Yulia Morrison grew up among forgotten ruins and dark dungeons hidden at the heart of the world. Her parents—herbalists and healers—taught her the language of herbs, poisons, and diseases, and her curiosity about the dark arts knew no bounds. Even in her youth, Yulia showed a particular affinity for researching deadly substances and the magic of disease. When a mysterious epidemic broke out in their village, Yulia lost her entire family. In a desperate attempt to save her loved ones, she ventured into dangerous dungeons and ruins, where she discovered ancient manuscripts related to the control of poisons and diseases. There, she discovered the path to understanding secrets previously inaccessible to mortals—the art of inducing illness and controlling suffering.

Over time, Yulia became known as "The Plague Woman"—a mysterious specialist in poisons, diseases, and contagions. She became a keeper of ancient knowledge, aiding witches, hermits, and seekers of forbidden magic. Her hands are their weapons, for she knows how to transform poisons into deadly Lamentations, and how to turn disease into a weapon, defeating enemies or causing terrible torment. Her ministry is to explore underground labyrinths, forgotten catacombs, and dark crypts—places inhabited by sinister creatures and viruses. There, eternally surrounded by the stench of decay and the dim light of torches, Yulia seeks new pathogenic knowledge and sinister drugs to control death. Believing that truth lies in suffering and decay, "Plague Woman" walks the line between life and death. Her goal is to uncover the secrets of disease so that she can one day control death without fear or regret, for she knows that the truest knowledge—and the most terrifying—lies hidden in the very depths of darkness.