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KingOfStickers
Since: Jul, 2014
A work (video game, movie, tv series, etc.) has a book come out that provides additional, pseudo-canonical info to supplement the work. It's not a part of the work or necessary to understand it, but is sold to hardcore fans. A prime source of Word of God or Word of Saint Paul
This may include explanation of the work's plot threads, character backstories, worldbuilding, maps, etc. along with character designs, storyboards, and the like.