I guess it depends on if you take Emet-Selch at his word when he told us that he and the other members of the Convocation were tempered and slaves to Zodiark's will. Personally, I kind of like to think that what he said was a lie to help him distance himself from his guilt over killing billions over and over again.
Of course, some people allude to Zenos's interpretation of the Echo/Resonance allowing you to contest the will of a Primal, and go as far to assert your control over it. Primals themselves are kind of like a perverse form of creation magic, and for the most part I assume they do not really possess souls, only physical aether and the will imparted on them by their summoners' beliefs. Though, Zodiark and Hydaelyn differ by having Ancients as their hearts/cores/base, so they did possess souls and rather strong full ones at that. With that being the case, it'd be easy to see that they have the stronger form and soul, with part of the primal's will being to subjugate other Ancients. So it makes sense that the Ascians could be tempered.
I think that tempering is basically the corruption of someone's soul, which is why remedying it is so difficult/impossible. Basically standard and even extreme versions of primals can't temper those with the Echo, because we have strong souls and the ability to use our soul and directly combat the wills of other.
I don't think Hydaelyn tempers people, because her entire point was to counteract the dictatorship of Zodiark. If anything, since her attacks were designed to split and enervate her opposition, then it stands to reason that she removed Zodiark's heart as well as his total control by also enervating his tempering effect.
Also in 2.0 our WoL picks up a Crystal of Light, hears Hydaelyn's voice, and is then shown the falling stars. She refers to us as crystal bearer, and tells us we must journey to find the other crystals. Once that concludes, the next we hear from her, is when she directly intervenes in the fight Ultima Weapon in Praetorium. She enervates it and removes its armor's integrity. Then she also allows us to combat Lahabrea without killing Thancred.
After that it's at 2.55 when she takes Minfilia, which we learn about in 3.x in the Antitower, where Hydaelyn has weakened considerably and had to take in Minfilia to save herself. As of now, that torch was passed to Ryne, with Minfilia's consciousness dying more or less, sorta similar to how Ardbert merges with us. Even they, Minfilia and Ryne, had/have wills that are completely their own. Though if I remember right, Hydaelyn was speaking through Minfilia the first time we talk to her after Antitower. It's fun to think about, but also mildly confusing.
		
		

			
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