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.
A creature that enters the spell’s area for the first time on a turn or starts its turn there must make a Fortitude saving throw. If the creature doesn’t need to breathe or is immune to poison, the spell has no effect on it.
On a failure, it spends its actions that turn retching and reeling.
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.