It's a little confusing because the gravemind tells the Ur-didact in Silentium that the precursors want to put down their creations and prevent future rebellion, but then why were the humans spared? This doesn't really mesh with the whole test thing that the Primordial talked about in Primordium either. Maybe they're like the reapers and wipe out races that are beginning to become a threat in terms of tech level. I don't know.
English
-
No, the Precursors stopped attacking the humans in their flood form because the thought them worthy of becoming the keepers of the Mantle.