User blog comment:Mlgrsd/How could Lucifer land in this dungeon?/@comment-1031724-20170218044521/@comment-146.198.136.113-20170218163642

Lucifer killed Gabriel with an ARCHANGEL blade. We don't know if angel blades can kill or even harm archangels, but I assume not, since Crowley has a gun with angel blade bullets, but he didn't even think of shooting Lucifer.