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Caves (south hallway, cave-in)
Bannock, with some exertion, you are able to move a rather large stone out of the way, by dragging it back and out of the way. You can see, now that Arnir has brought the light, that the cave-in, while not an insurmountable task, would take the party many, many hours of intense physical labour to clear enough space.
Arnir, you know that it is fairly common for ancient tombs, dungeons and other structures to succumb to cave-ins, sink holes and other structural calamities. In order to pass through, the party would need to clear about 750 cubic feet of stone and it is unknown how much more stone still rests above the cave-in.