# Ability Score and Modifier *Source: Player's Handbook (2024) p. 360. Available in the Free Rules (2024)* A creature has six ability scores—Strength, Dexterity, Constitution, Intelligence, Wisdom, and Charisma—each of which has a corresponding modifier. Add the modifier when you make a [D20 Test](3-Mechanics/CLI/rules/variant-rules/d20-test-xphb.md) Test with the corresponding ability or when a rule asks you to do so.