Human-Forerunner war

The Human-Forerunner War was a major interstellar conflict fought approximately in 110,000 B.C. in the Orion arm of the Milky Way galaxy. Ironically, this is the first recorded war in Human history, and was fought against overwhelming fleets and armies of the Forerunners.

Aftermath

For unknown reasons, the victorious Forerunners decided to dismantle every piece of pre-historic human civilization, causing the species to devolve on their own. Because of this cataclysmic event, various human subspecies appeared, including the Florians. This was noted as being a "punishment" by a Forerunner Miner, Bornstellar Makes Eternal Lasting ten thousand years later.

List of appearances
Halo Cryptum