Artificial Selection: A bio grimdark romantasy (Daemon Progeny) by Danielle Kaheaku

She was supposed to save her kingdom. Instead, she uncovered a key that could end the world... again. Disguised as a knight to escape a doomed throne, Nadia was raised to believe in crowns, honor, and sacrifice. But beneath the rituals of a feudal kingdom lies the rot of an old world—genetic engineering, weaponized bloodlines, and demons born not of myth, but design. The monsters that stalk the land are not curses from the gods. They are the remnants of a civilization that learned how to reshape life… and lost control of what it created. As Nadia is pulled deeper into the truth of what her world was built on, she becomes entangled with two men whose loyalty comes at a dangerous cost: a king whose claim is as suffocating as it is seductive, and a devoted monster whose devotion could burn the world to ash for her sake. Hunted by those desperate to preserve the illusion of order, Nadia must decide whether to uphold a broken system—or tear it down completely. Artificial Selection is a grimdark romantasy of engineered demons, corrupt power, and a heroine who refuses to wear the mask she was born into—even when choosing herself means setting the world on fire. Read more