Fortunate (5e Feat)
From D&D Wiki
You have some sort of luck that seems to protect you from the worst outcomes (only the worst, though).
When you roll a 1 on a d20 for an attack roll, ability check, or saving throw, you may reroll the die, and you must keep the new roll. You may only use this feature on an attack roll, ability check, or saving throw once even if you have advantage or disadvantage.