Difficulty Class

For a comprehensive summary of the mechanics behind all rolls and modifiers, see Die Rolls.

Difficulty Class (or DC) is a number that must be matched or exceeded to achieve success when rolling for Ability Checks, Attack Rolls, or Saving Throws.

The Difficulty Class (DC) is determined by the source of danger. In scenarios such as traps, the game chooses an appropriate Difficulty Class, depending on how serious the danger is.

The Difficulty Class (or DC) for Saving Throws against Weapon Actions is calculated similarly to Spellcasting DC - except the Spellcasting Modifier is replaced with either Strength or Dexterity, whichever is higher. Additionally, base DC is 10. Each Weapon Action also grants its own inherent bonus DC that isn't listed anywhere, but most frequently it's +2. Certain Weapon Action also uses a Hybrid DC, which allows for a user's Spellcasting Modifier to be used instead.

Difficulty Class = 10 + Weapon Ability Modifier + Inherent Weapon Action Bonus DC

For the Difficulty Class of a Spell that imposes a Saving Throw, the DC is determined by the creature's Spellcasting Ability Modifier, using the following formula:

Difficulty Class = 8 + Proficiency Bonus + Spellcasting Ability Modifier

When attempting to beat a Difficulty Class, the die rolled is a  d20. The modifiers applied to this roll vary, depending on the circumstances and the type of check.

• Rolling a 1 on a d20 always fails.
• Rolling a 20 on a d20 always succeeds (except Ability Checks).