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[[caption-width-right:350:[[Franchise/{{Metroid}} TIME BOMB SET. GET OUT FAST!]]]]
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->''"That Witch has laid a train of magic spells so that whenever she was killed, at that same moment her whole kingdom would fall to pieces. She's the sort that wouldn't so much mind dying herself if she knew that the chap who killed her was going to be burned, or buried, or drowned five minutes later."''
-->-- '''Puddleglum''', ''Literature/TheSilverChair''

A boss-type monster whose destruction [[NoOntologicalInertia causes the location to self-destruct]] (see CollapsingLair). Usually results in a scene after the final battle wherein the player must make a hasty escape before [[TimedMission the clock runs out]].

Commonly happens with {{Final Boss}}es in {{R|olePlayingGame}}PGs and {{Metroidvania}}s.

Always seems a bit too contrived, though Terry Pratchett suggested in his first ''Literature/{{Discworld}}'' novel ''Discworld/TheColourOfMagic'' that this phenomenon was due to entropy (having been frightened away by the horrifying boss) making up for lost time. Or perhaps the lair simply has NoOntologicalInertia.

Can be {{justified|Trope}} by some form of DeadManSwitch or, in more fantasy/magical settings, by a literal bit of AWizardDidIt, in that the power of the BigBad is what originally put, and is currently holding, the place together, making his defeat somewhat like shutting off an electromagnet. Not related to LoadBearingHero, except in as much as he'll have to hold up the resulting CollapsingLair for his friends to escape.

Particularly large-scale examples may be a type of CosmicKeystone. ReactorBoss is a [[JustifiedTrope justified subtrope]]. Compare DefeatEqualsExplosion and BarrierMaiden. When a boss takes some final action to cause this sort of situation, its TakingYouWithMe.



