TheHero is doing his usual thing: battering {{mooks}} left and right with his trusty Phlebotinum Sword and leaving them out cold. Except for that one mook who he clearly just gutted. With the same sword and with the same moves. How?

[[MST3KMantra Because we said so. That's why.]]

This trope is all about weapons or attacks that seem to jump between lethal and [[NonlethalWarfare non-lethal]] as the plot demands. They throw one, and it cuts through a steel cable, next throw, it knocks someone out without even drawing blood. No explanation as to why said weapon's killing power seems to come and go. It simply does.

Compare with InverseLawOfUtilityAndLethality and InverseLawOfSharpnessAndAccuracy. Contrast with StunGuns, which are something a bit different, and NerfArm. See also: BloodlessCarnage, CouldHaveBeenMessy.

When the lethality varies depending on ''who'' it hits, that's AlmostLethalWeapons.

For a specific video game version, see SetSwordsToStun.


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!!Examples:

[[foldercontrol]]

[[folder:{{Anime}} and {{Manga}}]]
* The ''[[Anime/ScienceNinjaTeamGatchaman Gatchaman]]'' weapons qualify. Sometimes depicted as lethal, sometimes not. The only two that had definite lethal variations were Jun's yo-yos, which could be turned into bombs; and Jinpei's bolos, which could be loaded with timed explosives.
* [[JustifiedTrope Justified]] in ''MagicalGirlLyricalNanoha'', most notably in ''[[MagicalGirlLyricalNanohaStrikerS StrikerS]]''. Everyone uses 'magic bullets', which are explicitly stated to be as lethal as they need to be -- that being one of the reasons why Mid-Childa outlawed old-fashioned 'slug-thrower' weapons and became a magic-driven society. Thanks to that, Nanoha is able to repeatedly pull off her signature 'befriend by superior firepower' trick without worrying about accidentally killing someone...
* In ''Manga/OnePiece'', it's stated that the best [[MasterSwordsman swordsmen]] can do this: strike a sheet of paper or a tree branch harmlessly, yet cut rocks or even steel the next second. Namely, when a swordsman gains the ability to "hear the breath of all things", they can use it to harm only the things that they want to harm, while leaving what they don't want to destroy untouched (Zoro's sensei managed to slice at a sheet of paper without damaging it, and Zoro himself swipes his sword through a branch full of leaves without harming a thing when he figures it out). This is important because being able to do it is necessary for being able to cut steel. Zoro reaches this level during [[spoiler:his battle against Mr 1]] in the Alabasta arc.
* ''MedakaBox'': Nienami, one of [[spoiler: Medaka's suitors]], is capable of cutting a battleship in half with her sword abilities. Yet in her fight against Zenkichi, she only succeeds in cutting him up a bit.
** [[BadAss Well, obviously, Zenkichi]] [[StrongFleshWeakSteel is tougher than a battleship.]]
** Later, this is revealed to be a result of Nienami's style, which [[spoiler: gives the least possible outcome.]] Zenkichi was considered the weakest of the student council [[spoiler: but paradoxically had the greatest chance of winning.]]
* ''Manga/RurouniKenshin'': Kenshin almost kills Seijuro with the Amakakeru Ryu no Hirameki, only sparing him because [[DeusExMachina some bolts on his sword gave way]], lessening the blow. Kenshin never comes close to doing that kind of damage with the move again, even though his subsequent enemies were far physically weaker than Seijuro. Justified somewhat as it's explicitly said that Kenshin must be ''very'' careful with that attack.
* In ''LightNovel/{{Durarara}}'', Celty can manifest a massive scythe that can cut through anything she chooses, possibly including souls. However, she's the nicest character on the show, so when she cuts people, they just fall unconscious.
* In ''Anime/KirbyOfTheStars'', Kirby's Crash ability does not harm his friends, only demon beasts.
* ''Manga/KamuiDen'': Many characters use a technique called "mine-uchi" (striking an oponent with the blunt side of the blade) to knock out their foes: [[spoiler: Nishiki Tanba does it to Ryunoshin; Ryunoshin in turn uses it on a whole mob of wayward samurai. Conversely, Atena's failure to perform a non-lethal mine-uchi on an unruly peasant gets her killed by an angry mob.]]
* In ''Anime/HighschoolDxD'', Kiba's Sword Birth only seems to be effective against mooks, that is when he actually uses it.
** Then again, one could argue the fact that the reason why is because Sword Birth makes bastardized versions of actual demonic swords.
[[/folder]]

