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Is a character muscle-bound and insightful? Brilliant and charming? Nimble and hardy?Ability scores define these qualities — a creature’s assets as well as weaknesses.
The three main rolls of the game — the ability check, the saving throw, and the attackroll — rely on the six ability scores. The book’s introduction describes the basic rulebehind these rolls: roll a d20, add an ability modifier derived from one of the sixability scores, and compare the total to a target number.
==Ability Scores and Modifiers==
Each of a creature’s abilities has a score, a number that defines the magnitude ofthat ability. An ability score is not just a measure of innate capabilities, but alsoencompasses a creature’s training and competence in activities related to that ability.
A score of 10 or 11 is the normal human average, but adventurers and many monsters area cut above average in most abilities. A score of 18 is the highest that a person usuallyreaches. Adventurers can have scores as high as 20, and monsters and divine beings can
have scores as high as 30.