Quote Originally Posted by Lauront View Post
Only the Convocation was tempered, as a side-effect of the summoning due to the power that went into it, and even then, Emet-Selch could deviate from his original plan, where he deemed this to be appropriate. Elidibus was controlling the primal and emerged from him to mediate the dispute, so we can reasonably infer he knew what was happening with the souls inside of Zodiark, and may have even brought this into discussions between the ancients on that topic.
Where was it said that any Ascians were tempered? I remember that being a popular fan theory, but I don't recall any place in the game that says it.

Endwalker, in fact, outright contradicts it by saying that "tempering" was a side-effect diliberately invented by the Ascians when they taught summoners how to mimic creation magicks. That's why Livingway was able to fuel the Ragnarok with non-tempering summons, which she describes as summonings as they were originally used and intended.