"Who, WHAT are you?" *main story spoilers*

[Cilia]

I'm going to add a little fuel to this fire...

... while the Quest Log for "The Burdens We Bear" does simply state Thordan looked on in disbelief at his slayer, a couple other bosses have done the same after we survived their supers since. Not Nidhogg, since we did have half of Hraesvelgr's power, but...

Thou hast dimmed my limitless light... what power of death do you mortals wield?

I have supped on the power of the Void! What ungodly power swims in your veins?

Need to think about it...