Thunderbolt

You cast forth a bolt of lightning, which strikes a creature or object within range and releases a crack of thunder on impact. Make a ranged spell attack against the target. On a hit, the target takes 1d4 lightning damage and 1d4 thunder damage.

This spell's damage increases when you reach certain levels. Both damage rolls increase by 1d4 when you reach 5th level (2d4 and 2d4), 11th level (3d4 and 3d4), and 17th level (4d4 and 4d4).