*Spoilers* The Past and After the Endwalker MSQ End

[Cilia]

Dynamis was such an esoteric field of study Emet-Selch didn't know about it, Venat didn't know about it, his fellow researchers on Elpis knew little to nothing about it, and Hermes was the only person known to have intentionally created an entelechy - and a self-willed one, at that. Even if others knew about dynamis, with the information at our disposal he was unquestionably the expert on the subject. I seriously doubt any other researcher would be able to work just as well.

Ultimately Elpis exists as part of a time loop; everything that takes place there already happened, therefore we have no way to actually change the events that take place there without creating a paradox. You can go backwards in time without creating a paradox, but if you "change" the future and / or are not in a time loop you won't be able to return to the present from which you sallied forth unto the past. We don't know if G'raha could do it because he never tried, and the PC's interest was in saving the world of today, not yesterday.

Besides which as per multiverse theory there are infinite other realities where Amaurot never fell. So, go nuts in fanfics.

[Veloran]

Dynamis was such an esoteric field of study Emet-Selch didn't know about it, Venat didn't know about it, his fellow researchers on Elpis knew little to nothing about it, and Hermes was the only person known to have intentionally created an entelechy - and a self-willed one, at that. Even if others knew about dynamis, with the information at our disposal he was unquestionably the expert on the subject. I seriously doubt any other researcher would be able to work just as well.

Nothing we're told about Hermes' contribution to the Zodiark project has anything to do with Dynamis. Rather it's recognizing the connection between areas afflicted with the Final Days and the stagnicity of the aether currents in those locations that he's credited with. Something Venat was already aware of.

You can go backwards in time without creating a paradox, but if you "change" the future and / or are not in a time loop you won't be able to return to the present from which you sallied forth unto the past.

Venat suggests that WoL may actually be returning to an altered future if she is successful in safeguarding her present.