[[folder:ComicBooks]]
* CaptainAmerica's shield is like this, DependingOnTheAuthor. Sometimes the edges are portrayed as razor sharp, other times blunted.
* NikolaiDante's [[ImpossiblyCoolWeapon Huntsman 5000 rifle]] is like this. It fires the optimum ammunition to eliminate its target at any time, but Nikolai's used it to shoot to wound on occasion.
* ComicBook/{{Hawkeye}} 's arrows and his way of using them. Though traditionally Hawkeye abhors killing, in later years he has become a victim of the "darker and edgier" trend of superheroes. In his most recent appearances, however, Hawkeye tries to avoid killing people, but doesn't flinch at leaving his enemies paralyzed, perhaps for life.
* [[Franchise/{{Batman}} Batarangs]] qualify, at times sharp enough to cut steel, other times they only knock you out. Occasionally they blow up in your face.
** Batman probably does have more than one type.
*** ''VideoGame/BatmanArkhamAsylum'' does give you multiple types of Batarang, one of which will short circuit the electronic collars the goons are wearing.
** A diagram in one book showed that the front "round part" is hard and blunt, perfect for knocking thugs out. The back part with all the spiky bits is razor sharp. Batman can throw it so that whichever end he wants strikes the target.
* Justified in ''Comicbook/ThePunisherPurgatory''. Punisher [[EmpoweredBadassNormal has been granted]] with divine weaponry which respond to his thoughts, making him able to just point and shoot as he pleases.
[[/folder]]

[[folder:Film]]
* ''Film/CaptainAmericaTheWinterSoldier'' sees Cap's thrown shield knock out regular humans with no visible blood or cuts and break through the solid metal body of a VTOL S.H.I.E.L.D plane.
* ''Film/SpiderMan3'' has the Green Goblin's pumpkin bombs, which alternate between knocking Harry out, giving him amnesia, and vaporizing Venom.
[[/folder]]

[[folder:{{Literature}}]]
* The titular ''SwordOfTruth'' works this way - the sword can only cut if the wielder believes the target is an enemy [[spoiler:except in its super-mode that he unlocks near the end of the first book]]. The [[AWizardDidIt wizard]] who gave Richard the sword stresses that the user doesn't have to be ''right'' in their beliefs, they merely have to believe. Which is why wizards agonize over who gets the title that the sword goes with.
* Deconstructed in ''Literature/NightWatch''. The "White Blade" is a powerful Light Side spell, that forms a blazing sword that is supposed to only harm evil people. On practice, however, "you'd have to spend a decade meditating and aspiring for inner peace before the blade would spare you". So when the heroes are assaulted by a bunch of Mind controlled human puppets, and one of the younger mages uses the Blade, it mows down the humans, and the mage cannot bear with what he's done and dies.
[[/folder]]

[[folder:LiveActionTelevision]]
* ''XenaWarriorPrincess'': Xena's chakram is the TropeCodifier. It killed enemies or knocked them out, according to RuleOfDrama... occasionally in the same episode. Occasionally in the same ''throw''. (Though it was always lethal if she used it as a melee weapon.) It's usually used as a non-lethal PrecisionGuidedBoomerang, but on occasion, we've seen it cut through rope, wood and human body parts. Callisto managed to throw it hard enough to ''go through Xena's sheathed sword and into her back.'' Many fans simply figure that there's a button, somewhere on the chakram, that turns it sharp.
* ''Franchise/StarTrek'' phasers justify this with having multiple intensities, including a stun setting. Although some have noticed a tendency, regardless of other circumstances, for the lethality of phasers to be inversely proportional to the importance of the character they're being fired at.
* Used in-universe with the "zat guns" of ''Series/StargateSG1'': one shot stuns, two shots kill, [[CanonDiscontinuity three shots disintegrate]].
* Egregious use in ''{{Super Sentai}}/{{Power Rangers}}'' where in one case a bunch of "monstrous" villains were killed but the few human-looking ones were turned good, by the same same attack blast.
** Going hand and hand with StrongAsTheyNeedToBe, a monster or villain making its debut will straight NoSell the hero's weapon or FinishingMove, and yet can hurt even flat out killed by the same thing they shrugged off in later appearences.
* ''Series/LegendOfTheSeeker'': The Dakras wielded by the Sisters of the Light and of the Dark. Their lethality is directly proportional to whom they hit: If it hits a Sister of the Dark, she's dead before she hits the ground. If it hits a main character, the thrower will have to release its magic to make the kill. In the latter case, the Dakra can be removed without any ill effects, even if it was previously embedded in the character's ribs.
* ''TheHeroYoshihikoAndTheDevilKingsCastle'': Yoshihiko's sword, the Sword of Beckoning, will render any humans it cuts unconscious without harming them, while still being able to actually harm and slay monsters.
[[/folder]]

