Asphyxiate

Choose a point within 60 ft of you. In a radius of 10 ft, the oxygen is rapidly replaced by carbon dioxide and other toxic substances. All fires are extinguished. Creatures that need oxygen must make a DC CON Save or take 5d8 necrotic damage. Creatures must make another DC CON Save or be blinded or poisoned for the duration of the spell or two rounds after they leave the area. When cast with a higher spell slot starting at 6th, the damage increases by 1d8. Additionally, the radius and range increase by 10 ft every spell slot level.