A beam lightning forming a line 20 feet long and 5 feet wide erupts from your hand in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 14d6 lightning damage and is paralyzed for 3 rounds on a failed save, or half as much damage and is stunned until your next turn on a successful one.
A creature with the Dragon type is especially vulnerable to this spell and has disadvantage on it's saving throw. Dragons are not immune to the paralyzed condition imposed by this spell.
The lightning ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 2d6 for each slot level above 6th.