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PFS StandardStifling StillnessSpell 4

Air Concentrate Manipulate Poison 
Source Rage of Elements pg. 71
Traditions arcane, primal
Cast [two-actions]
Range 120 feet; Area 20-foot burst
Defense basic Fortitude; Duration 1 minute
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.