[[folder:Anime & Manga]]
* In ''Anime/SailorMoon'', the destruction of the Kisenean Blossom leaves the senshi stranded on an asteroid on a collision course with the earth. In the third season, Mugen is destroyed by the battle and the senshi are buried beneath the rubble. They're OK, though.
* ''Manga/{{Bleach}}'': After Chad and Uryu defeat Demora and Iceringer, the room they are in collapses, having been designed to do so if they were defeated.
* [[spoiler:Atem/Yami Yugi]] plays this role in the last episode of ''Anime/YuGiOh''; after he is defeated in the Ceremonial Duel, the temple they're in begins to collapse.
* ''Manga/AngelSanctuary'' has hell beginning to collapse when Lucifer's body is killed. [[JustifiedTrope Justified]], it's established that hell was an unliveable place and Lucifer routed his body with the ground, so his body is practically the one thing holding hell together.
* In ''Manga/OnePiece'', Luffy's final kick against Arlong destroys Arlong Park, the building that they're in. In a filler arc, after Luffy defeats Don Atchino, his Atsu Atsu Fruit powers melt the Atchino family's iceberg base. In the Arlong case, this is because Luffy's final attack was to kick Arlong ''through'' the building; it wasn't so much that the building was destroyed because the boss died as it was because the boss was smashed through all five floors of it.
* In ''Anime/CodeGeass: Nightmare of Nunnally'', after Nunnally [[spoiler:rejects opening Heaven's Door in favor of "tomorrow," resulting in her parents being erased from existence like they were in the original series]], the cave in Kamine Island collapses.
* Very popular in ''Manga/SaintSeiya''. All of the OVA villains pull this one after being defeated, concluding with Seiya & Co. running for their lives.
** Athena herself is one in the anime version of the Hades chapter: when she [[spoiler: kills herself to attack Hades in his own domain]], the Saints all but states that the main part of the Sanctuary is about to collapse now that Athena's cosmo doesn't sustain it anymore, and that is still standing only because it was the only one built by men (meaning that Athena's cosmo was simply protecting it from the ravages of time instead of enabling its very existence).
* In ''Anime/MagicalGirlLyricalNanohaStrikers'', [[MadScientist Jail Scagletti's]] ElaborateUndergroundBase begins to collapse after [[spoiler:Fate kicks his ass with Sonic Form]]. [[spoiler: Averted]] not long after, as [[spoiler:Fate and Shari use the [[UnusualUserInterface control-panel-piano-thing]] to cancel the collapse.]]
* Played with in ''Anime/DaiGuard'', when the team find a dormant [[RentAZilla Heterodyne]] and wonder whether they should leave it be or destroy it before it wakes up. The eventually go with the former, which is good because while it was dormant it kept growing underground until its structure was holding up ''the entire Kyoto area'' and the only safe way to dispose of it was to wait until it eventually sank into the Earth's crust.
* The ailing Princess in the Kokuboro arc of ''Manga/{{Kekkaishi}}'' created the castle and alternate dimension that shares the name of that storyline; the castle gradually decays and eventually collapses as her health deteriorates, to the point where the whole dimension completely collapses when she ultimately expires.
* [[spoiler: Hakumen no Mono]] from ''Manga/UshioAndTora'' fits this trope perfectly. [[spoiler: If Ushio's mom lets up the barrier and allows the yōkai of Japan to kill him, all the islands of Japan will sink with him]]
* ''Anime/TengenToppaGurrenLagann'': When Simon [[spoiler: defeats Lordgenome in Episode 15, all the Gunmen being piloted by his mooks deactivate.]] More to the point, so does [[spoiler: the mountain-sized HumongousMecha they were fighting on top of, causing it to rapidly collapse under its own weight]]. Pops up again when [[spoiler:the Anti-Spiral are finally defeated. Not only does it destroy the enemy's galaxy-sized mecha, it also destroys their home planet and the very dimension they inhabited. ]]
* In ''Anime/{{Scryed}}'', defeating [[BigBad Kyoji Mujo]] caused the warped base to fall apart. {{Justified|Trope}} since it was being sustained with Kyoji's Alter Power, with him dead, there was nothing supporting it.
* In ''Anime/GaoGaiGar Final'', when the heroes [[spoiler: [[DropTheHammer use the Goldeon Crusher]] to kill Pisa Sol, the whole UNIVERSE falls apart. Thankfully they were in an alternate universe, but still!]]
* As the BigBad in the RockOpera ''Anime/{{Interstella5555}}'' dies his DisneyVillainDeath, the underground ritual chamber and his castle start to collapse, thus requiring Stella and her bandmates to run for their lives.
* In ''Anime/{{Gankutsuou}}'', [[spoiler:the Count]]'s headquarters begins collapsing seconds after he dies for no readily apparent reason.
* Defeating King in ''Manga/RaveMaster'' causes the tower the hero and his dad were fighting on to crumble. Their race to the bottom leads to a perfect DroppedABridgeOnHim moment. Except instead of a bridge what dropped was a...
* Subverted in the ''VideoGame/{{Wizardry}}'' OVA, where although Werdna's death causes much trembling throughout the dungeon, the heroes are able to wait it out and then walk out.
* ''Manga/{{Outlanders}}'' is a particularly egregious example, where the death of the [[spoiler:Santrov Emperor]] causes [[spoiler:the OrganicTechnology of]] the entire planet to [[UpToEleven collapse and die]].
* In ''Anime/SDGundamForce'', the death of Sazabi causes the [[EvilTowerOfOminousness Horn of War]] to collapse.
* ''LightNovel/VampireHunterD''. In the 1985 film, when Count Magnus Lee is killed his castle self-destructs. Something similar happens in ''Vampire Hunter D: Bloodlust''. Vampire castles apparently have NoOntologicalInertia.
* In the film version of ''Anime/SuperDimensionFortressMacross'', ''[[Anime/MacrossDoYouRememberLove Do You Remember Love?]]'', Golg Bodolzer himself is wired into his ship's computer. When the hero shoots him down, the rest of the ship quickly follows. Though in a bit of a variation, what actually seems to happen is Bodolzer's death causes a malfunction in the ship's [[FasterThanLightTravel Fold System]], causing random pieces of it to get teleported who-knows-where. Explosions happen as a result of this, and the ship is thoroughly wrecked, but its outer structure is still largely intact afterward.
* In the first ''Anime/TenchiMuyo'' OVA, Tenchi [[HalfTheManHeUsedToBe bisects]] [[BigBad Kagato]] in their climactic battle. Somehow this causes Kagato's gargantuan spaceship that they were fighting inside of to ''also'' be sliced in half.
* In the ''Anime/BlackRockShooter'' OVA, Dead Master's palace collapses when she is defeated.
* Discussed in the first ''Anime/DigimonTamers'' movie. No one believes Mephismon is dead because its pocket dimension isn't collapsing, and sure enough, it comes back as Gulfmon.

