I have seen a few topics on not being able to receive the quest No Pain, No Agravaine in order to receive Mana Burn. But the answer was always that thr spell from wintertusk is required first. I already have both my spells from that area (diffuse and availing hands) and I went back to Gold paws in Olde town and looked around Northgaurd again but there are no new quest from any of them as well. I am lvl 74 and only trying for the 72 quest. I also have completed the A Very Brave and Noble Thing quest which is what was said to be a required prequest as well.