Prestige Classes that Add Int to AC

[Ogrork the Mighty]

The Invisible Blade prestige class (Complete Warrior) has an Unfettered Defense ability that allows you to add your Int bonus to AC (unnamed) so long as you are not wearing armor and are armed only with daggers.

The Duelist prestige class (DMG) has the Canny Defense ability (below) that seems to do the same thing.

Canny Defense (Ex): When not wearing armor or using a shield, a duelist adds 1 point of Intelligence bonus (if any) per duelist class level to her Dexterity bonus to modify Armor Class while wielding a melee weapon. If a duelist is caught flat-footed or otherwise denied her Dexterity bonus, she also loses this bonus.

The question is, do they stack?

 

[Dandu]

One counts as a Dex bonus, the other as an unnamed bonus.

Don't do it.

 

[Jhaelen]

The question is, do they stack?

Most probably not.

The same question has been asked about the Monk and the Swordsage who both get a Wisdom bonus to their AC. It has been clarified that it doesn't stack.

 

[Dandu]

Monk and Swordsage add Wis as the same type of bonus. That does not seem to be the case here.

 

[Seppuku]

So we have the Monk, Swordsage, Ninja, Duelist and Invisibile Blade. Any others that stack a different Ability Mod onto the DEX for AC or add an unnammed bonus?

 

[milo]

Fist of the Forest adds con, if you take the Ascetic Mage feat you get to use you charisma instead of wis for ac(and other monk abilities).

 

[StreamOfTheSky]

They should stack, and I agree with Dandu, don't do it. Armor is so much better, and Invisible Blade limits it to class level, ie max of 5. And both Duelist and IB are freaking awful classes to begin with, and you REALLY don't want to slog through 7 levels of Duelist in particular...

If you absolutely must get int to AC, either do a monk dip with wizard with Carmendine Monk or Kung Fu Genius feat, or be a Factotum, which adds Int to AC at level 16, and prior to that has the option of adding it against a single attack for 1 inspiration point (a very bad deal, IMO, but it's there...).