They’re talking the probability of failure, not the specific number on the die. If your skill bonus meets the DC, you have a 1/20 chance of failing, assuming a natural one equates to an auto-fail. If your bonus doesn’t meet the DC, you have a higher chance of failing.
They’re talking the probability of failure, not the specific number on the die. If your skill bonus meets the DC, you have a 1/20 chance of failing, assuming a natural one equates to an auto-fail. If your bonus doesn’t meet the DC, you have a higher chance of failing.