Three months after exposing the conspiracy, Nyx has become a symbol of the new Luminara where light and shadow coexist. But peace is fragile. Assassins target newly marked citizens, and someone is spreading rumors that shadow magic corrupts over time, turning users into monsters. When Radiance discovers evidence of a secret organization called the Prism that's been manipulating both sides of the conflict for centuries, Nyx realizes the High Luminary was just a puppet. The real architects of shadow persecution are still hidden, still powerful, and now they're ready to eliminate anyone who threatens their control. With Vesper mysteriously disappearing and Solara falling ill to a curse designed specifically for shadow-marked, Nyx must venture beyond Luminara's walls to find the Prism's headquarters before they trigger a magical catastrophe that will justify reinstating the old persecution permanently.