[[folder:Comic Books]]
* Invoked in ''ComicBook/GoldDigger'': Julia defeats a warlord who enslaved his own people to fuel his power by tangling him up in chains around the pillars holding up his throne room, then knocking them out in a way to leave him as the "keystone" holding the whole thing together. If he tries to move to attack or free himself, tens of thousands of tons of stone come tumbling down on his head. The only way to get free would be to ''beg'' his subjects to free him. The rival Julia [[SaveTheVillain came to rescue]] notes that said warlord is likely to let himself starve to death first.
* ComicBook/RedSonja easily defeats the evil wizard Kalas-ra, but he pulls his cavern fortress down around him as she sprints for the exit.
--> '''Sonja:''' I'll say this about wizards. They are very poor losers.

[[folder:Fan Works]]
* ''FanFic/TheImmortalGame'': After [[SuperpoweredEvilSide Nihilus]] is destroyed by the Elements of Harmony, her [[OminousFloatingCastle floating fortress]] disintegrates.
* ''FanFic/JewelOfDarkness'': After Midnight is defeated in her lair at the end of the Jump City Arc, [[spoiler: Slade]] spirits her to safety, activating the base's self-destruct to cover their escape. Lampshaded by Beast Boy:
-->"And there's the post big fight self destruct."
* ''Fanfic/LifeInManehattan'': The FinalBattle between the Manehattan Six and Nightmare Moon occurs in a PocketDimension facsimile of Manehattan created by the latter; when she's defeated, it starts to fall apart. Fortunately, Luna is able to carry them all to safety.
* ''FanFic/ThroughADiamondSky'': Clu [[LampshadeHanging hangs a lampshade]] on this when killing The Baron causes his hideout to go to cascade failure. But {{justified|Trope}} because of the base's shoddy construction and The Baron soaking up ''way'' too much power, destabilizing it further.
-->''"Explain to me," Clu grumbled. "Why we take out the boss and this place decides to go into cascade failure?"''
* ''FanFic/QueenOfAllOni'': After the Oni Elders suffer their FinalDeath, the abandoned ancient Shadowkhan city in the Shadow Realm -- which had long been sustained by their power alone -- collapses into dust.

[[folder:Films -- Animation]]
* At the end of ''WesternAnimation/ThePebbleAndThePenguin'', [[Creator/TimCurry Drake]] hurls a boulder at Hubie as a last-minute attempt to kill him, but he throws said boulder in the wrong direction, and as a result the boulder rolls back and crushes Drake to death before finally destroying enough pillars holding up his island causing it to crumble into the sea.
* In the Creator/{{Aardman|Animations}} short film ''Stage Fright'', after the villain kicks the bucket ([[VisualPun literally]] and figuratively), the theatre starts collapsing.
* In ''WesternAnimation/TheLastUnicorn'', after the defeat of the Red Bull, King Haggard's Castle crumbles, throwing him into the sea.

