Lihonessa wrote:the Night Elves lost their immortality when the World Tree, Aldrassil, was destroyed at the end of Archimonde's invasion.
The new tree, Teldrassil, did not grant the Night Elves immortality, because Elune did not approve of it, just like Malfurion had forseen.
That tree Archimonde distroyed was called Nordrassil and was not distroyed! The tree still exists in Mount Hyjal and it was saved by Malfurion's plan to detonate the wisps on Archimonde himself. The tree was only damaged, but it was saved, though the Night Elves needed to move!
Don't think I say that because I saw it in The Battle Of Mount Hyjal, I say it because I read in WoWWiki and it is rumored that we will see Mount Hyjal (the territory) opened in the Emerald Dream expansion (the one following Wrath of the Lich King) as a starting area for a new Alliance race, the Furbologs of the Barkskin Tribe.
Now Aldrassil is the big tree in Shadowglen, the Night Elves' starting area!