I`m trying to exchange mithral body, selected as an arti class feat at level 8, to no avail. It is in the list when i talk to Fred, but if I select it, no new feat can be selected to replace it with. All others "old" feats, including other class feats taken at previous and later levels, have no problem... is this WAI? Once you select mithral body it is for good? Hmm... sounds weird. A lesser reincarnation should work, right?