Robbed of the credit for saving a life by his stepbrother, cheated on publicly by his scumbag fiancé, and branded a “bastard” by his step-parents—pure-blood Moon-Tide Omega Selas is forced to take his stepbrother's place and marry the venomous monster of the Abyss, the creature whose very touch rots scales. Everyone expects him to die. But the moment he steps into the Abyss, the half-rotted “monster” steps out of the shadows and reveals half of a face so beautiful it seems unreal—he is the true heir of the Abyss, the top Alpha dethroned by poison. And Selas's Moon-Tide blood is the only thing in the world that can cure his venom. The tyrant pins him to the wall: “You're never leaving.” From sacrificial lamb to the queen guarded with the strongest Alpha's life, Selas rises—and when he stands over the world carrying a child of both bloodlines, the scumbag ex kneeling and begging for one last glance is already drowning in regret. Trash gets crushed, a possessive king protects, life-scales are surrendered, and life-and-death choices are made in the Bone Pool—the ultimate dark-romance fantasy in an ABO mermaid world.