Upgraded Lightning Bolt

A stroke of lightning forming a line 113 feet long and 3 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Constitution saving throw. A creature takes 8d8 lightning damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d10 for each slot level above 4th.