That was my hypothesis
oh so long ago. We're effectively living on a Primal, and Primals aren't inherently "bad", just all the ones we've faced (who've been summoned via Ascian teachings...) are actively leeching off Hydaelyn. Granted, perhaps Hydaelyn also guzzles aether like the rest of the Primals, given that's basically the lore behind Rejoinings at this point... Still... I'm hesitant to kill the very embodiment of the very land we walk on... Hydaelyn
seems self sufficient when you factor out Ascian meddling...
Also, because I completely missed it;
https://i.redd.it/ktkvi4o24n331.jpg
Oh... Oh no...
Based on the trailer though, it seems G'raha might be filling the role of useful idiot... I guess Minfilia as Agnes was far too obvious...