Immortal No More

Immortal:Unable to die of old age Sword in head still hurtz

The night elves lost immortality because after the world tree was destroyed,Nozdormu (time dragon) didnt bless the new tree,Teldrassil, and he was the source of nelfs immortality (Wisps blew up Archimonde and that caused first tree(Nordrassil) to die(well a tree was before that but cant remember name( Edit:Oh I think its Aldrassil); Aviana,the demigoddess (Desceased, killed by doomguards in War of the ancients) lived in it with her bird minions))......sorry,my lore geek side took over.

Edits: Ok, to clear this up, first tree was Aldrassil, I think felled by BL in WotA, second tree was Nordrassil, from the seeds of Aldrassil it was planted and blessed by ALL the dragon aspects, but blew up because of Archimonde dying because of a zillion wisps on auto cast detonation.After, that git Staghelm planted a new tree, Teldrassil, but Nozdormu, the source of the night elfs immortality, didnt bless it, and wasnt properly blessed by the rest, so the residue corruption spread over it.

Don't match lotr with warcraft lore, don't even try :P