After you retreive the book of Divine Intervention go to Harmondale and sell it. Then go to the arbiter and click on "I lost it" he will give you another one. Go outside and drop it, then go back inside. Repeat this process of getting the book and dropping it outside then getting another one. After awhile pick up all the books and sell all except 1 so you can complete the quest (works best with grandmaster merchant)

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