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Synonyms: Matt Mercer Effect, Matthew Mercer Effect Matthew Mercer is the Dungeon Master of the popular Dungeons & Dragons show "Critical Role". The "mercer-effect" is what people call it when fans of the show get into D&D carrying the expectation that their sessions should be at least as good or similar to what they've seen in the show, not keeping in mind that the players seen on Critical Role have years of experience in both D&D and acting.
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