Level 3 Conjuration (Druid, Sorcerer, Warlock, Wizard)
Casting Time: Action
Range: 90 feet
Components: V, S, M (a curl of rind weeping black rot)
Duration: Concentration, up to 1 minute
A churning cloud of rot-spores blooms in a 20-foot-radius Sphere centered on a point you can see. The cloud spreads around corners, and its area is Heavily Obscured and Difficult Terrain. When a creature enters the cloud for the first time on a turn or starts its turn there, it makes a Constitution saving throw. On a failed save, the creature takes 3d6 Poison damage and has the Poisoned condition until the start of its next turn; on a successful save, it takes half as much damage and isn't Poisoned. A wind of at least 10 miles per hour disperses the cloud and ends the spell.
Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.