About the Blessing of Light and the Echo

[Absimiliard]

Is there an example of someone with the Echo being tempered?

The only thing I can recall is Emet-Selch saying that Zodiark tempered the Convocation, which I'm hesitant to embrace as objective lore because he is at times an unreliable source.

One of the moon rabbits touches on it while explaining the difference between proper creation magics and the flawed summoning magic shared by the Ascians. As you're likely aware, the former does not include the flaws of aether consumption and tempering. There is, however, one exception noted during the explanation: beings on the scale of Zodiark. As it's explained, Zodiark tempered them through its sheer, overwhelming power alone. This was described by the rabbit in question as feeling a "slight tug," which in context would be the seemingly lesser form of tempering we see afflicting the unsundered. Well, Emet-Selch, at least. Elidibus was little more than a primal driven by singular purpose for most of the time we knew him, and Lahabrea was so far gone to madness that his duty was all he saw. With them, it's difficult to tell how much was tempering and how much was just their unfortunate circumstances. Emet-Selch is really the closest thing we have to a proper gauge. At any rate, we're given no reason to believe he's an exception to the rule.

So, put simply, the Echo can be overwhelmed by a sufficiently powerful force. Big Z tempered a bunch of unsundered ancients just by existing, but it wasn't severe enough for them to lose themselves.

There's also the matter of memories. It is suggested during the Eden storyline that a sundered Ascian taking on their ancient memories will become subject to Zodiark's tempering again, just as their past selves had been. Notably, all of the sundered Ascians we encounter (with the exception of Fandaniel) seem to be far more strongly affected by it than their unsundered counterparts.