The film's narrative follows Kael (Vin Diesel), a 500-year-old witch hunter who has dedicated his life to eradicating witches from the world. The story takes place in modern-day Krakow, Poland, where Kael teams up with a witch named Diana (Rose Byrne) to stop a powerful witch queen, Alex (Rachel Shealy), from unleashing a devastating evil on humanity. The narrative structure is straightforward, with a clear hero's journey arc that guides Kael's character development.