Toxic Smog Cloud

You vent a 20-foot-radius sphere of glowing, radioactive fumes. Any creature that starts its turn in the smoke must make a Constitution saving throw or take 2d6 Poison damage plus 1d6 Fire damage and be Blinded until the start of its next turn. At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the poison damage increases by 1d6 for each slot level above 3rd.