so recently, 343i revealed Silentium, the newest, and last, book in the Forerunner Trilogy by Greg Bear. and here’s the plot of Silentium:
Now, in the last years of the Forerunner empire, chaos rules. The Flood—a horrifying shape-changing parasite—has arrived in force, <mark>aided by unexpected allies</mark>. Internal strife within the ecumene has desperately weakened Forerunner defenses.
Only the <mark>Ur-Didact and the Librarian</mark>—a husband and wife pushed into desperate conflict—hold the keys to salvation. Facing the consequences of a mythic tragedy, <mark>one of them must now commit the greatest atrocity of all time—to prevent an unmatched evil from dominating the entire universe.</mark>
anyways, we all know (people that paid attention to Halo’s story) that the Didact “commits the greatest atrocity of all time-to prevent an unmatched evil from dominating the entire galaxy” by activating Halo. the Flood is “aided by unexpected allies”. Allies. sorry, if I’m not mistaken, but Didact is only one person, not multiple; neither is Faber. so that leaves only one answer: the Precursors.
Either this is right… or I’m high and I’m completely missing something…
EDIT: I guess this is not entirely proof. however, “unexpected allies” can’t mean the Didact (there was two, but even then, it says “allies” and if one Didact is helping and the other isn’t, that’s still only one “ally”, and even then if I remember, there is only 1 Didact, the Bornstellar one as the original died), Faber, Medicant Bias, or any one person.
while allies can mean anything, the highest pointing of fingers are the Precursors, as in Primordium, multiple Precursors exist and are the ones that created them and are also the only ones that would help the Flood (who/or better, multiple whos, would be in their crazy minds to help the Flood; again Medicant Bias is only one). while Promethean AIs are high candidates as they are multiple and could’ve been deceived by a/mulitple Precursor(s) and are now rampant, that could explain why they are attacking us in Halo 4.
however, this theory could be proven wrong as Flood “allies” may have nothing to do with the Ancient Evil at all in Halo 4 and just add story to Silentium.