I am trying to make a resilient anthromorphic badger race that has an naturally increased unarmored defense of 12 + Dexterity + Constitution. My current modifiers are:

Modifier to add Con to bonus:
Modifier Type > Set
Modifier Subtype > Unarmored Armor Class
Ability Score > CON

Modifier to increase the natural armor that uses the Dexterity ability from 10 to 12
Modifier Type > Set
Modifier Subtype > Unarmored Armor Class
Fixed Value > 2

What am I doing wrong?

Try this:

• Modifier: Set->Subtype: Unarmored Armor Class->Ability: Con->Fixed Value: 2

Thanks for the advise. I actually changed the modifier type to bonus on the DEX modifier hoping that would work and it didn't (well it did but I didn't realize I had to wait a while). Then I left it as it was and the next day it was working as intended. I then found out that it takes a while for homebrew stuff to update (facepalm). I'll make sure to take an hour break next time I'm having issues! Also, your way seems like it might actually be a cleaner way to do it, but it works right now and I have a player using it, so I don't want to risk changing it.

Thanks again for the advice!

Happy to help.

If you’re at all interested in the differences between what the Set Modifier does in this instance compared to the Bonus Modifier, and how they interact, and why it likely wasn’t working before, please refer to the Homebrew Subclasses & Species FAQ #9.