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Moral Event Horizon
Once he crosses that red line, there's no turning back.

"Tarkin, if ever there was a shred of humanity in you or these twisted creatures of yours, it's dead now. You're at war with life itself. You are enemies of the universe... your Empire is doomed."
Princess Leia Organa, from the Star Wars Radio Dramas, after Grand Moff Tarkin wipes out her home planet.

Named for the boundary around a black hole from which there is no escape once crossed, this trope uses the black hole as a metaphor for evil; the Moral Event Horizon refers to the first evil deed to prove a particular character to be irredeemably evil.

Note the word irredeemably. It is a demonstration of permanent evil; as in, the first evil deed whose role in the story is to tell us they will always be evil. That moment where you know for sure that it is simply not in their character to do something genuinely good and unselfish.

While they may not have had a term such as this to define it, many authors clearly recognized it. Robert A. Heinlein's Stranger in a Strange Land referred to it as being the result of an act that was "so bad, so black" that it was basically unforgivable. Hank Rearden in Ayn Rand's Atlas Shrugged said that "to convict a human being of that practice was a verdict of irrevocable damnation... a verdict of total evil" and that "he would not believe it of anyone, so long as the possibility of a doubt remained." Meanwhile, multiple religions have the concept of "perdition", where those who have committed a truly unpardonable sin are irrevocably doomed to damnation.

Obviously, it follows from the definition that a character can't cross this boundary more than once. Crossing it implies going from redeemable to irredeemable, and that's it; the other way around contradicts the definition. Note that this does not mean their morality is always decreasing after crossing this; a character can cross this, then become much more horrible than they were when they crossed it, then become just a little better than they were after that, but they will never, ever commit an act that redeems them entirely.

Sometimes all that stands between man and monster is a Single Tear... or even a full-out weep. Perhaps a show of respect for the enemy. A Heel Realization that you've gone too far is possible just as you're teetering on the edge of becoming a monstrosity - you've committed the act but you regret it. Characters who regret the act that would otherwise make them cross the line effectively become The Atoner. Just as with a real black hole, the closer you come to a Moral Event Horizon, the harder you must try to escape. Sometimes a character who has crossed the horizon will invoke I've Come Too Far afterwards.

Can lead to a Complete Monster, but crossing the Moral Event Horizon does not automatically imply a Complete Monster. The character can just be a bad person; the Moral Event Horizon is a black mark in their history that cannot be forgiven. A character who performs an act that should make them irredeemable but somehow gets away with it is a Karma Houdini.

Compare with:

Contrast with:


Examples:


Pet the DogPt/Índice de TraduçãoLame Pun Reaction
Love Makes You EvilHeel Face IndexMore than Mind Control
Shoot the DogJustForFun/Tropes of LegendKilled Off for Real
Mid-Season TwistSpoilered RottenMassive Multiplayer Scam
What Measure Is a Mook?Morality TropesMoral Luck
Monster SuitVillainsMorally Ambiguous Doctorate
Moment of AwesomeYMMV/Home PageMore Popular Spin-off
Moment of AwesomeYMMVMore Popular Spin-off
Mind-Control EyesImageSource/OtherMurder By Inaction
Mercy KillTear JerkerMy God, What Have I Done?
Monument Of Humiliation And DefeatEvil TropesMoral Myopia
Mark of the BeastObviously EvilNames to Run Away From Really Fast
Lowered Monster DifficultyCharacter DerailmentMotive Decay
Morality ChainAdministrivia/No Real Life Examples, Please!Morally Ambiguous Doctorate
Darker and EdgierOverdosed TropesWhat Could Have Been
I'm a HumanitarianSliding Scale of Antagonist VilenessArtifact of Doom

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