Consider what you have seen tonight as a warning. Monte d'Or will soon be destroyed. Those who submit to the power of the mask may be spared... But then again... They may not.
~ The Masked Gentleman.

Harbingers are messengers, a warning of things to come. They appear in many works of fiction and may embody abstract concepts or serve as a morality tale; some are simply heralds of higher authorities, all share the common trait of delivering some kind of message or revelation to a character.

Not all harbingers are malevolent; many are amoral, though some are more hostile or sinister in nature.