Bumbling Fool

You have a peculiar way of fumbling through life that somehow always works out in your favor, succeeding in situations through what others might view as accidental luck. When you fail an ability check and roll a number on the die equal to half your level (rounded up) or lower, you can choose to replace the die roll with a 15 instead. You can use this ability three times, and you regain all expended uses when you finish a long rest.