I've been looking at the Banishment subschool for a possible wizard build. The 8th level ability is an Aura of Banishment, which banishes any Called or Summoned outsider after two failed will saves. Now, he's probably going to be adventuring in the Worldwound a fair amount, which got me thinking: what, exactly, is the Worldwound? Is it one, enormous, permanent Gate (in which case it's a Calling effect)? Is it an area where one is subject to random Plane Shifts from the Abyss to the Material Plane (making it Teleportation)? Or is it an area where the Abyss and the Material Plane actually physically overlap? The last seems the most likely to me, but I have no idea what would be considered. Any thoughts?