Diablo Wiki
For similarly named items, see Book of Cain (disambiguation).
"Take heed, and bear witness to the truths that lie within, for they are the last legacy of the Horadrim."

- Intro text(src)


The Book of Cain in Bastion's Keep

The Book of Cain is an object that is used to identify all unidentified items in a player's inventory with a single 5-second cast, at no cost. It can be found in every town of Diablo III, right next to the stash chest.


The Book was originally written by Deckard Cain. It incorporated texts from various sources, as well as original writings and research. These were focused on Sanctuary and its history/geography, Heaven and Hell and their respective denizens, and the Prophecy of the End of Days.[1]

After Cain's death, Leah took possession of the tome[2] and continued to work on it.[3] After her death, Tyrael retrieved her writings from Bastion's Keep and incorporated them into his own work.[4]


Book of Cain CU

Book of Cain model close-up

Before Deckard Cain is killed by Maghda, he can perform the same action as the book if spoken to. The Nephalem is also capable of identifying their own items without assistance, but the process takes the same amount of time for just a single item, and they cannot identify multiple items simultaneously. Therefore, the Book is best used when multiple Legendary or Set item items have been collected.

Before patch 2.0.1, the Book of Cain was useful for identifying multiple Rare Items at once. After rare items were changed to not require identification, it initially became less useful, since Legendary Items could be identified directly from the inventory. As higher difficulty modes and Greater Rift levels became available, Legendaries became more numerous, making the Book essential once again.