This quest is un-completable. Always at the same point in the route (Over the Flayer Layer at the top of the mountain) Mulveric ends up hitting himself w/ his attack and this causes the NPC to slow and then fly into the ground. Even when trailing the marker, I eventually get ‘too far away’ and fail the run. Have attempted this multiple times with the same result each time.
Sorry. Sometimes it does that for people who have three vowels in a row in their name.