What is the worldwound affinity?

[Shivok]

What is the worldwound affinity, and in what book is it located.

[Karui Kage]

Pathfinder Campaign Setting. Every 'region' has a unique feat that requires affinity (well most do) in that region to qualify for it. The Worldwound is one such region. Affinity basically means that you've lived there, were born there, or you otherwise know that area better than any other.