Q: Are the Warcraft and World of Warcraft RPG books considered canon?
A: No. The RPG books were created to provide an engaging table-top role-playing experience, which sometimes required diverging from the established video game canon. Blizzard helped generate a great deal of the content within the RPG books, so there will be times when ideas from the RPG will make their way into the game and official lore, but you are much better off considering the RPG books non-canonical unless otherwise stated.
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