Malodor
Malodor is a third level conjuration with a range of 90 feet, a duration of up to a minute, requires concentration to maintain, and has a material requirement of varying amounts of sulfur.
Malodor creates a 20-foot-radius sphere of noxious, foul-smelling gas. The more sulfur offered for the spell, the more powerful the stench. The legal limit for unregistered use is less than a gram, but just a pinch can make the spell thoroughly nauseating. Once the spell ends, the cloud dissipates, but the smell remains and can persist for days.
The United States Army classified the exact origin of the spell. But, it has been around since at least World War II. Law enforcement uses Malodor for riot control and as an area denial weapon. During the Christmas season, county administrators in the northeastern United States will sometimes use Malodor on public-property evergreens to discourage poachers. The most common use of the spell is to test the effectiveness of bathroom deodorizers.