Quote Originally Posted by tonberrian View Post
Okay, the damage reduction mutation is weird. It doesn't allow you to progress any damage reduction except those pierced by magic, which means most racial DR simply can't be enhanced by it. (A particularly stupid DM might not even allow you to progress the DR granted by it once you have one of the mutations that adds an additional qualifier to it, because by technicality that means that it's no longer pierced by just magic.) Also, it can only progress one type of DR at a time, so if you end up with different types of DR from race, class, feats, what have you, you only get to enhance one.

I'd suggest something that gives you DR/Magic, or increases all your DR that is defeated by something (ie. not DR/-) by 3 should you already have damage reduction. The improved DR mutation in the Elemental section is fine.
I have just added a huge special entry to adress this.

Blargh.