Is it really the end? *Spoilers*

[AnimaAnimus]

Yes, but again, we would not need as many crystals as dead ancients. They created him, not just summon him, so the aetherial requirement should be greatly reduced. And scholars for millennia have been studying the art of summoning, so the knowledge likely won't go anywhere.

But for the last point, even though we can undo tempering, if someone does summon a primal the likes of Zodi and knows how to bypass the amulets, tempering en masse may prove to be effective, even with a cure. If you have the ability to temper and the mind of a tactician, mass tempering may prove too powerful to simply just cure everyone. And if anyone comes after you, you can just temper them as well and be done since the blessing of light no longer exists after all those who now have it are gone. I never understood why the primals themselves didn't employ more mass tempering methods in the first place. The only thing I could think of would be, it would just make the story end lol.

[Iscah]

Yes, but again, we would not need as many crystals as dead ancients. They created him, not just summon him, so the aetherial requirement should be greatly reduced.

That isn't how summoning works, at least by our current understanding. Each time a primal is summoned, it is created anew by the summoners based on their concept of the entity they are summoning.

[Baxcel]

That isn't how summoning works, at least by our current understanding. Each time a primal is summoned, it is created anew by the summoners based on their concept of the entity they are summoning.

To add to this, summoning is creation magic but a flawed form of it that was altered by the Ascians to include the tempering..

When the Ancients summoned Zodiark they did use summoning magic just like the beast tribe did, but due to being unsunderned(sp?) They held a vastly larger supply of Aether in their bodies and could do such summonings without crystals which are just aether in a storage unit.

Now take the fact that to summoning Zodiark they sacrificed HALF of their population with the extra Aether they held and then after summoning him sacrificed another half of that half to him for halt the end of days at which point Vant an her followers summoned Crystal Mom(not spelling that name from memory lol) and sundered the entire world including the vastly more powerful Zodiark.

[kaynide]

That isn't how summoning works, at least by our current understanding. Each time a primal is summoned, it is created anew by the summoners based on their concept of the entity they are summoning.

+1 this; I believe we see this in Titan's summoning when Ga bu's rage at the loss of his parents influences the version of Titan we fight in his storyline (Titan has spoken lines that are what Ga Bu would be screaming).

This is not to say there isn't some residual memory between summons though (we don't know about this). The only thing I can point to a short couple of lines between Garuda and Susanoo that suggests Garuda is doing what is asked of her begrudgingly. There is nothing to explain why she might feel this way.