Nordrassil, meaning "crown of the heavens" in Darnassian, is the original World Tree of the night elves, located on the new Well of Eternity, atop Mount Hyjal. It granted the elves immortality, and allowed the druids to enter the Emerald Dream, until the Battle of Mount Hyjal, which removed those blessings.
The tree was also blessed by Ysera to allow the druids entry into the Emerald Dream, since their powers were fueled by nature they could help her protect nature itself within her realm since that is the true purpose of the Emerald Dream. It seems that the druids may have never needed the tree to do this since they can still enter it, even after the tree was damaged enough to remove her blessing. Also, according to War of the Ancients, Malfurion Stormrage was able to enter the Emerald Dream before Nordrassil was created.
But the most important blessing came from Nozdormu, which ensured that so long as the tree existed the night elves would remain immortal. This would ensure that even the most corrupt of night elves would be drawn to protect the tree.
During the Battle of Mount Hyjal, Malfurion Stormrage blew on the Horn of Cenarius to summon forth hundreds of nature spirits to defeat Archimonde, thereby sacrificing the night elves' immortality and causing a devastating shockwave. While the tree's roots appeared to be healing, when last seen, it is clear that its connection to the night elves is gone. Fandral Staghelm led the creation of Teldrassil, which has proven far less powerful and successful than Nordrassil.
This section concerns content exclusive to Cataclysm.
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In World of Warcraft: Cataclysm, Nordrassil is now fully grown, but the elemental Lord Ragnaros has set his forces to attack the tree with the goal to burn and destroy. Malfurion, having returned from the Emerald Dream, along with the armies of Cenarius are defending the World Tree.
In the RPG
The key point of interest on Hyjal is Nordrassil, the World Tree. It stands thousands of feet high, and its vast canopy almost blocks out the sky. Although the tree suffered much damage in the Third War, it is healing itself. It did not flower or grow leaves the year past the war, but the druids hoped that the coming year it would begin to grow again. Guarded by three dragonflights, the World Tree Nordrassil is slowly regrowing. The bones of Archimonde, the great demon lord who led the invasion of Azeroth in the Third War, still hang from the massive tree’s mighty branches. Many speculate that when the tree regrows completely, the night elves will regain their immortality; but that day may never come if they fail to assist the dragons against the continuing threat of the Burning Legion.
- Nordrassil, the World Tree is almost certainly a reference to the World Tree of Norse mythology, Yggdrasil. Their names are similar, they both have wells underneath them: the Well of Eternity beneath Nordrassil, and the Well of Urd beneath one of the roots of Yggdrasil. Also Nidhoggr, a dragon, gnawed at the roots of Yggdrasil, which could reference back to either Deathwing or Archimonde. These parallels only apply to Nordrassil, the "true" World Tree, and not Teldrassil, the "false" one.