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2d 20A dital PDF of Fallout: The Roleplaying Game - 2d20 Rules Booklet, a book which helps Overseers use the 2d20 ruleset from ModiphiusD20s are used for resolving skill tests, and for rolling on certain large tables. Often, two or more d20s will be required. This is noted as Xd20, where X is the number of dice to be rolled.