The Arbiter of the Chosen

"'Tyria as we know it, will reset. You may choose. Either oppose the fate that it's supposed to succumb to, or perish along with it.' - The Arbiter to the Protagonists in the Realm of Dreams."The Arbiter of the Chosen made his first appearance in the Realm of Dreams. Proposing to the Protagonists a choice to join the cause of the Chosen, to reset Tyria. Their goal is to start the world anew, with new civilizations that strive for world peace, by eradicating the known races.

For this, he requires the Six Amulets, which they've also seen in the Realm of Dreams. Unfortunately, nothing more is known about him or the Amulets.