As two actions, you create a sphere of yellow, nauseating gas twice as big as normal centered on a point within 20 meters. The cloud spreads around corners, and its area is heavily obscured. The cloud lingers in the air for the duration.
Each creature that is completely within the cloud at the start of its turn must make a Fortitude saving throw against poison.
On a failed save, the creature spends its actions that turn retching and reeling. Creatures that don’t need to breathe or are immune to poison automatically succeed on this saving throw.
A moderate wind (at least 15 kilometers per hour) disperses the cloud after 4 rounds. A strong wind (at least 30 kilometers per hour) disperses it after 1 round.