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At 13th level the wind oracle who has Air Barrier (Ex) has it give him a 50% miss chance from arrows, rays, and other ranged attacks that require an attack against the wind oracle.
So my question is if the wind oracle also wears a cloak of displacement minor, which gives it's wearer a 20% miss chance like as if blur was on the wearer, then do the two affects stack?
The reason I'm asking this is because I think the the Air Barrier is like churning air that swats the range attacks so they miss, while the blur affect from the cloak makes the wearer blurry so he is harder to hit.
Effects that give miss chances usually don't stack, but I can't find a particular rule that says one way or another.
Vortex Spells requires an attack roll. Any spell with an attack roll will work, so rays, ranged touch, or melee touch. That ability isn't very good unless you combine it with something that gives you better critical range on the spells.
I was wondering because the cloak gives a magical affect, while the wind oracle ability is non-magical, since it's an (EX) ability.
The magical/non-magical distinction means very little, and certainly doesn't effect whether things stack.
Some miss chances are due to concealment or total concealment, and you can only have one miss chance from concealment.
But there aren't any rules about non-concealment miss chances like the Wind ability, the Entropic Shield spell or anything else. The percentages wouldn't stack, though, you would check each miss chance separately.
Doesn't it say in the Entropic Shield spell that it's similar to the affects of concealment so would that spell fall under concealment?
As I read it, it very explicitly deflects attacks, and then says that the miss chance mechanic used is similar to how concealment works, but it isn't in any way concealment.
Vortex Spells is only good if you got it through dipping oracle as a magus, who often crits with spells.