[[folder:Roleplay]]
* ''RolePlay/WeAreOurAvatars'': [[https://www.dropbox.com/s/ei1zmd4ccih7ue1/Deathless.jpg Deathless]]. Said [[CoolSword sword]] is made entirely out of unnatural darkness, and can be lethal or nonlethal, due to how it cuts.[[note]]If it's nonlethal, then all damage done to someone with the sword is done to the person's shadow, and making the person feel a severe cold where the cut was made. The worse the cut is, the colder it feels, making normally fatal cuts incapacitatingly cold. Making it lethal requires a trigger word, which makes all the previously nonlethal cuts happen all at once.[[/note]]
[[/folder]]

[[folder:TabletopGames]]
* ''TabletopGame/DungeonsAndDragons'' has merciful weapons that are enchanted to deal an extra 1d6 damage, but have all the damage nonlethal. This ability can be switched on and off as a free action, and KO'd enemies can be killed at your leisure, so there's not even a drawback. Other weapons can be used to deal nonlethal damage, but at a penalty to accuracy. And just to round out the trope, normally nonlethal weapons can take this same accuracy penalty to deal lethal damage.
** The game usually does this with its abstract combat system, varying the method with each edition. In 4th edition, the final attack is supposed to declare whether it was meant to be lethal or nonlethal.
** In the [[BaseBreaker 4th Edition]] you can declare any attack to be retroactively non-lethal, up to and including a ''disintegrate'' spell.
* In ''TabletopGame/WerewolfTheApocalypse'', the Children of Gaia, a tribe of pacifists, have a spell that somehow turns their teeth and claws into nonlethal damage, allowing them to take down enemies with full force but avoid killing them.
* The Fate system, as used in ''TabletopGame/TheDresdenFiles'' (and in an earlier incarnation in ''TabletopGame/SpiritOfTheCentury''), formalizes this -- the worst thing that can happen to a character in a conflict, including combat, is that they end up Taken Out, which then lets their attacker describe ''how'' they were removed from the action. Thus, the outcome certainly ''can'' be fatal, but death is never mandatory.
[[/folder]]

[[folder:VideoGames]]
* The Crusader's Crossbow equippable by the Medic in ''VideoGame/TeamFortress2'' heals allies and damages enemies. Which makes it hilarious to fire into the melee on the 3rd point in Medieval Mode.
* The eponymous [[VideoGame/FireEmblemElibe Sword of Seals]] is, evidently, only as strong as the resolve of its wielder. When Hartmut, one of the generals of [[GreatOffscreenWar The Scouring]], found that the leader of the dragons had assumed the form of a frail girl, he didn't have the heart to kill her outright, opting instead to knock her out with the sword, and sealing her away.
* ''VideoGame/FinalFantasyVI'' has the Ultima Weapon, a sword that has the highest possible attack power (255), but does damage based on its wielder's current HP. It also has the Valiant Knife, which works in reverse - it grows stronger as the difference between the wielder's current HP and max HP gets bigger.
* ''VideoGame/FinalFantasyIX'':
** While all weapons have a random generator that modifies damage to a small degree, Quina's forks deal wildly fluctuating damage.
** Beatrix's Climhazzard and Stock Break attacks freely switch between doing normal damage and doing exactly enough damage to set HPToOne depending purely on the story.
* Amaterasu's Power Slash ability in ''{{Okami}}'' can cleanly cut trees, boulders, diamonds, and various minor demons in half, but when performed on friendly [=NPCs=], it will simply knock them back.
* ''VideoGame/{{Prototype}}'': Why you cannot deal a fatal blow to Specialist Cross when you first encounter him, no matter what you do on his last sliver of health.
* ''VideoGame/KnightsOfTheOldRepublic'': The lightsabers. Although they are [[SwordOfPlotAdvancement extremely powerful weapons]] in both games (arguably the ''only'' powerful weapons in the first one), they generally do ''not'' behave like the lightsabers of the traditional Star Wars lore. They are more like normal swords, possibly to avoid the GameBreaker status. Possibly justified through the use of "cortosis", a material which blocks lightsabers. Presumably, the overuse of cortosis in this era rendered it rare by the time of the movies.
* ''VideoGame/{{Oddworld}}: Stranger's Wrath'': The difference between killing someone with Thudslugs, punches or Zappflies and knocking them out is that a KO takes less damage. Stingbees and Fuzzles are always deadly, however.
* ''VideoGame/{{Xenoblade}}'': The Monado is incapable of cutting sentient beings born from the Bionis [[spoiler: (At least for a while).]]
[[/folder]]

