Fan Casting Weakened by the Light in Sort by Tropes

Light is a powerful thing. Some enemies, especially living shadows and vampires, are weakened by it, if not outright destroyed. The reason is simple: Light Is Good + Good Hurts Evil + Dark Is Evil = Light Hurts Evil. Sunlight seems to be particularly potent, which gives Cue the Sun a whole new meaning for such nocturnal nasties. Works fond of Doing In the Wizard often explain this as an aversion to ultraviolet light.