Sabae thought that Kanderon and Alustin used her and her friends as bait for the demon Bakori, but it turns out that Bakori was not really considered a serious threat. Kanderon and Alustin admit they were wrong about that but they were actually busy preparing for a far worse threat. Given that hundreds of students and most of Skyhold's powerful council died to Bakori, that's saying something. No one knows why the ancient Ithos Empire that once conquered the entire continent suddenly fell apart hundreds of years ago. It fell because they killed the mate and children of a young sphinx named Kanderon who then used her crystal and planar affinities to create what she calls the Splinter, which exiled the capitol of Ithos to a far distant world. She knew it wouldn't last forever but hoped the population would die before the Splinter ran out of power and the city returned. There's no way of knowing when it will reappear, but more than one faction wants to be there when it does. An Empire that opposes the Great Powers like Kanderon wants both the Splinter as well as the Ithos weapon known as the Tongue-Eater. Unfortunately Ithos poses a far greater danger than those powerful items. Kanderon later learned of a race known as the Cold Minds, that devour whole worlds in an effort to escape death. When Ithos returns there is a good chance it will bring the Cold Minds with it, and they devour whole worlds.
The Lost City of Ithos - its return might be the end of the world (Mage Errant 4)