Originally Posted by
Lauront
On that point, was it confirmed that it is made of his own aether, or is this an inference from it being a familiar (unless that in turn confirms it)?
It's also worth recalling that whilst fragmented, some souls on the First do still possess the Echo, which could be the case with him. That, plus an unfamiliar fighting style, may have proved enough to temporarily allow him to hold off the WoL... until it wasn't enough.
He is an interesting character and I am glad they avoided going down the "part Sin Eater" route for him, because I feel it'd cheapen it somewhat as a plot angle, given that it had already been used for Vauthry.