Astral Clock

Calling upon the intrinsic force of relative time between stars, you empower one willing creature within range with chronal magic. That creature, once, can choose to rewind time for itself; it can use a reaction to undo an action, movement, or bonus action it performs on its turn.

If doing so makes it so that, for example, they never suffered damage from an attack of opportunity, the creature that used its reaction to perform that attack regains said reaction as time is rewound. After this reaction is used, the spell ends.

At Higher Levels. When the spell is cast using a spell slot of 4th level or higher, the number of times time can be rewound increases for each slot level over 3rd.