Black Smog

You exhale a rolling cloud of corrosive black smog. The noxious smoke is expelled out in a 15 foot cone.

• Anyone caught in the black smog's path suffers 6d8 points of necrotic damage.
• A succesfull Constitution saving throw reduces this damage by half.
• Targets who fail their saving throw incur heavy lung damage and, unable to catch their breath, also suffer one point of exhaustion. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.