User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5938567-20130113181814/@comment-3146930-20130113182253

Percy, Nico, Annabeth, Thalia, and anyone in Percy Jackson and the Olympians have plot armor, so the odds of them dying is slim to none. I'd be more worried about the new characters introduced in The Heroes of Olympus.