[[folder:Films -- Live-Action]]
* ''Film/{{Krull}}'', though this is also a case of NoOntologicalInertia. Also, the pieces fall up - apparently the villain was so evil, the planet won't have any of it.
* When Dr. Merrick is killed in ''Film/TheIsland'' (2005), the holographic projectors are destroyed. This allows the inhabitants of the underground facility/prison to escape into the real world. Though this is actually due to Lincoln's actions before he killed Merrick.
* For some reason, throwing Sabbala in the volcano causes it to erupt in ''Film/ThePeopleThatTimeForgot''.
* ''Film/IfLooksCouldKill''; Zigesfeld being crushed under a falling cage while standing on a gold vat causes Steranko's mansion to begin blowing up from the inside out from the resulting explosion. [[MadeOfExplodium Who knew liquid gold was so volatile?]]
* This happens at the end of ''Film/LogansRun''.
* ''Film/YorTheHunterFromTheFuture'', an old B-movie starring Reb Brown, has a cave inexplicably collapse after the strongest warrior of the tribe living there is defeated.
* In ''Film/{{Spawn}}'', Jason Winn sets himself up as the ''ultimate'' load-bearing boss: He attaches a heart-rate sensor to himself, which will set off dozens of virus-bombs all over the world in the event of his death to deter assassinations (though how a would-be kill is supposed to know this ahead of time is anyone's guess). [[spoiler: Spawn uses [[AWizardDidIt his nifty magic powers]] to just pull the sensor out of his body before turning him over to the cops.]]
* ''Film/TheLordOfTheRings: Return of the King'' makes it even more extreme than the book: The death of [[spoiler: Sauron]] causes the land around the entrance to the black gate to collapse into a pit, taking the orc army with it, while the area on which the good guys are standing forms a sort of rock outcropping.
* Averted in the Film/JamesBond film ''Film/TheManWithTheGoldenGun''. Scaramanga's base/lair/thing begins to explode as soon as Bond kills Scaramanga, but this is due to the unrelated actions of a less-than-intelligent Bond Girl.
* Justified in ''Film/{{Inception}}'': killing the dreamer makes their dream world spectacularly collapse.
* Happens in ''Film/BigTroubleInLittleChina'' when the evil wizard Lo Pan is killed [[spoiler: by a knife to the forehead]] by hero Jack Burton.
* In ''Film/KillerKlownsFromOuterSpace'', when the giant monster klown dies, the klowns' spaceship immediately explodes.
* In ''Film/ConanTheDestroyer'', when the wizard guarding the key is killed his entire crystal palace crumbles into the lake.
* After detective Nicholas finally kills Bernard Phillips in ''Film/GodToldMeTo'', the building they were in catches fire and starts collapsing, possibly because of all the energy deployed in the fight.
* In ''Film/{{Dredd}}'', Ma-Ma has an emitter that will send a signal when her heart stops beating, activating a detonator connected to enough explosives to destroy half the block she is in. [[spoiler:Dredd just shoots her to keep her unable to defend herself, pumps her full of a drug to make her time perception go slower and throws her off a window. The signal does not reach the detonator.]]

* In ''Literature/NightDragon'', the title dragon's mountain lair collapses after the hero kills it (twice).
* In ''Literature/HouseOfHell'' (also by ''Literature/FightingFantasy''), when you defeat the FinalBoss, the eponymous House catches fire, and you get the satisfaction of seeing it [[KarmicDeath burn to the ground.]]
* ''Literature/LoneWolf'':
** Start with Book 7, ''Castle Death'', and the destruction -- in a volcanic eruption -- of the title fortress of Kazan-Oud after the defeat of its evil Lord, Zahda. Though to be specific, it is the shattering of the [[ArtifactOfDoom Doomstone]] which induces this, since its magic was keeping the volcano at bay, and not just Zahda's death.
** Averted in Book 12. If Helgedad is destroyed shortly after the defeat of BigBad Gnaag, it's because Lone Wolf has brought a ''freaking magical bomb'' with him, causing a chain reaction that wipe out the whole evil capital city.
** Played straight in Book 17, ''The Deathlord of Ixia'', with the destruction of BigBad Ixiataaga resulting in the collapse of the whole city of Xaagon as [[NoOntologicalInertia time is catching up with it]].

