Edge of Reality



The Edge of Reality is an otherworldly location to which retreats during his final stand following the events of Darkness Falls, and where he is killed by adventurers of the Alliance and the Horde.

Portals to the Edge of Reality also rarely spawn across, leading to The Last Voidtalon and the Voidtalon Egg which contains the Voidtalon of the Dark Star. The portals only allow one person through before they despawn, and will disappear if someone who already has the Voidtalon tries to enter.

Speculation
The exact location of the Edge of Reality is unknown.
 * Ner'zhul's quotes refer to it as "the realm of the Shadow Lands" and "the realm of death itself", implying that the Edge of Reality is located in the Shadowlands. Ner'zhul is also a powerful necromancer.
 * However, the Edge of Reality uses Void effects, and most of the storyline of the revolves around the Void and not the Shadowlands. It is also the location of the Voidtalon of the Dark Star. Moreover, Khadgar tells players who have failed to loot the egg in the Edge of Reality that they have misplaced it "in the void". It is thus possible that the term "Shadow Lands" employed by Ner'zhul was referring to the Void.
 * A third possibility is that it is located in the Twisting Nether as the quest The Void-Gate implies. The skybox used in the Edge of Reality is also used by the Void Totem toy, which is said to "weaken the barrier between this world and the Twisting Nether". This is likely because there was confusion during Warlords of Draenor between the Void and the Nether, with quests like the above or Through the Nether not making a distinction between them.