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-50.80.96.33-20130222223106/@comment-1786741-20130222233743

You seem to forget even the smallest Forerunner military ship is more powerful than any Reaper weapon and has stronger shields, that is a fact. You keep forgetting that. The Reapers aren't a species, they're a malevolent synthetic amalgamation of organics that harvest other races. The mantle doesn't apply to them just like the mantle doesn't apply to the Flood. So yes, the Forerunners would instantly eradicate them. END OF STORY.