Stifling StillnessSpell 4
Source Pathfinder Rage of Elements
Traditions Arcane, Primal
Cast

Area 20-foot burst
Range 120 feet
Duration 1 minute
Saving Throw basic Fortitude
You make all air in the target area unnaturally still and unyielding, creating a shimmering haze. The stagnant, heavy air becomes an area of difficult terrain. Creatures in the area that breathe air and aren't holding their breath must spend a single action on their turn straining to breathe the stagnant air; once they do, they still mostly breathe their own exhaled air, taking 3d6 poison damage (basic Fortitude save) and becoming Fatigued.
Heightened (+2) The damage increases by 3d6.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AirEffects with the air trait either manipulate or conjure air. Those that manipulate air have no effect in a vacuum or an area without air. Creatures with this trait consist primarily of air or have a connection to magical air.
ConcentrateAn action with this trait requires a degree of mental concentration and discipline.
ManipulateYou must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.
PoisonAn effect with this trait delivers a poison or deals poison damage. An item with this trait is poisonous and might cause an affliction.