Voltaic Needle

You extend your hand, unleashing a piercing stream of lightning in the direction you choose. Each creature in a 15ft line extending out from you must succeed on a Dexterity saving throw or take 1d6 Lightning damage.

The spell’s damage and range increase by 1d6 and 5ft respectively when you reach 5th level (2d6, 20ft line), 11th level (3d6, 25ft line), and 17th level (4d6, 30ft line).