From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Breathtaking Vapor

ITEM 17

UNCOMMON ALCHEMICAL CONSUMABLE INHALED POISON

Price 3000 gp

Usage held in 1 hand

Bulk L

Category poison

Activate (manipulate)

This colorless mist has a mild, waxy scent that precedes acute shortness of breath. Creatures that don't need to breathe can still take the poison's damage but are immune to its other effects.

Saving Throw DC 38 Fortitude

Onset 1 round

Maximum Duration 6 rounds

Stage 1 6d6 poison damage, Drained 1, and can't breathe

Stage 2 8d6 poison damage, Drained 2, and reduce remaining air by 1 additional round

Stage 3 10d6 poison damage, Drained 3, and reduce remaining air by 2 additional rounds

Pathfinder Treasure Vault (Remastered)ORC