Aqua Breath

Aqua Rake, often translated as Aqua Breath or Aqualung, is a recurring Blue Magic spell from the series. It will usually deal water-elemental damage to all opponents.

Final Fantasy IV
Although there is no Blue Magic in this game, Edge's Flood spell is similar in effect.

Final Fantasy V
Aqua Rake is a Blue Magic spell that deals water damage to all enemies. It also deals 8x damage to Desert creatures, making it an extremely lethal weapon against such enemies. It's so powerful that it can kill Sandworm in one single hit, and Land Crawlers in three. A Blue Mage may learn Aqua Breath from the Dhorme Chimera, Manticore, Leviathan, Bahamut, Azulmagia, Water Crystal, Enuo, Gogo, and Aquagel enemies.

Final Fantasy VI
Strago has Aqua Rake as one of his initial Lores. In this game, it also deals wind-elemental damage. A separate Lore called Cleansweep, learned from enemies such as the Enuo, deals pure water-elemental damage.

Final Fantasy VII
Aqualung is an Enemy Skill learned from the boss Jenova LIFE, and the enemies Harpy and Serpent. It deals massive water elemental damage to all opponents. The MP cost is 34. If the entire party is in the Reflect status and Aqualung is used against them, the spell will hit back three times. This, along with the fact that few enemies have water resistance, makes this Enemy Skill very effective against bosses and strong enemies.

Final Fantasy VIII
Quistis can learn Aqua Breath by using Water Crystal item. To get Water Crystal, you can mug Water Crystal from Fastitiocalon. You also can refine Water Crystal from Triple Triad cards by refining 1 Fastitocalon card into 1 Water Crystal, or refine 5 Fastitocalon F card into 1 Water Crystal by using Quezacotl's Card Mod ability.

Final Fantasy IX
Quina can learn Aqua Breath from enemies such as the Sahagin, Gigantoad and such.

Final Fantasy X
Kimahri can learn Aqua Breath from the Chimera enemies.