The Monster Manual is a book that just informs you on the different monsters in the world of D&D. This manual is useful for dungeon masters.

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The Player's Handbook is a necessity in the world of D&D whether you are a Dungeon Master or just a player. The handbook is the basic rule-book and character creator that everybody needs in order to play.

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The Dungeon Master's Guide is the book that every dungeon master has read. This guide is the thing that gives the dungeon master an idea of let the players partially tell the story.

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