Cobra's Breath

As you stretch your arms behind your back and arch your torso forward, you open your mouth and a venomous liquid sprays forth. Each creature in a 10-feet cone must make a Constitution saving throw. On a failed save a creature takes 6d6 poison damage and becomes poisoned until the end of its next turn. On a successful save it takes half as much damage and doesn’t become poisoned. At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each spell level above 3rd