Elemental Archfiends (Final Fantasy IV 2D)

The Elemental Archfiends are bosses in Final Fantasy IV fought in the Giant of Babil. Previous to the fight, the Archfiends were revived by Zemus so they could give one last group attack upon Cecil Harvey and his party.

The bosses are fought one after the other. In the SNES, PlayStation, and Game Boy Advance versions, the order of the fight is Scarmiglione, Rubicante, Cagnazzo, then Barbariccia. The Nintendo DS version rearranges the last three to put the fiends in the same order you fight the separate bosses, placing Cagnazzo before Barbariccia, and Rubicante after.

Strategy
The first stage of the fight is pretty easy, since all you have to do is Dualcast Curaja. But if you prefer to be fair, he pretty much uses the same strategy in the second battle. It is best to heal debuffs with Barbariccia comes since it is likely for him to recast any debuffs you restored. He is still weak to Fire, so use Ifrit or Firaga from Rydia and/or Firaga from FuSoYa. Fusoya can also heal along with Rosa. He also still has the Cursed Elegey, of course, as a counter.

When up against Rubicante, you can use the same strategies as in the first encounter, except know that this time Fusoya replaces Kain - he works well as a second Black Mage (casting Blizzara and Blizzaga, for example) or as an additional White Mage if needed. If you have completed the sidequest in the Feymarch and have access to Leviathan then you should use it here, as it is particularly devastating against Rubicante and can easily cause 9,999 HP of damage.

An alternate strategy is to cast Haste on Rydia, then use Shiva or Levithian when Rubicante opens his cloak, then use steal with Edge. After around four turns of this, Rubicante should fall. Since Rubicante should not be able to use Inferno when in his cloak, he will only be able to physically attack. Either use Rosa to revive characters killed with Rubicante's physical attack, or cast a Fire spell on Rubicante.

Against Cagnazzo, have Cecil attack, Edge use Blitz, Fusoya and Rydia use Thundaga and Thunder spells while Rosa uses Cure spells.

Barbariccia is immune to physical attacks, magical attacks are capable of harming her. Edge and Cecil have little to contribute offensively, so Rydia and Fusoya should focus on dealing out as much damage as they can while Cecil and Rosa focus on keeping everyone's health up. Barbariccia does not counter attacks as much, but she does attack more frequently than before. Though it is not mentioned in the bestiary, Holy magic is incredibly effective against her, so have Fusoya cast Holy or have Rydia summon Dragon. If Rosa Joanna Farrell is a high enough level, go ahead and Dualcast Holy.