T13

[Exodus-E]

I assume the fight will be indirect.

This.

See that pic? You know, the area where you fight Twintania at the end of T5?
That's Bahamut's right hand.

So, unless we end up fighting an avatar of his (already kinda done) or summon a giant robot to fight him mano-a-mano, it's VERY unlikely we'll battle him in his complete state.