This quest is not available in game.
Archmage Timear in Dalaran wants you to slay 7 Ymirjar Berserkers.
- Kill Ymirjar Berserker × 7
King Ymiron's champions stand between you and victory in the not-too-distant future.
You will travel to the fortress known as Utgarde Pinnacle nestled deep within the woods of the Howling Fjord. I cannot stress how important it is that you and your traveling companions deal with the Ymirjar berserkers therein.
Failure to do so may very well doom you, <name>!