An expansion on this question: If I don't devote myself to an Elder Evil until later in life, after I meet many of the prereqs, do I still get the feats for my earlier levels? If so, can I use my current stats for qualifying for them? Or can I only consider what I had at the level I'm getting them for?
For example, I'm level 5, and decide to devote myself to an Elder Evil. Can I take Dark Speech for the bonus feat at level 1 (it requires a base Will save of +5, which I have now, but didn't at level 1)?