Scales of War
These strange brown mushrooms normally grow only in the Underdark. As soon as a creature disturbs a colony of cloudspores, the mushrooms release a thick cloud of spores. The spores provide concealment until the spores settle 5 minutes later. Once a mushroom has discharged a cloud, it cannot do so again for 24 hours.
With the correct equipment and training, cloudspores can be distilled into effective potions of concealment.