Halo 4: Return of the Forerunners
See how 343i brought the new enemy class, Prometheans to Halo 4. There are still more back story questions to be answered about the Prometheans but you can get
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See how 343i brought the new enemy class, Prometheans to Halo 4. There are still more back story questions to be answered about the Prometheans but you can get some clues by reading Halo: Cryptum and Halo: Primordium by Greg Bear.
Check out this cool Return of the Forerunners video.