Make a Dexterity Check at difficulty 16 (unless you are a Thief (code A2), in which case your expertise reduces the difficulty to 12). Increase the difficulty by 2 if you have code J7, as the dragon’s head is then in your path.
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On a failure, go to the number you Recall. A partial success leads to the Memorized number. A full success lets you cross safely to 532.