Ability Scores

Six abilities provide a quick description of every creature’s physical and mental characteristics:

• Strength, measuring physical power
• Dexterity, measuring agility
• Constitution, measuring endurance
• Intelligence, measuring reasoning and memory
• Wisdom, measuring perception and insight
• Charisma, measuring force of personality

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 attack roll-rely on the six ability scores. The book’s introduction describes the basic rule behind these rolls: roll a d20, add an ability modifier derived from one of the six ability 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 of that ability. An ability score is not just a measure of innate capabilities, but also encompasses 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 are a cut above average in most abilities. A score of 18 is the highest that a person usually reaches. Adventurers can have scores as high as 20, and monsters and divine beings can have scores as high as 30.

Each ability also has a modifier, derived from the score and ranging from -5 (for an ability score of 1) to +10 (for a score of 30). The Ability Scores and Modifiers table notes the ability modifiers for the range of possible ability scores, from 1 to 30.

Ability Scores and Modifiers

To determine an ability modifier without consulting the table, subtract 10 from the ability score and then divide the total by 2 (round down).

Because ability modifiers affect almost every attack roll, ability check, and saving throw, ability modifiers come up in play more often than their associated scores.