Lucky is a passive feature in Baldur's Gate 3 that grants all halflings to reroll a die when it lands on a 1 for an Attack Roll, Ability Check, or Saving Throw.
Description
When you roll a 1 for an 
Attack roll, 
Ability check, or 
Saving throw, you can reroll the die and must use the new roll.
How to learn
Races:
- Character level 1: Halfling
(Character level is the sum of all class levels for a multi-classed character.)