Introduction
The Delicious Pain feat offers temporary resistance to weapon damage types, but the mechanism is odd, and you only get to use it once per rest, so it may not feel impactful even if you’re using it regularly.
Ability Score Increase
Anything! Perfect.
Toughened Flesh
Great if you’re drawing a lot of attacks, especially if you expect those attacks to hit. This could be useful on melee martial characters with middling AC (two-handed weapon users, mostly), but remember that it doesn’t apply to the attack which triggers the Reaction.
