Arc Lightning

You concentrate on your hand making lighting spark all around it, thrusting downward the lighting archs from your fist to three different creatures within range. Each of those creatures make DEX saving throws taking 4d10 points of lighting damage on a failure 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 damage of the spell increases by 1d10 for each level above 3rd.