User blog comment:Fusedtwilight/Possible Season 11 Plots/@comment-81.217.115.199-20150522185429/@comment-71.148.35.145-20151025003829

Metatron** is a human now, he lost his grace after Castiel cut it out of his throat. The ange tablet is also destroyed, Castiel took care of it, so the angels could capture Metatron and throw him in Heavens prision. As far as the bunker goes most likely the darkness can enter it, as even the men of letters didnt know about the darkness only, the archangels and death along with God knew of the existance. Hope this helps.