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That would be the Dungeon Master's Screen. Sometimes referred to as a DM Shield, or Game Master's Screen (especially in non-D&D games), they are designed to give the Dungeon Master quick access to frequently referenced rules, and to obscure dice rolls the DM doesn't want to players to see. They are usually filled cheat sheets to status conditions, more ...
I have a list of links to random generators that haven't been mentioned yet: Age of fable Gozzys.com Wizardawn
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