Watcher's Observatory

The Demi-Realm created by the Watcher as there residence to keep safe from the vast many who sought to kill her. It's a large observatory used to interact with the realms passively for the most part. Few know of its existence or have ever stepped inside it, one of those few is Malthael. Malthael has imprisoned the Watcher for an unknown amount of time, they now hold The Eye of the Watcher.