Summary: offensive spells that are not yet in the game (and which job could get them)

[ReiMakoto]

Technically, Ultima is actually used by an enemy in the game. As I recall, God Kefka uses the full Ultima spell in O8S.
I'd still like to see RDM get Ardor at some point as a shoutout to it being used on the job in FFXII's Zodiac system. Not sure if there's too many others that haven't shown up in one form or another.

O8s doesn't actually happen though lore wise, its a what if scenario brought about by the wandering minstrel embellishing things, thats why these fights can be so catastrophically powerful.