Been playing with my mid level (lvl 47) champ up in the misty mountains and I just plowed through about seven elite mammoths (lvl 43ish) to get those three tusk rings in berserker mode. I only came close to dying once, when one of those elite trolls added. I was able to finish off the mammoth and scarper before the troll took out my last 80 moral. Switched over to AoE mode and ran into the dragon nest over in the west part of the Misty Mountains, intentionally sucking in about a half dozen worms (lvl 48) and AoE mode ate those baby dragons for brunch (including the two extra worms that wandered into the fray).
Consider me encouraged.