Hey, so my friend is wanting to throw rocks through an arrow slit. He wants to get all the bonuses that improved cover will give him and I think he is also has concealment. This sounds very sketch but here is the situation:
He wants to make a 5ft x 5ft box made out of wood for 10 copper. He is a male human so he is medium size in this box. He is also going to make an arrow slit in the box for whatever size for throwing rocks of whatever size that will fit through the arrow slit.
Now I'm thinking there's obviously going to be penalties to doing this. I'm pretty sure there's a DC check for whatever size the arrow slit is when you attempt to throw a rock out. There might be vision penalties, attack roll penalties or even penalties for how far the rock can even travel.
I've tried looking this up but there's no specific situation that covers what's happening here so I'm going to the forums to get some insight.
And the build he is doing, by the way, is this:
http://paizo.com/threads/rzs2qkpe?I-Throw-a-Rock-at-it