The Eye of Eternity is located in Borean Tundra. If you don’t have a flying mount, you can take the flight path from Amber Ledge to Coldarra. Enter the nexus structure and enter the top portal. At least one player in your raid will need the Key to the Focusing Iris (10 man) or Heroic Key to the Focusing Iris (25 man) in order to summon the boss. Check out our guide on how to obtain both Keys to the Focusing Iris.