Destabilize

Choose a point within range. You excite the weave, causing all magic within a 20 foot radius to become unstable. Whenever any creature casts a spell, uses a magic item, or attacks with a magic weapon while within the affected area, they must make either a constitution or wisdom saving throw. On a failed save, they take 2d4 fire, lightning, thunder, acid, poison, cold, necrotic, radiant, or force damage chosen at random.

At Higher Levels:  when cast with a spell slot of 3rd level or higher, the area of affect increases by 5 feet per spell level and the damage increases by 1d4 per spell level