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-50.80.96.33-20130129234750/@comment-1683193-20130130055552

Reaper weapons are 430 kilotons per shot,the Mantles approach tanked over a hundred teratons of firepower. If they try to land on the surface they'll be blocked by hard light shields.