One of my favorite things about the release of the original Diablo was the lore book that came with the game. The many pages of this tome held the backstory and the mystery/power of what lay beneath Tristram. But now Blizzard is planning on releasing a lore book on the Complete series of Diablo.
The Diablo compendium is being positioned as the journal of Deckard Cain, the wizened advisor to characters in the game. The book includes an extensive rundown of lore and history for the Diablo franchise, ranging from class descriptions to notable people.