One Speech

Laith aen Undon, in common roughly translated as One Speech, an language used by both Aen Seidhe and Aen Elle elves in times when they were united as Aen Undod. From this, oldest known speech later delivered renowned and thousandfold changed Hen llinge or for humans Elder Speech.

Trivia

 * Avallach, Ida Emean, Eredin, Yennefer and Ciri a bit known if not fully than some of this ancient tongue.