Definition
**Falling Red (落红)**: In Daoist ritual and folk belief, menstrual blood is often treated as a potent form of “yin impurity” that can neutralize or alter the properties of elixirs, talismans, and spiritual objects. Li Huowang uses this taboo as a shield—a brilliant inversion of real-world superstition into a survival tactic. It’s worth noting that this is a very specific, often overlooked piece of folk knowledge, and the fact that Li Huowang remembers it from his own world underlines his unique advantage.