User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-16219425-20130220140807/@comment-122.167.17.78-20130220164105

Ummm Percy, Annabeth and Leo certainly cannot die 100%. Jason or Piper can die although they won't make much difference. I cant say about Hazel or Frank. Nico's sacrifice would shock Percy badly. As for fighting with each other, Jason and Percy may get into a power tussle. Leo would be completly unaffected.