- RKOSNAKE
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- Exalted Legendary Member
"I may not be perfect, but always been true."
There's no confirmation, other than they arrived from another galaxy in the form of powder jars in a ship. The ancient humans didn't know what it was and so, applied them to their pets and then they all went crazy (the pets).
Humans began to fight the flood and had to move closer and closer to Forerunner space (I am not sure on the last part, they could have attacked or moved closer to them or something like that), the Forerunners thought that it was a signal for war and began to fight the Humans. The humans had to fight both the Flood and the Forerunner and somehow they found a cure for the Flood, driving them away before being de-evolved by the Forerunners.
Some time passed and then the whole Flood returned and attacked the Forerunners story happened, the only difference was that they didn't have any way to get the cure since they de-evolved the humans back to cavemen status and so, they were unable to win.
And that's how Space AIDS finished with the Forerunner empire and how we came to be cavemen.