The Difficulty (DC) represents how challenging the task is. The GM sets the Difficulty based on the circumstances.

Difficulty TierDCDescription
Trivial5Almost anyone can do this. Failure is rare.
Easy10A straightforward task. Most people succeed more often than they fail.
Normal15Requires some competence. An average person has roughly a 50/50 chance.
Hard20A significant challenge. Requires real skill or training to succeed reliably.
Impossible25Beyond the reach of most people. Only a highly trained specialist has a realistic chance.

There is no hard cap on Difficulty. The GM may set DCs above 25 for extraordinary circumstances. A DC 30 task would require a total bonus of +11 or more to have any chance of success.