Feolthanos

Feolthanos is the main antagonist of Final Fantasy XII: Revenant Wings. An Aegyl, he has been alive for a long time, thanks to the Auracite. With the Occuria barrier around Lemurés gone, he has started a plot to get revenge on the world.

Story
Long ago, Feolthanos was the leader of the Aegyl. During his rule, he took a Viera wife and had children. These children would become the Feol Viera, named after him. However, during his rule, he revolted against the Occuria, and took his people to Lemurés. Before he did, he left behind treasures for his Viera children, in the form of some Auracite and the giant airship, the Beirouge. He hoped that they would be able to reach him some day in Lemurés.

Angered by Feolthanos' revolt, the Occuria locked Lemurés away in Mist, and Feolthanos with it. The Aegyl eventually became reclusive, and forgot the outside world.

Feolthanos went mad though. He used the Auracite and Cloudstones to build a palace high in the sky, even above the Purvama. Here, he absorbed the Auracite's power and became a god himself. However, he could do nothing due to the Occuria's barrier.

Centuries later, thanks to all the mist released by Vayne, the barrier around Lemurés failed, and Feolthanos could begin his revenge on everyone. Possesing the young Feol Viera Mydia, Feolthanos turned her into the Judge of Wings, an embodiment of his anger and hatred. It was because of the recent lose of her love Velis and the fact she was a Feol Viera that made her the best choice to be possesed.

Using Mydia, Feolthanos gathered Auracite from all the main islands located in Lemurés. he would use their power to become even stronger. However, the young sky pirate Vaan, and his friends, started to interfere.

Eventually, they reached Feolthanos' palace high in the sky, and found out that he was merely an Aegyl trapped in Auracite. However, this Auracite gave him incredible summoning powers, and so the ensuing fight was tough. They eventually beat all the summons, but Feolthanos has absorbed enough power by then. The room they're in collapses, and the party must run away.

A portal to another would has now opened up, and the party venture in. Here, they travel deeper into the other world, where they eventually find Feolthanos Exalt, a giant god. However, the party manage to defeat him in battle, and his powers fade away.

Back in Feolthanos' throne room, Vaan finds himself alone, and Feolthanos appears in his throne. Even though he has lost all the power, he is still incredibly stong, and nearly kills Vaan. However, Vaan's friends show up, and together, they finally defeat the misguided Aegyl. Realising what he's done, Feolthanos finally lets himself fade away. However, with him now gone, Lemurés starts to crumble away, never to be seen by the people of Ivalice again.