Avarin

In J. R. R. Tolkien's legendarium, the sundering of the Elves is the complex process in which the immortal Elves successively break up into many groups with multiple causes of dissent between them. They awoke at Cuiviénen on the continent of Middle-earth, where they were divided into three tribes: Minyar, Tatyar and Nelyar. After some time, they were summoned by Oromë to live with the Valar in Valinor, on Aman. That summoning and the Great Journey that followed split the Elves into two main groups, which were never fully reunited.