In most games, isn't Ultima basically doing 9999 damage or bust and you only survive it because of a defensive limit break or you're "touched" by some higher power?

In 14, I really don't see it being a thing because for it to live up to its name would mean it would have to one shot just about the entire fight (or cleave health in a massive chunk), take 100% mana and then some, and probably inflict friendly fire at that, plus force a scenery change of utter destruction every time it was used, and then have a 20-30 minute cooldown between uses.