* Probably the earliest example (from 1470), Sir Thomas Malory's ''Literature/LeMorteDarthur'' features a fight between Balin and King Pellam. Balin's sword breaks, so he steals an ornate spear that happens to be lying around.
-->''And when Balin saw that spear, he gat it in his hand and turned him to King Pellam, and smote him passingly sore with that spear, that King Pellam fell down in a swoon, and therewith the castle roof and walls brake and fell to the earth, and Balin fell down so that he might not stir foot nor hand. And so the most part of the castle, that was fallen down through that dolorous stroke, lay upon Pellam and Balin three days.''
* Another early example is Creator/EdgarAllanPoe's classic Gothic tale "Literature/TheFallOfTheHouseOfUsher", first published in 1839, in which the eponymous house breaks in two and collapses when Roderick and Madeline die. Their deaths don't actually cause the house to collapse. However, since the house was a metaphor for the family, it seems justified.
* ''Literature/{{Dracula}}'' was apparently originally going to include a scene where Dracula's castle collapsed upon his defeat (though it would not have been a threat to anyone, since the climactic battle takes place ''outside'' of the castle).
* Neal Stephenson's ''Literature/SnowCrash'' has a rare example of one without a CollapsingLair. Raven, a big mutant Aleut has a hydrogen bomb he carries around with on a motorcycle sidecar. It's hooked up to an implant that sends the detonation signal if his heart stops. (This, combined with his incredible fighting skills and use of undetectable glass knives, leads the main character to label him "The Baddest Motherfucker in the world".)
* Literary {{subver|tedTrope}}sion: in ''Captain's Fury'', fourth book of the ''Literature/CodexAlera'' series, one of the villains has managed to tie the ongoing calmness of a volcano in his homeland to his own survival via magic. [[spoiler:Rather than waiting for the volcano to go boom upon the villain's eventual defeat, his rival Gaius Sextus actually uses this to defeat the villain in the first place by blowing the volcano up on top of the still-living villain, burying him and his entire capital city in volcanic ash a la Pompeii.]]
** The villain had been inspired to do this by Lady Placida's more benevolent use of it in the previous book; she had used her powers to suppress destructive furies in her homeland that would be unleashed upon her death unless the proper steps were taken, forcing her husband into neutrality after the villain kidnapped her. She'd had no intention of using it as a weapon, and was merely trying to help her people.
* In ''Literature/TheSilverChair'' by Creator/CSLewis (one of Literature/TheChroniclesOfNarnia), the death of the Lady of the Green Kirtle causes not just her fortress, but her entire underground kingdom to be destroyed. The protagonists speculate that she had used sorcery to ensure this would happen as a means of [[TakingYouWithMe posthumously avenging herself on her killer]].
* In another classic children's fantasy series, ''Literature/TheChroniclesOfPrydain'' by Lloyd Alexander, we see this trope played out in the fiery collapse of the castle of Arawn, Lord of the Dead, in the land of Annuvin, when he is killed by the sword Dyrnwyn.
* The destruction of the One Ring in ''Literature/TheLordOfTheRings'' causes both the death of Sauron and his Dark Tower to collapse. It's explicitly noted earlier that the Ring's power was holding the thing up. It also causes the collapse of the Black Gate and the Teeth of Mordor (the guard towers by the gate).
** Further confirmed by the fact that after the first killing of Sauron (which wasn't accompanied by the destruction of the Ring) the allies had had to demolish his fortress manually rather than magically.
* ''Literature/ASongOfIceAndFire'' had this setup at one point. [[spoiler:It was the reason Jaime killed Aerys: he found out about Aerys's plan to use [[GreekFire wildfire]] to burn everything in King's Landing, including his family and all the innocent people, and decided that it could not be allowed to happen.]]
* King Haggard and Haggard's castle in ''Literature/TheLastUnicorn'', both in the novel by Creator/PeterSBeagle and the animated movie.
* As noted above, in ''Discworld/TheColourOfMagic'' when Bel-Shamharoth, an EldritchAbomination, retreats from his temple, this causes the released inertia from formerly-stopped time to erode it away to nothing in seconds, being a JustifiedTrope version of NoOntologicalInertia.
** Justified in ''Discworld/{{Sourcery}}'', where Coin created the huge miles-high tower (which has become the new home for wizards), by using raw magic. Once he starts dueling with [[spoiler:his father]] and they start pulling magic from the tower, well...
** Used again in ''Discworld/{{Hogfather}}'' with the Ice Castle.
* In Barry Hughart's "novel of an ancient China that never was," ''Literature/BridgeOfBirds'', the Duke of Chin's castle crumbles into dust after the Duke does.
* In ''Literature/ChroniclesOfTheEmergedWorld'' this is what happened when[[spoiler: the Tyrant is vanquished]].
* In the Literature/SolomonKane story ''The Moon of Skulls'', the hidden city of Negari is destroyed by an earthquake just after its queen Nekari is killed.
* The BigBad of ''Literature/AgainstADarkBackground'' claims to have a DeadManSwitch to take a good chunk of civilization with him.
* In ''[[Literature/TheAdversaryCycle Nightworld]]'' this is explained as being due to the BigBad using magic to counteract the laws of physics. When he dies, nature reasserts itself and the underground cavern starts to collapse due to the weight of the ground above.
* In Literature/{{Apotheosis}}, there is a peculiar example in which the boss is on the same side as the protagonists. The AI calling itself Tjaele Mosasa has been manipulating society for centuries to keep Bakunin a Stateless planet, and thus one that will tolerate Mosasa's existence. As soon as he's gone, the Proudhon Spaceport Development Corporation starts taking over, and the old society of Bakunin collapses.
* In the ''Literature/RainbowMagic'' series, in the final Sugar and Spice Fairy book, the return of all seven charms makes Jack Frost's Candy Castle collapse and melt away.
* Subverted in ''Literature/TheHeroesOfOlympus'': At the end of ''[[Literature/PercyJacksonAndTheOlympians Percy Jackson and the Last Olympian]]'', Mount Othrys collapses and the cast presumes it's due to Kronos' defeat... actually, [[spoiler: While Percy and co were defending Olympus, the children of the Roman gods were assaulting Mount Othrys.]]
* Emperor Palpatine was this in ''Literature/StarWars''. Aftermath: Empire's End reveals that he ordered Gallius Rax to implement a contingency plan in the event of his death, during which Rax would take control of the Empire and lure it and the Empire's enemies to the planet of Jakku, where he would detonate the core and wipe out both, leaving the galaxy to rot. Rax was then to establish a new Empire in the Unknown Regions. [[spoiler: Rax is killed before he can accomplish this, but he does pass on the second part of the plan to Admiral Rae Sloane, who uses it to establish the First Order in the Unknown Regions.]]

