Difficulty Class

The Difficulty Class (DC) is the numerical value that a roll needs to be equal to or greater to succeed.

For Ability Checks, the DC is defined manually by the game master.

Armor Class

For Attack Rolls, the DC is tied to the target's Armor Class.

Armor Class (AC) is a number unique to an entity, measuring how difficult it is to hit them.

To successfully hit them with full force, the result of an Attack Roll must be equal to or greater than the target's Armor Class. AC can be modified by many sources, like equipping shields, armor, using certain spells, or increasing finesse related Abilities.

The following formula determines AC when using an Idiom :

Armor Class = Armor + Signature Modifier + Shield Bonus + other bonuses and penalties

When wearing no armor, the armor value becomes 10.

The Signature Modifier is the Modifier of the Ability called Signature, a global indicator of an entity's finesse and fortune.

Save Difficulty Class

The Difficulty Class of a Saving Throw is called the save DC. The save DC for idioms is defined by multiple parameters.

Idiom Save Difficulty Class = 10 + Idiom's Flux Cost + Potential Modifier

The Potential Modifier is the Modifier of the Ability called Potential, a global indicator of an entity's Power and impact.