User blog comment:James12708/Reapers VS. Forerunners VS. Angels from Darksiders VS. Humanity from Halo VS. Council and humanity from Mass Effect VS. Imperium of Man/@comment-4721065-20130112104250/@comment-1683193-20130113125506

Feral Orks probalby wont be much of a threat to Ecumene ground forces though.

As for Chaos, we know absolutely nothing about how warp sensitive the Forerunners are, so we don't how they'd be affected.