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-50.80.96.33-20130112033616/@comment-3228423-20130112035055

The Forerunners were masters of the galaxy, able to control the dimensions themselves and forge stars like its a mere hobby. The closest anyone has come to the sheer destructive power of their weaponry are the UNSC's NOVA nukes. One of those alone should be sufficient enough to destroy the entire Reaper fleet if positioned correctly