fiction for millions of Blizzard fans, Diablo III: Book of Cain is the source book for Blizzard Entertainment's Diablo franchise and forthcoming Diablo III game. Book of Cain is the must-have illustrated history of the Diablo universe as told by the games' core narrator Deckard Cain. In Blizzard Entertainment’s Diablo® and Diablo II, the "Book of Cain" may refer to: Book of Cain, the commercially released sourcebook Book of Cain (Diablo III), an object used to identify items Book of Cain (Pet), a pet in Diablo III diablo-iii-book-of-cain and a great selection of related books, art and collectibles available now at AbeBooks.com. With the new book "Diablo: Book of Lorath" being announced, we can safely assume that Lorath Nahr will play a significant role in Diablo IV's story.Similar to "Diablo: Book of Cain", which released before the launch of Diablo III, and "Diablo: Book of Tyrael" released ahead of Diablo III: Reaper of Souls. gBX0ksY.