This basically gets you an unlimited supply of the books "Doors of Oblivion" from a skeleton around Winterhold. The books are worth 50 gold and you can come back and get more from the skeleton as much as you like.
See the very helpful YouTube of how to do it here - http://www.youtube.com/watch?v=VANZutZaBYY. The basic steps are as follows:
1. Fast Travel to Winterhold.
2. Go South to Southeast along the path and the path branches up the mountain towards the "Sightless Pit".
3. Go up and around the "Sightless Pit" towards stone pillar.
4. You will see a skeleton laying on the altar.
5. Grab the boots and shield on the floor in front of the altar.
6. Destroy the skeletons.
7. Lot the skeleton in front of the altar for the "Doors of Oblivion".
8. Sell the books to any General Store and repeat!
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