When unarmored and unencumbered, the monk adds his Wisdom bonus (if any) to his AC and his CMD. In addition, a monk gains a +1 bonus to AC and CMD at 4th level. This bonus increases by 1 for every four monk levels thereafter, up to a maximum of +5 at 20th level.
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Nope, they wouldn't stack. Both are untyped Charisma to CMD (even without the AC Bonus ability spelling out that it's added to CMD).
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To any other posters, bear in mind that Undead use their Charisma for all effects related to Constitution.
I would assume that they do stack because they are untyped.
The important aspect of bonus types is that two bonuses of the same type don’t generally stack. With the exception of dodge bonuses, most circumstance bonuses, and racial bonuses, only the better bonus of a given type works. Bonuses without a type always stack, unless they are from the same source.
Oddly enough, I'm pretty sure they stack because they are technically from two sources, charisma and constitution.
@LordKailas
Here's a relevant FAQ. The two bonuses are from the same source, which is Charisma.
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@VoodistMonk
Undead creatures have no constitution score. I remembered incorrectly that they use their Charisma instead of Constitution for all purposes, but it's more restrictive than that.
No Constitution score. Undead use their Charisma score in place of their Constitution score when calculating hit points, Fortitude saves, and any special ability that relies on Constitution (such as when calculating a breath weapon’s DC).
Since we're neither calculating hit points, Fortitude saves, or deciding the DC for a special ability, undead would not use their Charisma score in place of their Constitution.
What this means is that the Bastion ability does nothing for undead, as they have no Constitution bonus, making the whole stacking question moot.
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@LordKailas
Here's a relevant FAQ. The two bonuses are from the same source, which is Charisma.
Interesting, I would of figured they would be considered different sources since they come from different abilities and that the fact that they happen to be based on the same stat to determine what that bonus is, would be irrelevant. Certainly a good thing to know.
As for bastion not working because they are undead, I'm not sure about that. The main part states that you use charisma in place of constitution for any special ability that relies on Constitution. So, unless extraordinary abilities don't count as "special abilities" you would still get to use charisma in place of constitution. The breath weapon DC is merely an example, instead of a specification that it only applies when calculating special ability DCs.
That being said, I agree that as per the FAQ you linked, the CMD portion of the two abilities would overlap instead of stacking.
No Constitution score. Undead use their Charisma score in place of their Constitution score when calculating hit points, Fortitude saves, and any special ability that relies on Constitution (such as when calculating a breath weapon’s DC).Since we're neither calculating hit points, Fortitude saves, or deciding the DC for a special ability, undead would not use their Charisma score in place of their Constitution.
Reread the quote. It's used when calculating "any special ability that relies on Constitution", with breath weapon DC being used as an example. Any special ability relying on Constitution is calculated with Charisma instead, not just DCs. Bastion (Ex) is a special ability. Ergo, it uses Charisma.
Still doesn't stack, though, because Paizo nixed double stat bonuses by bending the words "same source" into a pretzel shape.
I figured as much. But I reasoned that if I'm right, then it wouldn't matter. And if I were wrong, it wouldn't affect the answer to the question either and I'd get corrected.
What made me uncertain was that the paragraph called out "special" abilities, and not just abilities.