardian
* Arisian
* Anquieta
* Promethean (Rifts)
* Keelbug