the only purpose for this mirror is to duplicate the key found at as many times as possible at 7
here is that correct?
is there an experience award if you get all 4 doors open?
is it possible for the mirror to never break, so that you can copy the key a 4th time, thus keeping the original and still opening all 4 doors (by dropping the original, and opening a door with the duplicate, then picking up the original to duplicate again)?
you must drop the original to duplicate it more than once because the copies don't work with the mirror, and if you open a door with the original in your inventory, the original is used before the copy(ies) is (are).