Board Thread:Warhammer 40k General Discussion/@comment-25618639-20150118044502/@comment-25177957-20150124073639

Possibly, and in truth, Terra is already doomed to be taken over by Daemons and the Warp at some point. When the Emperor dies without an extremely powerful psyker at the level of him, Magnus, or Malcador, then the Astronomican will go out and the portal into the Imperial Palace left there after the failed Imperial webway project will open and let all Daemons waiting in. There would be no way to stop the Daemon hordes pouring out of the portal since they've been waiting since the Emperor sat upon the Golden Throne. Not even 10,000 Grey Knights could stop a Daemonic incursion of such a sort.