97,495 BCE

In 100,043 B.C.E. (approx.) the Forerunners sent 032 Mendicant Bias to combat the Flood threat and Gravemind. Mendicant Bias would eventually turn against his makers and fight for the Gravemind.

At the same time the Librarian returns to Earth to index the human species. The entire species is removed from the surface of the planet and held on the Ark.