If you're unfamiliar with this epic quest line which was once required to enter the Tempest Keep raid instance, it all begins in Shadowmoon Valley. The very first quest is called "The Hand of Gul'dan" and can be picked up in your faction's main town of the zone (Shadowmoon Village for Horde and Wildhammer Stronghold for Alliance). About 25 steps into the chain (I told you it was epic) you'll unlock new quests from A'dal in the center of Shattrath. For many players this is where the challenge truly begins as you must venture into four of the more difficult heroic instances to complete these quests. The final step involves killing Magtheridon in a 25-player raid, after which you'll finally be deemed a "Champion of the Naaru". Good luck!