[[caption-width-right:259:[[{{Pun}} Too hot to handle]].]]
A hot blade is an edged weapon that somehow heats up, adding the thermal energy of its temperature to the kinetic energy of its blow to achieve AbsurdCuttingPower. When active, it will usually glow visibly (without losing any of its structural integrity, [[MST3kMantra somehow]]) because PowerGlows.

Compare {{Vibroweapon}}, which uses extremely rapid vibrations instead of heat to enhance its cutting power. A more advanced weapon is the LaserBlade, where the blade is ''made'' of PureEnergy instead of just adding (heat) energy to a physical blade. Hot blades are more common in a ScienceFiction setting. Its more {{fantasy}}-oriented counterpart is the FlamingSword; a hot blade retains a touch of PlayingWithFire while requiring less WillingSuspensionOfDisbelief.

Usually used with [[SwordTropes swords]], but other bladed weapons are also seen occasionally. A subtrope of AbsurdCuttingPower. Unrelated to the idiom "like a hot knife through butter"... though hot blades may, indeed, cut through things in such a manner.



[[folder: Anime and manga ]]

* In the ''Franchise/{{Gundam}}'' franchise, the next step down from EnergyWeapons like beam sabers is heat weapons, the most iconic of which is the [[Anime/MobileSuitGundam Zaku II's]] heat hawk. Another well-known example is [[Anime/MobileSuitGundamWing Gundam Sandrock's]] heat shotels, which become [[{{BFS}} ludicrously huge]] in ''[[TheMovie Endless Waltz]]''.
** At one point in [[Anime/MobileSuitGundam the original series]], a heat hawk is able to briefly parry the Gundam's [[LaserBlade beam saber]], which is formed from superheated plasma. You think its [[FridgeBrilliance Because a heat hawk blade would by necessity have a higher melting point than the Zaku's armor]] before you know that the AllThereInTheManual tells you the blade of the heat weapon is actually plasmarized and maintained its form.(Thus they are just lesser example of beam weapons with lower tech)
* In the battle at the sea in ''{{Manga/Berserk}}'', Schierke's fire magic was used to turn Guts' [[{{BFS}} Dragonslayer]] into one of these.
* ''Manga/{{Bleach}}''
** FillerVillain Shusuke Amagai's Zankpaktou has this when its hilt [[FlamingSword spouts flame]].
** Captain Yamamoto's Bankai Seems to be this, along with a fullbody flame armor. Both of which are ''as hot as the sun''.
* In ''OnePiece'' [[ShockAndAwe Enel]] does a variation by using his electric powers to turn his trident into molten metal in order to burn [[RubberMan Luffy]], who's immune to direct attack by Enel's lightning.
* ''{{Yaiba}}'' has Gold, who can apparently heat up his gargantuan SinisterScimitar somehow. However he does this once.


[[folder: Fan Works ]]

* ''Roleplay/CityOfChains'' has ''Everburn,'' Lucien's two-handed [[{{BFS}} sword]]. Despite the name, it is this and not a FlamingSword.
* ''FanFic/Tech10Rebooted'' has the Pyronaut Blade, an alien weapon that can pierce through most armor when at full temperature.


[[folder: Film ]]

* Optimus Prime from the ''Film/{{Transformers}}'' movies uses some of these to cut Decepticon's heads clean off.
* In the first ''PiratesOfTheCaribbean'' film, after Will [[ThrowingYourSwordAlwaysWorks uses his sword]] to jam the door of the smithy and cut off Jack's escape route, he grabs a replacement out of the forge. It looks impressively glowy but doesn't last very long; fortunately there are plenty more on the racks.
* ''Film/TheHitchhikersGuideToTheGalaxy'' has a throwaway gag about a knife that toasts bread while slicing it.
* In ''Film/TheWolverine'' The Silver Samurai was able to cut Wolverine's admantium-coated claws with a superheated Adamantium sword. Since Adamantium suffers from a LikeCannotCutLike rule, presumably the intense heat melts the claws off.


[[folder: Literature ]]

* The Warpsword of Khaine from ''Literature/MalusDarkblade'' is said to feel like it just came out of the forge, and it burns whatever it hits.
* In ''Literature/CodexAlera'' many of the High Lords firecraft their swords, because a bleeding wound can be watercrafted better easily enough, but a cauterized wound is unhealable. Since this causes their swords to shine brightly, they also use them to send signals and challenges that can be seen across the chaos of a battle.


[[folder: Live-Action Television ]]

* In ''Series/{{Supergirl 2015}}'', Vartox wields a red hot axe that can cut a Kryptonian. Ironically, Supergirl destroys it by blasting it with heat vision until it can't take the strain and explodes.


