So, I’m just trying to make sense over the events in the Forerunner Saga, and the larger HALO Universe. Perhaps you’ll bear with me and find something entertaining;
“Plans within Plans within Plans”. If anything can easily summarize the HALO Universe, it is this key phrase. I’ve read Cryptum & Primordium again to try and comprehend some of the implications, debates about outright lies, and then the perspective of hindsight on these major events, and I’ve come to one conclusion; EVERYTHING is the Forerunners fault. The Precursors, also known as the Originals, came to our galaxy and seeded it with life.
Again and again, they terminated entire civilizations that failed to uphold their strict code of morals, which the Forerunners would come to dub the Mantle. The Precursors sought a galaxy built on the fundamentals of peace and prosperity, but failed to find that in their creations. Until they created the Forerunners, and their sibling; Humanity. The Forerunners quickly advanced, their jumps in science and technology nearly rivaled the power that their Precursor “gods” possessed.
And, for a fleeting moment, the Precursors thought it might be the Forerunners who could unite the Milky Way galaxy in peace. But the Forerunners wanted submission from the other races, not equality. They believed peace could only be achieved through force and strength. Any species who opposed the Forerunners, opposed the Mantle, and were swiftly struck down, devolved, or utterly destroyed.
This angered the Precursors, and the decision was made that this galaxy would not be left to the Forerunners, instead, they would be wiped clean, and Humanity would claim the Mantle. But when the Forerunners realized the Precursors intended to erase them, they instead would make war, and erase their creators, who they believed had defied the Mantle. But, like everything else in the universe, life goes on, and a select few Precursors escaped, and creation continued in another galaxy.
This was the horrible truth that so many humans were privy to, when the Last Precursor, The Primordial, was brought to Charum Hakkor, he revealed to them the origins of the Flood, and the transcendence his race had found; when the remaining Precursors fled, and creation continued, they realized the frailty of the universe, and what the Mantle truly represented.
In these moments of experimentation, The Flood was born, their Answer to the Mantle. The Precursors bonded with the Flood and finally, they were Transsentient. This was the peace, the unity and quiet wisdom the entire universe required. Whether the galaxy would succumb, or struggle and unite together to combat the Flood, either way, peace and unity. Now the Precursors slumber, when one dies, another is awakened, to continue the cycle, and keep the Flood alive. So that humanity, when they are ripe, will finally be tested by the Precursors.
When the Forerunners eradicated Humanity, devolved them and locked them away on Earth, the Precursors realized it was not humanity that should yet be judged, but the Forerunners time to come to an end, so that Humanity might one day be tested.