As a Bonus Action, you can gain a bonus to your Strength and Dexterity scores for 1 minute. This bonus is +4 if the ability score is 14 or lower, or +2 otherwise, up to a maximum of 22.
Once you use this feature, you can't use it again until you finish a Short or Long Rest. You can also restore your use of it by taking 5 Radiant damage. This damage ignores Resistance and Immunity, and bypasses Temporary Hit Points.