Quote Originally Posted by TheCurls View Post
My first impression was that the voice belongs to one of the Twelve. The only ones whose souls were taken were those archons who prayed to the Twelve during the Bahamut calamity. Note that Lyse’s soul was not taken and that she was never actually an archon. That was her sister, Yda. (I can’t for the life of me find the timeline that says whether the Yda we see in the ARR opening cinematic is actually Yda or if it’s Lyse. Not that it matters, I suppose).

I’m probably wrong, because I don’t know every bit of lore. Just thought I’d share just in case someone can shoot me down or run with the idea.
There could be some credence to that possibility, though I believe it's been roughly determined that the real Yda was killed sometime before the point when the Archons first fought Gaius, and that it was at that point we first see Lyse assuming Yda's identity. If that is the case, then Lyse would have been the one to pray to the Twelve during the Calamity. Even if that's the case, it wouldn't be unlikely that Lyse could be soul-napped later on either.