[[folder:Live-Action Television]]
* ''Series/DoctorWho''
** [[spoiler:The Tenth Doctor]]. Elaboration: [[http://www.youtube.com/watch?v=sVEY5AL5zzk#t=20s (CAUTION: Here be spoilers.)]]
** In [[Recap/DoctorWhoS27E1Rose "Rose"]], the Nestene Consciousness. When the anti-plastic hits, the facility goes ka-boom.
** In [[Recap/DoctorWhoS10E1TheThreeDoctors "The Three Doctors"]], Omega's will is the only thing keeping the antimatter world together.
* {{Justified|Trope}} in the ''Series/StarTrekDeepSpaceNine'' episode "Extreme Measures," [[spoiler: when Sloan dies, and it is feared that the resulting collapse of his mind-scape (which Bashir and O'Brien were exploring) would have been fatal to anyone still inside.]]
* ''Series/CriminalMinds:'' "Fisher King" (Part 2) The unsub blows himself up, forcing the team to first locate the hostage inside and escape while the house is burning.
* ''Series/MacGyver1985'': Erich von Leer in "Legend of the Holy Rose, Part 2". When von Leer is killed, he stumbles backwards into the entrance of the Temple of the Holy Rose, which proceeds to collapse on top of him, burying the temple. (Properly the collapse is the result of a secondary explosion caused by the FrickinLaserBeams that kill von Leer, and Mac speculates that the original designer of the temple intended for his work to be buried.)

* ''Toys/{{Bionicle}}'' put a unique twist on this by having the BigBad ''be'' the Matoran Universe itself for the GrandFinale. This meant that if the villain died, the universe would fall apart and become uninhabitable. But there was another twist, namely that this process took about three days to happen. Everyone escaped within seconds, thanks to [[SciFiWritersHaveNoSenseOfScale the writer taking artistic license with scale]].

