Agnar makes a valid point jack your shrine can stop magic, sure that's fine. But it can't just stop anything from reaching valorim. If Rhena did teleport a non magic item, animal, or person outside that barrier and it moves closer then your shrine can't stop it-as its meant to stop magic, nothing else. For example, if she teleports a group of men on a ship outside the barrier and has them move in to destroy the shrine, then it can't stop them because none of them are magic or use magic and they were brought just outside the radius of the barrier.
Brian and Carl nod as they board their ship and begin sailing to Valorim, to do a quick check on the port before heading on to Thorokas.