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You unsheathe your Axe and strike the boulder a mighty blow that shatters the rock and frees your trapped foot. You fall to the base of the ravine, but your natural agility enables you to twist in mid-air and land safely on your feet without further injury.
Quickly you ascend the steep gully wall and retrieve the steel tube. You tuck it into your belt and then climb back to the top of the ravine before you stop to examine what the tube contains.