[[folder:Tabletop Games]]
* In ''TabletopGame/{{Exalted}}'', the [[OurDemonsAreDifferent Primodials]] have multiple souls organized into different PowerLevels. The most important one is called the Fetich Soul, and killing it causes the Primordial to implode and [[CameBackWrong come back wrong]], with a new theme and powers.
* In ''TabletopGame/GeniusTheTransgression'', when a [[MadScientist Genius]] dies, all of his [[AppliedPhlebotinum Wonders]] become Orphans and either [[InstantAIJustAddWater develop rudimentary intelligence]] and go on a rampage or simply break spectacularly. Since more powerful Geniuses often have dozens or even hundreds of Wonders, the results of such a Genius getting killed will be... messy.
* ''TabletopGame/DungeonsAndDragons''.
** In the Judges Guild adventure ''Dark Tower'', the title building collapses after the [[FinalBoss lich Pnessutt]] is killed.
** In the 3.5 Edition supplement ''Elder Evils'', the Hulks of Zoretha cause the entire mountain in which their temple is located to collapse when they are defeated.
** In the 1st Edition module S1 ''TabletopGame/TombOfHorrors'', this happens when you kill the demilich Acererak. [[spoiler: Except not really. You actually killed a fake and he has an illusion set up to make you think the dungeon is collapsing as a result and you get a fake map to another dungeon. If you go back after the collapse, you'll discover the ruse.]] The guy is kind of a prick.
** Module Q1 ''Queen of the Demonweb Pits''. If the {{PC}}s manage to kill Lolth (the title demon queen of spiders) on her home plane in the ChaoticEvil Abyss, the spider ship that they're in starts to distort and disintegrate as it returns to the Chaos from which it was made. The {{PC}}s are [[DeusExMachina rewarded by their patron deities by taken to safety on the Prime Material Plane]].
** ''Magazine/{{Dungeon}}'' magazine #31, adventure "Bane of the Shadowborn". After the {{PC}}s destroy the sword form of the spirit Ebonbane, its domain (Shadowborn Manor) breaks apart and disintegrates, leaving the {{PC}}s floating in the Ethereal Plane.
* Inverted in ''TabletopGame/BeastThePrimordial'': a Beast's power stems from his or her connection to an EldritchLocation, her Lair. As a result, if you can somehow destroy the Lair first, you will severely hurt or even kill the Beasts connected to it.

