Air Spores

These spores are creations of Waervaerendor, a secret stolen from a green hag who attempted to turn the brothers against each other (which she paid for, dearly). Waervaerendor uses the spores to keep prisoners he has captured in his portable hole alive as he takes them back to his lair. 

Each phial of spores has enough for one use. When you use an action to throw the spores into the air, you and each creature within 10 feet of you can breathe normally in any environment and have advantage on saving throws made against harmful gases and vapors (such as cloudkill and stinking cloud effects, inhaled poisons, and the breath weapons of some dragons). The effects last for 2d4 days.The duration is the same for all subjects, and the spores are consumed when their magic takes effect.

Notes: Advantage: Saving Throws, Buff, Warding, Consumable