Second Battle of the Iifa Tree

The Battle of the Iifa Tree occured shortly after the fall of Terra, when the Lindblum fleet and Alexandrian royal airship, the Red Rose, intercepted the numerous Silver Dragons swarming out of the strange orb of light above the Iifa Tree in order to clear a path for Zidane Tribal and the party as they intended to storm Memoria on board the Invincible.

Prelude
Shortly after Kuja used his newly acquired Trance powers, he learned from Garland's spirit that his power would never matter as he would die soon anyway; Zidane, the "Angel of Death" created after Kuja was meant to replace him. Upon learning that his amassed power would soon all go to waste, an enraged Trance Kuja destroyed Terra. Zidane and his party, who had chased Kuja to Terra, managed to gather all the Genomes in the Terran town of Bran Bal, commandeered Kuja's airship, the Invincible, and narrowly escaped back to Gaia.

Unfortunately, the Gaia that they returned to was not the same one as before Zidane and crew travelled to Terra. Kuja had reached Gaia before them and, using the Iifa Tree and his Trance powers, had forced roots of the infernal tree to burst out of the ground on all four continents of Gaia, casting a worldwide layer of Mist, previously isolated to the Mist Continent. Mist-created monsters invaded various points of the planet. More significantly, Kuja opened a portal above the tree where he intended to find the Crystal, the origin of all existence, and destroy it, annihilating everything. His reason was that if he could not remain immortal, no matter how much power he amassed, then neither could any other being.

Realizing this imminent threat, after leaving the Genomes in the care of the Black Mages in the Black Mage Village, Zidane and crew agreed to themselves, on Dagger's behest, not to inform anyone of this danger as well as their intention to invade Memoria to stop the nihilistic Genome.

Battlefield
The Battle, as the name states, occurs at the Iifa Tree. The difference with the Brahne's failed attempt of vanquishing Kuja, however, is that while the previous conflict was a ground/sea strike, this one was a sky battle, to be precise, above the newly-formed layer of Mist across Gaia.

Battle
In their attempt to defeat Kuja within Memoria, the Invincible was soon attacked by swarms of Silver Dragons sent by the Genome to prevent them from entering. One dragon was about to fire its breath at the Terran airship at point blank range when it was sudenly obliterated. Looking behind them, Zidane and Dagger saw the Lindblum fleet, under the command of Regent Cid IX appearing behind them and attacking the dragons. Onboard the flagship, the Hilda Garde III was the Tantalus Theatre Troupe, present to cheer for their former member Zidane.

The Invincible flew on while Cid's fleet kept the Silver Dragon occupied. However, one swarm was distracted by the ruse and followed the Invicible. The swarm would have attacked had not the Red Rose, under General Beatrix's command, suddenly burst from the Mist behind the Invincible, acting as a shield with Silver Dragons smashing onto it.

With all the dragons dealt with, the Invincible was able to breakthrough into Memoria. However, a Nova Dragon lay in waiting at the gates, and had to be felled by the party.

Aftermath
Once in Memoria, Zidane and company eventually traversed the dimension, fighting through the revived Shrine Guardians, now the Four Fiends and Deathguise, while both witnessing past memories (such as the destuction of Alexandria and Madain Sari) and seeing Gaia's past and origin. Eventually, they made into the Crystal World and engaged Kuja in one last battle.