As for the BF dungeons, they are radomly generated, so it is difficult to say what to do. Is there no way to get to the entrance from another side?
The cheating archer: you have two options:
1) speack to the cheating archer he will be identified as Champion archer IIRC
or
2) speak to one of the soldiers (can't remember what he is called), he should be near the arhery.
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