User blog comment:Darkcloud1111/The Rules of Death and The Son of Neptune/@comment-3146855-20110909004842

Once you die, the only natural way to come back is if you try for rebirth by taking a dip in the Lethe, and are reborn as a baby, with no recollection of your past life until you die and your soul returns to the Underworld. those in Tartarus and the Fields of Punishment cannot try for rebirth, and coming through the doors of death is just not natural and you don't come back completely.....human, as shown with Medea. Only the baddest of the bad are let through by gaia.