At this moment this champion is still unkillable for me, just got beat down by him several times in a row and finally decided to look him up and found this forum on him. Now that I know he is actually broken right now I can relax, thought it was something I was doing wrong.
Just went full on Toughness/Healing at lv74 Guardian and im dead within 30seconds, NPCs are pretty much 1 shot lol