You create a 20-foot radius sphere of billowing, black muck and gas centered on a point within range. The cloud spreads around corners, and its area is heavily obscured. The cloud lingers in the area for the duration. The cloud's area is difficult terrain.
Each creature that enters the cloud for the first time on a turn or starts its turn there must make a Constitution saving throw. On a failed saving throw, the creature takes 5d8 poison damage, and must spend their action retching and reeling. On a success, the creature takes half damage, and may take actions normally. Creatures are affected even if they hold their breath or don't need to breathe, though creatures immune to poison are not affected.
The cloud is unaffected by a moderate or weaker wind. A strong wind (20 miles per hour or more) disperses the cloud after four rounds.
* - (a bit of dark sludge)
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