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Kulle's Journal is a four-part tome found in Act II of Diablo III. Its pieces are found during the "Blood and Sand" and "The Black Soulstone" quests.

The parts read as follows:

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! (Found in the Vault of the Assassin)

Part 2[]

I believe with this soulstone I will finally be able to unlock the true power of man. In ancient times, our kind possessed power unmatched in this dreary age. With the soulstone, I will be able to elevate myself to the strength of my ancestors. (Found in level 1 of Cave of the Betrayer)

Part 3[]

The Black Soulstone will be my greatest work, my legacy, and my gift to humanity. There will be wars to come between man and the creatures of Heaven and Hell. The power housed within my stone is the very thing needed to set mankind free from demons and angels forever. (Found in Cave of the Betrayer, level 2)

Part 4[]

The wards have been triggered. It seems my brothers have finally come looking for me. Damn them! I am not ready. Too much of my power is invested in the stone's creation. I must finish it. The future of mankind depends on it... (Found in the Soulstone Chamber)