[[folder: Tabletop Games ]]

* Many Warhammer swords (at least in the way they are visually depicted), both ''WarhammerFantasy'' (Archaon) and ''TabletopGame/{{Warhammer 40000}}'' ('''THE GOD-EMPEROR OF MANKIND'''), even when some flames might flicker depending on the artist, verging into FlamingSword territory.
* ''TabletopGame/MutantChronicles.''
* ''TabletopGame/CallOfCthulhu'' supplement Cthulhu Companion, adventure "Valley of the Four Shrines". The East shrine is dedicated to Cthugha, a deity made of fire. A sword found in a secret room can be made to glow yellow-hot, which will do damage to creatures vulnerable to fire.
* ''TabletopGame/{{Exalted}}'': A Malfeas charm turns a blade too burning hot ''[[InvertedTrope to be wielded]]'', forcing your enemy to either drop it or suffer lethal damage. Another version of this charm targets armor instead... and it's not easy taking off your armor during a (heh) heated battle.
* And of course ''TabletopGame/DungeonsAndDragons'' is full of these. As well as (among others) [[ShockAndAwe lightning]] and [[AnIcePerson cold]] versions. Not restricted to bladed weapons, though...
* ''1001 Science Fiction Weapons'' for D20, by Plain Brown Wrapper Games, also has a section on superheated blades. Various blades are used, including a [[SinisterScythe scythe]]; though unlike the supercooled weapons available in the book, the superheated scythe is not useful for non-combat reaping of wheat as the crop is set on fire. It is stated that if you see one of these hanging on the wall, you're probably dealing with a villain.


[[folder: Video Games ]]

* The Heated Cosmic Knife from the Dead Money expansion of ''VideoGame/FalloutNewVegas'' is this. It's an indestructible AbsurdlySharpBlade that has been heated with a heating pad and apparently retains its heat for a ridiculous amount of time, giving it even more destroying power.
** There is also the Saturnite Fist in ''Old World Blues'' dlc. Just give it to the crazy toaster in Big MT and it will become the Saturnite Fist Superheated which glows red hot and sets enemies on fire. A wonder how you [[ConvectionSchmonvection don't burn your own hand]] while wearing it.
** The base game has the Thermic Lance.
* One of the bosses from ''VideoGame/ChronoCross'' uses a {{Steampunk}} version (a NighInvulnerable, HumongousMecha), but this is technically a fantasy setting.
* The (in)famous Pyrotechnic Axes in ''VideoGame/ArcanumOfSteamworksAndMagickObscura'' presumably work this way. They're one of the strongest weapons in the game, assuming you're a melee-based technologist.
* VideoGame/{{Strider}} Hiryu's Cypher uses plasma to achieve this effect.
* Nero's Red Queen from ''VideoGame/DevilMayCry 4'' has a special mechanism inside it; the sword has a gasoline fuel inside, and the sword can be revved; when doing so, it sprays out the fuel to the blade as well as igniting it, making the blade glow hot red.
* Though they are not technically swords, the hooks thrown by Spider Splicers in the ''VideoGame/BioShock'' games are glowing red hot. They are probably heated by plasmid use on the part of the splicers.
* The Thermic Lances in ''VideoGame/{{X-Com}} 2'' are a combination of Hot Blade and {{Vibroweapon}}, and are pretty effective against the [[DemonicSpiders Demonic Crabs]]. [[note]]Ok, they are actually lobsters.[[/note]]
* The [[http://masseffect.wikia.com/wiki/Omni-blade#Omni-Tool_Weapons Omni-blade]] in ''VideoGame/MassEffect3'', the hologram is so the user doesn't accidentally burn themself.
* In ''VideoGame/MetalGearRisingRevengeance'', LQ-84-series [=UGs=] can throw superheated knives that are able to penetrate (and partially melt) stone and metal. Perhaps notably, Sam's sword also has a distinct red blade but ''isn't'' a HotBlade; just an exceptional VibroWeapon. Sundowner's weapon also seems to count, as visible heat and steam can be seen as he slowly slices across the President's neck in the intro
* A variation from ''VideoGame/HalfLife2'': an [[AutomaticCrossbows electromechanical crossbow]] that launches red-hot ''rebar rods''.
* ''VideoGame/{{Warframe}}'' has the Heat Sword, Heat Dagger, and Dual Heat Sword (sword+dagger combo), which do fire damage on some of their special attacks. All of them have visibly red-orange blades with glowing segments. Grineer melee weapons like the Cleaver, Machete and Sheev also have red-hot powered blades.
* In ''VideoGame/SuperRobotWarsCompact2'', the Alt Eisen carries a "Heat Horn" mounted on its head and functions like the Heat Hawk of the Zaku II. When it's [[MidSeasonUpgrade rebuilt and upgraded]] into the Alt Eisen Riese, the weapon is turned into the "Plasma Horn", with an additional feature of ShockAndAwe.
* [[VideoGame/GuiltyGear Sol Badguy's]] Fireseal(and it's upgrade, Junkyard Dog) allows him to channel his flame powers better. It also allows him to cut with it, despite the blade part being a blunt rectangle.


[[folder: Western Animation ]]

* WesternAnimation/{{SheZow}}'s EvilTwin [=SheZap=] has a curling iron that combines this with LaserBlade.


[[folder: Real life ]]

* [[http://www.webcitation.org/query?url=http://tribune.com.pk/story/219719/excorcism-16-year-old-tortured-with-hot-knives/&date=2011-07-29 Sufi tortures a 16-year-old boy with hot knives in order to "exorcise" him]].
* Heated blades have been used for [[HealItWithFire crude amputations to cauterize and disinfect the wound]].
* Actually not a good idea in real life, even if it were feasible; as any blacksmith or metalworker can attest, steel loses its hardness the closer it gets to its melting point. It'd take some very special metallurgy for the material to both glow white-hot ''and'' still be viable as a hard cutting edge.
* There once was a practice called "Blood Tempering," in which a red-hot blade is inserted by stab-wound and/or anally into a slave or prisoner of war, as it would cool the sword at body-temperature. This supposedly made the blades much stronger, and always killed the stab victim in practice.