Poison Cloud

Poison Cloud, also known as Venomist, Virite, Noxious Cloud, Mist, Gas, and Toxin, is a recurring enemy ability in the series. It generally inflict non-elemental or Poison-elemental damage as well as Poison to the party.

Final Fantasy II
Poison Cloud XVI is an enemy ability used by Green Dragon, Iron Giant, Phrekyos, and Tiamat. It inflicts major Poison-elemental damage to the party.

Final Fantasy VI
Venomist is an enemy ability used by Daedalus, Exoray, Hidon, Kaiser Dragon, and Weredragon. It inflicts Poison-elemental damage and Poison to the entire party with a spell power of 20 and hit rate of 80 at the cost of 20 MP. If used against Undead targets, it will heal them instead.

Final Fantasy Dimensions
Noxious Cloud is a level 4 Ninja ability, which inflicts Toxify on a single target at the cost of 12 MP.