If you increase one of your base stats such that you now meet the ability score prequisites of a feat, can you respec an existing feat from an earlier level to take that new feat?
For example, I currently have a level 14 character with enough xp to take 15. I want to take Imp TWF but my base Dex is 16; Imp TWF requires Dex 17.
If I take a different feat at level 15 and then increase my Dex later (with a tome for example), will I then be able to respec the feat I took at 15 with Imp TWF?
Thanks!