Reckless Instinct
You know how to seize an opportunity, even if it means putting yourself in harm's way.
While in combat, you can roll an additional d20 on a single attack roll, ability check, or saving throw. You can choose to use this ability after you roll the first die, but before the outcome is determined. You choose which of the d20s is used for the attack roll, ability check, or saving throw.
After using this ability, your next attack roll, ability check, or saving throw is made at disadvantage.