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-2250460-20121114194727/@comment-5020188-20130107221454

Imperium of Man is the only real winner here. The imperium has held of dozens of other species for thousands of years, and only a few of these would be challenging.