Quote Originally Posted by ijuinkun View Post
It's the blue barrier within which casting is prohibited. In the space between the orange and blue barriers, anybody who was able to enter through the orange barrier can cast spells (which was the loophole that the Exarch pointed out as possibly being left in there so that the builders could influence things themselves). It is implied but not stated that standing in the intermediate zone and casting spells upon anything that is inside the blue zone is not permitted. It is DEFINITELY stated that spells can not be cast from within the blue zone.
I think that loophole was for simple reasons that he gave a sinister twist to - no magic means no healing and since elders are the most likely to suffer from illness they are the most likely to need healing spells