I believe I have Wall of Stone prepped, I have to double check. EDIT: Yep I do. I can do 50ft of stone that is 2 1/2 inches thick. I can make it thicker by using less space. Since its a 5th Lvl Spell, I don't think I can use Widen Spell or any of the metamagic feats to strengthen it. Only way I can strengthen it is spend an AP to reprep it and put up another layer. I can plug the breach and buy us a round or two more time but that's it. I can also shape it to give us port holes (whatever they are called) for archers, but that would weaken it a bit.