Holding out your hand you flick flames at foes.
At the start of each of your turns, and when you cast this spell, you may use your action to aim a spitting gout of fire. Each creature in a 20ft line out from you must succeed on a Dexterity saving throw or take 2d6 Fire damage. creatures take half damage on a successful save. The flames can also ignite flammable objects that arn't being worn or carried.

When you cast this spell using a spell slot of 2nd level or higher, increase the length of the line by 10ft, the damage by 1d6, or the duration of the spell by up to 2 rounds, for each level beyond the first.