Barthandelus 2..... phhhhht!
The Vanille theme is available on the Extras menu option when you beat this obstacle.
Hmmm... Final Fantasy has one resonant theme throughout its many incarnations, 13 so far — short shrift for entities which set themselves up to be gods and demand worship from human scum. No matter how subtle, no matter how persuasive or awe-inspiring, whether Occuria or fal'Cie or whatever, the human scum invariably finds itself revolting ... and humiliating the high-maintenance pretenders to godhood.
In the end, playing these games through to conclusion leaves you with two huge impressions: a) there are deeper dungeons than these, and b) there are deeper, cooler heavens than those we've seen so far. As explorations of the human will to spiritual life, these games rank above the Pilgrim's Progress and maybe even reach as far as Tolstoy — Mikhail Bulgakov at least.