Swamp Breath

You inhale a large breath, then pull natural toxins into
your lungs, then exhale a purple poisonous cloud in a 15’ cone.
Creatures in this cone make a Constitution save or take 2d12
poison damage and become poisoned for the duration. A creature
starting its turn poisoned this way takes an additional 1d12
poison damage; it can then repeat the save at the end of its turn,
ending the effect on a success.
At Higher Levels. When you cast this spell using a spell slot
of 3rd level or higher, the damage dealt by the poisonous cloud
increases by 1d12 poison damage for each slot level above 2nd.