From TheWarWiki

"Let us never forget our ancient home, Nagarythe! Though our proud land was riven and broken by the magic of our despised kin, its legacy lives on in the might of our Black Arks and in the memory of our people.

"When the Witch King crushes the armies of the weak pretenders in Ulthuan, he will claim that victory in the name of Nagarythe, greatest of the ancient nations of the Elves and birthplace of the Druchii, the one true race of Elves.

- Asarith Palemoon, House Uthorin Keeper of Truths

Walkthrough

This is a proximity unlock in the Shadowlands. At (42k, 31k) there are some fallen masonry and a lvl 13 Champion, Elder Heradien, sitting against a wall. Approaching where he is will give the unlock.