I love how the music in O12 is a mix of Maker's Ruin and Torn From the Heavens, I'm always a sucker for that trope of incorporating the main theme(s) into the final boss music, although it does make me think that it's a bit unsuited for Omega...
It's perfectly suited. It's basically remixed Praetorium music, it's where you fought the Ultima Weapon, and this thing is Ultima's beefier cousin.

It's really the one part of the fight that actually made perfect sense to me.