Stinking Cloud

When a stinking cloud is cast, the wizard creates a billowing mass of nauseous vapors up to 30 yards away from his position. Any creature caught within the cloud must roll a successful saving throw vs. poison or be reeling and unable to attack because of nausea for 1d4+1 rounds after leaving the cloud. Those who make successful saving throws can leave the cloud without suffering any ill effects, although those remaining in the cloud must continue to save each round. These poisonous effects can be slowed or neutralized by appropriate magic. The cloud duration is halved in a moderate breeze (8–18 m.p.h.) and is dispersed in one round by a stronger breeze.

The material component of the spell is a rotten egg or several skunk cabbage leaves.

High-Level Campaigns Book note

Stinking Cloud: A permanent stinking cloud remains where it is created and generally is not disturbed by minor effects. If dispersed by a strong breeze or a gust of wind spell, the vapors return one round after the breeze or wind ceases. Even hurricane force winds cannot destroy the cloud, though the vapors are dispersed and ineffective while the winds last.

Sage Advice (Dragon magazine #238)

: Q. How do you handle the effects of a stinking cloud spell? How can any creature move out of the cloud if it is rendered helpless? : A. A successful save versus poison indicates that the creature moves out of the cloud immediately and is helpless for a full round afterward. A failed save indicates that the creature is helpless for 2-5 rounds before leaving the cloud, remaining helpless for one round after it emerges.