Bahamut sat on his throne, waiting for Zion to arrive. He knew that he would come eventually, no matter how long it took.
He didn't care to watch the middle world get decimated by the angels. He didn't care to look at the upper world and its messed up state. He didn't care to taunt the twin goddesses he captured to pass the time.
Why? Because he wanted Zion. He wanted to see the bastard's face as he crushed his skull. He wanted to brutally beat the boy until he begged for mercy. He wanted to show Luminera and Erebosa that their champion, the person they put all their faith in, failed.
Then, after he kills Zion, he would kill Luminera and Erebosa, claiming the world as his own.
Then, out of nowhere, an angel appeared in his throne room. Normally, they wouldn't be allowed in the heavenly realm, but Bahamut needed someone to keep him up to date with the things that were going around in the middle world, so he gave this one angel permission.
