In the Obsidian Underworld, love is dangerous and desire can damn entire realms.Seraphine Hart has spent her life hiding what she is. A rare half-angel raised among humans, she was taught to suppress her power and fear the truth of her blood. When that power finally awakens, it rips open an ancient gateway and drags her into a realm of fire-lit castles and cursed shadows, straight into the domain of its ruler.Asheron, the Demon King of the Abyss, was born of primordial flame and prophecy. Ruthless, untouchable, and feared across the Underworld, he senses Sera the moment she crosses the veil. Something about her soul calls to him with an intensity he cannot ignore. She is tied to his fate, and to the survival of his kingdom.Trapped in a world that feeds on weakness, Sera resists the dark pull between them, terrified of what binding herself to a demon king could awaken inside her. The closer Asheron draws, the more her power responds, and the more dangerous their connection becomes.Yet the greatest threat is not always the one who rules.Vaelrik, the Demon King’s most trusted general, offers Sera protection and understanding. Behind his charm lies ruthless ambition and a hunger for power that could tear the Underworld apart. As alliances blur and loyalties fracture, Sera finds herself caught between a king who would burn the world to protect her and a man who sees her as the key to his rise.With the Underworld on the brink of chaos and her power spiraling beyond control, Sera must decide who to trust before everything collapses.Because in a realm built on fire and blood, choosing wrong does not just break a heart.It destroys worlds.