New speculation(im bored):
Omega calls us back to fight in the "Gammascape". We find *drumroll* Final Fantasy 4 tier!
First boss: Dark Elf - anyone wearing metal armor is paralyzed for the entire fight unless your party has a bard that is sufficiently spoony.
Second boss: The Four Fiends - start with one(lets say Rubicante so he can get his fair fight as you are starting out at full strength), and the next one swaps in as soon as you do enough damage to the one in front of you... or alternately, fight two at a time(probly fire + air, earth + water for the combos) or even fight all four at once for maximum chaos
Third boss: Giant of Babil - this would be more of a "mini-dungeon" raid as you would have to enter the giant and fight your way to the core and its defense system
Final boss: Zemus/Zeromus - same setup as exdeath/neo
I suppose you could sub in Golbez for the elf if the magnetic field/spoony bard requirement is too harsh(he could replace the giant also, but why would you want to do that?) and then just change the fight order
