Arc Lightning

Choose two creatures you can see in range that are within 30 feet of each other. A bolt of lightning leaps between the two targets. Both the targets and all creatures in a line between them must make a Dexterity saving throw, taking 2d8 Lightning damage on a failure, or half as much on a success.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, increase the Lightning damage by 1d8 per spell level.