After wielding time itself to save the Rym, Antares and Magdavellía return to Agartha as heroes. But peace is short-lived. As a mystic-led sneak attack plunges the Rym into chaos, they once again find themselves in a world on the brink of doom. Their only hope is a forgotten alchemyst map that supposedly leads to the Elementals--powerful Ancient Astronaut substances that, when combined, create the ultimate instrument of destruction. Antares and Magdavellía will have to race against old and new enemies to secure the Elementals, even as a traitor in their midst plots their long-awaited revenge against the empress. But every step they take toward the forging of the ancient weapon brings them one step closer to uncovering a horrible secret from Magdavellía's past--a secret that could bring down her throne.