It states that when you are using a weapon of ancestry, you do critical effects when roll a critical.
Wouldn't that happen anyway? I am confused. What is the point of this feat?
Each weapon group has its own special bonus critical effect that you only get if you have an ability that says so. For example, swords make the target flat-footed on a crit, but only if you have a feature or feat that lets you use that bonus. This is in addition to the normal critical effect of dealing double damage.
These effects are listed after the weapon traits section in the equipment chapter.
I hope Paizo does a better job refencing these items in the future.
It would probably be help if they had a "data Dictionary" in one place.
I Guess I am another one of those old farts who was excited about the second edition, only to find it disappointing. Frustrating items like this are not helping.