User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5938567-20130113181814/@comment-4531192-20130113194209

I wouldn't go as far as to saying that they all have "plot armor," as not all of them are important to the story, and moreover, their roles have already been fulfilled. Yes, someone like Nico will probably not die, but characters like Chiron, Clarisse, etc. can die just as likely as Frank or Dakota.