| Faemeister |
Compared to a potion of Barkskin, a Stone-Body Mutagen gives you a lot of resistance to slashing and piercing but not bludgeoning, so you're out of luck there.
Maybe not what you're looking for since it's pretty specific, but for bludgeoning Hide armor does the trick with its armor specialization effect. It's the only piece of armor in the game that resists bludgeoning, since all other armor in the leather group is light armor. This gives you 1 plus your armor's potency rune value as DR.
This probably isn't what you need, either, but there's also stuff like the reinforced surcoat and Chain's armor group specialization effect, which don't exactly provide DR against bludgeoning but help protect you from all critical strikes. Amusingly they can be stacked together, so the chain armor group reduces damage from crits by 4 plus your armor's potency value, with an extra +2 if you're also using the surcoat. (In case you're wondering, no, there isn't any heavy Chain armor in the game either).
| Faemeister |
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Yeah, that's why I mention it might not be OP's cup of tea. Impossible to tell without specifics, so I just threw 'em there.
Apart from Champion and Fighter, there's also the Sentinel archetype; it's a pretty affordable way of getting both a better armor proficiency (the dedication itself) and its armor specialization effect via the Armor Specialist feat at 6th level, which is one level earlier than even Champ. It works out well for both martials and casters if you plan around it, and if you're getting Sentinel to nab heavy armor then there's also Mighty Bulwark, which kicks ass.