Strength measures bodily power, athletic training, and the extent to which you can exert raw physical force. Most physical attacks use Strength to determine damage.
Dexterity measures agility, reflexes, and balance. Ranged attacks and finesse weapons use Dexterity to determine damage. A high dexterity score also makes sneaking, disarming traps and unlocking things easier.
Constitution measures health, stamina, and vital force. Constitution directly affects your total hit points and also is used for many save checks that affect your physical well-being.
Intelligence measures mental acuity, accuracy of recall, and the ability to reason. Arcane spells use intelligence to determine damage as well as their difficulty checks.
Wisdom reflects how attuned you are to the world around you and represents perceptiveness and intuition. Divine and Nature spells use Wisdom to determine their potency, and Wisdom also helps in locating hidden objects.
Charisma measures your ability to interact effectively with others. It includes such factors as confidence and eloquence, and it can represent a charming or commanding personality. Charisma is used any time you must be persuasive, whether it be hostile or friendly. Paladins use Charisma to determine the potency of their spells.
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