Arc of Lightning

You create a web-like arc of crackling lightning that leaps between your enemies. Choose a point you can see within range. From that point, lightning lashes out in 10-foot lines to up to three creatures of your choice within 30 feet of the point. Each creature must make a Dexterity saving throw. On a failed save, a creature takes 5d6 lightning damage, or half as much on a successful one.

For the duration, at the start of each of your turns, you can use your action to direct the web to leap to a new point within range. Any creatures within 30 feet of the new point that you choose must make a Dexterity saving throw, taking 5d6 lightning damage on a failed save or half as much on a success.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the lightning damage increases by 1d6 for each slot level above 3rd.