Kulle's Journal
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From Diablo Wiki
Part 1
Finally, I have unlocked the secret of the soulstones once given to the Horadrim by Tyrael. An impressive creation, to be sure, but one that I am certain can be duplicated. No, not just duplicated - improved upon. My soulstone will be made to contain the souls of many demons, or even angels! -- Zoltun Kulle