The 148-page book is an "in-world" piece of literature, formatted as though it was written and illustrated by [[Deckard Cain]]. It recounts the events of Diablo II, includes additional stories of the [[Angels]] and [[Demons]] and their battles, and summarizes the history of events during the twenty years between the conclusion of events in ''Diablo II: Lord of Destruction'', and the start of Diablo III.