Being new here I do not know if this topic has been touched or not, however, I'm curious as if the Pathfinder Unread and those beings like (the original) Shades that cost their souls for immortality, should not be able to progress in Level or Hit Dice, as was the case in first and second edition AD&D?
That does not mean of course, there cannot be a way not to do so -- save a powerful rite that allows for such a progression but at as say cost of lives and money to achieve such a goal(a goal making it of interesting adventure potential to say the least, for all parties involved)?
