Battle of the Giant of Babil

The Battle of the Giant of Babil was a form of diversion orchestrated by Cid Pollendina of Baron and the Dwarf King Giott of the Underworld to allow Cecil and the party to gain entrance to the Giant via the Lunar Whale and destroy it from within. The relief force of the Red Wings and the Dwarven Tanks came as a surprise to Cecil, who was not expecting any form of aid in his quest to destroy the mechanical monster. It marked as well the reappearance of Yang, who was thought to have been killed during the assault on the Tower of Babil, Edward, fully recovered from his injuries, Palom and Porom, who had petrified themselves to allow the party to escape from Baron Castle and of Cid himself, back from the Underworld.

The in-game events describe Cecil and the party making their way down from the Giant's head to its chest, where they fight the Four Archfiends consecutively and, afterwards, the Giant's CPU. Its destruction triggered the collapse of the Giant.

Aftermath
Just prior to the destruction of the Giant, Golbez appeared and was liberated from Zemus' influence by Fusoya. The two of them left to defeat Zemus by themselves while the party, joined by Kain, who had been freed from Zemus' influence as well, escape by boarding the Falcon and making their way out.