I was trying to build a tower shield fighter and was a little confused about how to calculate the armor class bonus for the tower shield. It says that it is 4^3? This seems like it would be a little too good...and in pathfinder that usually means it isn't correct. But if it is only +4 I don't really see the benefit of taking the -10 penalty if a heavy steel shield is +2 with only a -2 ACP. Does anyone know how to correctly calculate this?
