User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-50.53.164.184-20130328214721/@comment-99.28.82.2-20130329155103

What if it turns out that if you kill a monster in tartarus then it stays dead forever and never returns to the mortal world. That would be a sick revelation for the end of the series and it would also bring piece to all demigods that have been hunted by monsters for centuries.