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> > > > > There are several points full of mystery in the Halo Universe, but the biggest one is “Who is the Primordial? He is a Gravemind or a Precursor?”
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> > > > That’s talked about in the Forerunner Trilogy, isn’t it? If not, then thats a question good for a future game, not really a short story. If Cortana is being controlled by the Primordial in Halo 5, then revealing it with some narration in the next Halo would solve that…
> Mmh ok, not sure about that. However, what about the Flood? Did it form from Precursors’ dust, and it was a failure of their coming back, or did Precursors create it as a test?
The former. When the Precursor’s exiled themselves from the galaxy at the end of the Forerunner-Precursor war, the remaining Precursors dismantled themselves into biological dust, and put themselves on a starship full of canisters of themselves (the dust). Their plan was that they’d reshape themselves back into what they were a millennia or so later to see what the state of the Galaxy was at that time, and whenever the time seemed fit, they’d attempt to take back what was rightfully theirs (from their perspective), since they felt betrayed by their own creations and decided to hold the Mantle to themselves rather than let anyone have it.
However, over time, the dust degraded, perhaps due to natural causes, or the Precursor’s themselves modifying themselves to become even more dangerous. Either way, the dust became stale and dormant. Then, at around 107,445 BCE, Ancient Humanity stumbled upon this starship and discovered the dust within stored in all the canisters. Not knowing what it was, and curious too, they took it back to Charuum Hakkor to study it’s features. They discovered it was biological, and presumably harmless.
To see its biological affects, they injected the dust into their pets, the Pheru, and found positive results, such as more beauty and positive behavior. But, over time, say a few centuries, the Pheru begin to show external mutations and cannibalism. Then growths appear on the Pheru, and so on. Thus the Flood was born. The “disease” carried over to Humanity and their San 'Shyuum allies and waged war across their alliance. All of this is explained in the Forerunner Saga.