Yea, I'm pretty sure he's a (Poorly) disguised Elidibus. After all, he needs us to kill Bismark, Ravana, and probably at some point the warring triad (As apparently Primals and Eikons can even eat Ascian souls once their physical forms have been weakened) and it'd make since for him to be disguised since our Auracite trick combined with our blessing of light could end up killing him too. (Personally I still want to introduce this guy to the Sharp end of my Nexus Weapon even if Urainge says to hold off for now.)