When severed from the Ambar Tree Elves who pass from the material world who’s Soul is substantial may leave it behind as a grim visage which seeks a new Ogen so it might attempt to regain its Tether to the Ambar Tree. The strange nature of Elvish biology means that so long as a Naegra thûl does not stray more than 5 miles from its body, the heart of the elf will keep it anchored for several decades, before finally, the World Stone draws the Soul to its final resting place.