[[folder:WesternAnimation]]
* ''WesternAnimation/AvengersEarthsMightiestHeroes'': Wasp's stings are usually portrayed as annoying BeamSpam at best. But during the five-part pilot, she manages to whip off a blast that cut a railroad car in half (a railroad car that was being thrown through the air right at her). It didn't even seem to be a matter of concentration or energy use, because she went right back to her normal BeamSpam right afterward.
* ''ThundarrTheBarbarian'''s [[LaserSword Sun Sword]] could cut through inanimate objects and MechaMooks as if they were tissue paper. But the moment he tried to strike down a living foe, the Sun Sword inexplicably didn't work. (At least the writers lampshaded this by having Thundarr express surprise, dismay or both at this.)
* ''WesternAnimation/TransformersTheMovie'': In some scenes transformers die from one hit by even pistol-sized laser guns, but in other scenes they are just knocked down (like Starscream during the battle for Autobot City) or even simply shrug them off (like Optimus Prime in the same battle).
** ''WesternAnimation/TransformersPrime'' sometimes run into this with characters built in guns. Typically they didn't do any significant damage, except against [[RedShirt Vehicons]], but in one instance [[spoiler: Megatron's arm cannon is enough to kill Dreadwing with a single shot, and is '''NEVER''' presented as being that powerful again.]]
* Sokka's boomerang in ''WesternAnimation/AvatarTheLastAirbender'' is similar to the above Batman example. While it is used to cut and knock out, Sokka is often shown to be sharpening one edge of it while leaving the other edge dull. It can be assumed he chooses which side to throw it on.
** Earthbending rather infamously had this applied when Jet was injured fatally by Long Feng, because every other time somebody is hit with a rock thrown via Earthbending it doesn't do any lasting damage.
** In the sequel ''Series/{{Legend Of Korra}}'', [[EldritchAbomination Vaatu]]'s laser attack, It's frequently seen blasting through rock, and yet human beings can survive it without any significant injury.
* WesternAnimation/SamuraiJack has a magical sword which will not harm those pure of heart - on the occasion where it was used against him, it merely bounced off, and when stolen and used against others, the best it can do is knock people away.
* ''[[WesternAnimation/AdventuresOfTheGalaxyRangers Galaxy Rangers]]'' did a ''nice'' [[GettingCrapPastTheRadar dodge]] on this trope. Early on, [[TheCaptain Zachary]] would sometimes explicitly order his team to "set blasters for stun." Later in the series, when they were trying to score a toy deal, they had a crook say that Ranger blasters didn't have a kill setting. Now, seeing as the source of the information was a ''very'' [[UnreliableNarrator dumb crook]], the writers could both have the kid-friendly "stun only" mention on camera and a wink to the more likely prospect that there was a kill setting. Likewise, Crown blasters also had stun and kill settings, but it was justified in that the Queen wanted humans (or other compatable species) as fodder for [[FateWorseThanDeath the Psychocrypt]], and you couldn't drain LifeEnergy from dead enemies.
* In one episode of ''WesternAnimation/SpidermanTheAnimatedSeries'', Doctor Octopus crashes a public demonstration of "argon laser", gets the upper hand against Spider-Man's attempt to stop him, and turns the beam on Spidey as he pins the superhero to the wall -- only for Spider-Man to realize how the beam was [[JustifiedTrope specifically programmed]] to not harm organic matter; Spider-Man suffers only a little ClothingDamage as the beam lases across him before turning the tables and using it to slice off two of Doc Ock's four robotic arms.
* ''WesternAnimation/TheSpectacularSpiderMan'': Shocker can use the airblasts to punch through steel and tunnel through rock, yet they mainly just provide knockback on living targets.
* Identity Discs in ''WesternAnimation/TronUprising''. However, it's shown that they can thrown without activating the lethal cutting edge, for non-lethal sparring.
* Skeletor's Havoc Staff in the ''WesternAnimation/HeManAndTheMastersOfTheUniverse2002'' series. He's frequently blasted through rock with it, but nobody he blasts with it ever takes any real injuries.
[[/folder]]
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