Hmmm that would DEFINITELY solve all my problems.

But thinking here, there are feats like 'taint resistant' which grants you +4 bonus to your fortitude check in order to avoid the taint, or prestige class abilities such as the tattoed monk stuff which increases your resistance to taint, some crab feats too etc. And this one feat 'pure soul' would simply overcome all that stuff, everyone would get it and no one would use all the other stuff, so I guess it looks broken to me.

However, I do agree that the Shadowlands are a horror setting, no doubt about that! But the feat is so powerful (stopping you from ever getting the taint) that the DM will never allow, hahaha. I guess he wants us to feel the horror and how we deal with it.

I think I need some more mild and 'diplomatic' solutions lol but thanks a lot for the input anyway, this seems like a fun material to look into