Arc Bolt

You draw from the Elemental Power of Arc Light as you form a small mote of Lightning in the palm of your hand. You hurl the mote and a bright streak flashes from your hand to a point you choose within range and then blooms in a bright flash as Bolts of Lightning Arc out towards all hostile creatures in a 10-foot-radius Sphere centered on that point. Target creatures must make a CON Saving Throw. Targets take (2d8)+Spellcasting Modifier of Lightning damage on a Failed save and are Stunned for 1 Round (until the end of your next turn), or half as much damage on a successful Save and are not stunned. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by (1d6) for each slot level above 2nd level.