The Single Most powerful *thing* in FFXIV?

[Vyrerus]

I thought Alpha's robot buddy was a fake.



Is it implied (or otherwise explicitly stated) that this is somehow the actual Omega? Or were you referring to something else?
That final cutscene still tugs at my heartstrings, though.

As for most powerful thing, I wanted to point toward Ultima, but neither spell nor high seraph proved to be anything but disappointing.
Midgardsormr is probably up there, and he's definitely not "spent." He's just napping. Source: https://na.finalfantasyxiv.com/lodes.../#sidestory_08 Fun fact: This story also mentions the replica Omega.
However, I would still say the greatest threat we're aware of would probably whatever star was at war with the Dragonstar, if they're still around (I don't recall). Omega is scary, but it's just a weapon.

Look at the short story in that same line, "A World Forsaken." It is told from the perspective of the "fake" buddy. Omega is very much still functional. Also for the Alphascape Savage, he actually planned ahead and left the WoL simulations of him with even more power or whatever, so there's that.

Also if both of you look at the benchmark, Fandaniel is going to making use of a model Omega, likely a replicated version that's not truly Omega, in Endwalkers.