Just made an account to join in on the hunt.
I have a thought on the Frost artifact, I've only managed to read about half of the entire thread so if it's been suggested forgive me.
It was mentioned that Koltira has deciphered something in the past (Koltira and the Language of Death) Could it be possible we need to upgrade him to epic status to unlock his two equipment slots, then give him two relevant items and take him to a specific place that could trigger a quest?
That's my best theory so far.