Blessing from Above

3rd-level abjuration

Casting Time: 1 reaction, which you take when you see a creature fail a saving throw

Range: 30 feet

Components: V, S, M (a metallic dragon’s scale worth)

Duration: instantaneous

Classes: cleric, paladin

You make a plea to the god of justice, asking him to aid one of you allies. Using your reaction, you allow a creature that you can see within range that failed a saving throw to reroll the saving throw with advantage.

The creature must keep the second result.