Reactive Warping

When an area of effect spell is cast in an area you can see, you may use a reaction to sacrifice a spell slot to affect spaces within 30 feet of you that are also in the spell's area of effect. The number of spaces affected are equal to the level of the spell slot sacrificed. Creatures in the the spaces you affect automatically succeed in their saving throw and take no damage if they would normally take half damage from a successful saving throw.