[[folder:Video Games]]
* At the end of ''VideoGame/BaldursGate II: The Throne of Bhaal'' the plane you're fighting on collapses shortly after the battle as the power that was sustaining it and that the FinalBoss was channeling departs after their defeat. Unusually, you're at no risk having already left, but the boss, who wasn't quite dead, is crushed by it.
* Justified in ''VideoGame/CallOfCthulhuDarkCornersOfTheEarth'', where defeating Hydra will make the psychic barrier she has raised around Y'ha'neth'lei vanish, allowing the navy submarine to torpedo the place, unaware that there's someone inside aiding their efforts.
* Dracula, in the ''Franchise/{{Castlevania}}'' series, is a classic, and possibly the most famous example. When defeated, Castlevania, his lair, will almost always crumble, usually ending with the hero(es)/heroine(s) standing on a nearby cliff watching the castle fall. Possibly justified, as the two are mystically connected -- doing it in reverse (sealing off the castle and ''then'' killing Dracula) is how Dracula was KilledOffForReal.
* In ''VideoGame/CaveStory'', beating the FinalBoss will cause this, but beating the TrueFinalBoss will ''stop'' it. The reason for this gets explained in-game: [[spoiler:Ballos]] (the True Final Boss), whose powers are beyond his own ability to control, is actively tearing down the island. The Core (the Final Boss) is meant to seal him off and keep that from happening, so breaking the Core starts the fall. Killing the True Final Boss makes him stop tearing the island down, so it stops falling.
* In ''VideoGame/ChronoTrigger'', defeat of Magus and Lavos Core creates a time warp which consumes the surrounding environment. Also, defeat of Queen Zeal destroys The Black Omen. Thanks to time travel, you can actually do this several times.
** {{Justified|Trope}} in the cases of Magus and Queen Zeal. Magus is attempting to summon Lavos to his castle to kill it himself, but the heroes interrupted him and Lavos basically yawned at them. When Queen Zeal is defeated, she calls upon Lavos, who disintegrates the Black Omen as he pulls you into his pocket dimension.
** In ''VideoGame/ChronoCross'', defeating [[spoiler:Miguel]] causes the [[spoiler:time distortion in the Dead Sea]] to explode spectacularly.
* In ''VideoGame/CityOfHeroes'', this is revisited in the "Hess Trial", which references a lot of classic tropes. The final mission of a series takes place [[VolcanoLair inside an active volcano]], [[NoOSHACompliance on dinky walkways]] suspended above a [[LavaPit sea of lava]], in which a HumongousMecha stands ready for launch. The final boss, a cybernetically-enhanced army officer (and the only one capable of piloting the Megamech) causes the base to inexplicably self-destruct upon his defeat, prompting the involved heroes to flee with mere seconds to spare. This is actually also very dangerous for groups that haven't done the mission yet, due to the way the game engine displays those type of messages. They jump onto the screen then fade out one at a time, and finishing the mission triggers a series of them: "Mission Completed!" "Badge Earned!" "Level Up!" [[BreadEggsMilkSquick "1:00 to escape!"]] "Enhancement Found!" Leading to memorable "Wait, what was that last one?" moments before a mad dash to the exit.
* The FinalBoss in ''VideoGame/CobraMission'' activates a series of bombs as he dies. His EvilLaugh echoes through the cut-scene as the heroes escape.
* In ''VideoGame/{{Darksiders}}'' [[TheDragon Straga]] is a load bearing boss. His death causes the Destroyer's Tower to fall. Except for its top. This was even lampshaded by [[spoiler: Azrael]]. The top of the tower still floating is stated to have only been due to its close proximity to the Destroyer himself.
* All of the end-of-level bosses in ''VideoGame/{{Descent}} 1'' and 2 - usually hostile reactors attempting to defend themselves by shooting energy balls, but sometimes there's a more traditional KingMook. Upon defeat, the countdown timer starts, a female ComputerVoice announces the activation of the self destruction sequence, sirens start blaring, and the level is constantly rocked by tremors while the lighting blinks. The player must escape via the designated emergency exit within the designated time. If the player is successful in reaching the exit, a {{Cutscene}} shows your ship [[OutrunTheFireball Outrunning The Fireball]] [[AlwaysClose no matter how much time there is left on the timer]]. If the player fails to make it in time, the screen will FadeToWhite.
* Master Archfiend Zoma in ''VideoGame/DragonQuestIII'', and Necrosaro in ''VideoGame/DragonQuestIV''. Zoma's case is a little odd, since [[spoiler:later, in ''VideoGame/DragonQuestI'', Castle Charlock is still standing. Even if a new castle was constructed on the site, how would Dragon Lord have known the original layout given that he was a hatchling when it originally fell]]?
* In ''VideoGame/DragonQuestVIII'', the Black Citadel starts collapsing after you defeat [[spoiler: Rhapthorne]]. Interestingly, this is both foreshadowed and justified by a stone tablet found earlier in the dungeon, stating that the citadel cannot exist without it's master, and will "turn it's very substance against the pilgrims from the world of light" should he be defeated. In other words...NoOntologicalInertia.
* ''Franchise/TheElderScrolls''
** In ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'', BigBad PhysicalGod Dagoth Ur plays with it. He ''is'' a god, and you cannot actually kill him, because he'll just immediately resurrect again. However, when you sever his ties to the [[CosmicKeystone Heart of Lorkhan]], he will die and, due to the bindings on the Heart being removed, the room you are in will collapse into the lava below. Crosses over with EmpathicEnvironment, as his death will also cause the raging blight storm around Red Mountain to cease for the first time in centuries.
** Played straight in ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]''; when you kill BigBad Mankar Camoran, his other-dimensional "Paradise" dies with him. But then, he did create it after all.
* ''VideoGame/{{Fallout}}''
** The Master from ''VideoGame/{{Fallout 1}}'' triggers a bomb on a countdown timer that will destroy his base. You could also trigger the bomb yourself and run away cackling like a little sadistic schoolgirl as an alternative to dealing with the Master.
** If [[spoiler: President Eden is convinced to shut himself down]] in ''VideoGame/{{Fallout 3}}'', he will trigger Raven Rock's self-destruct.
** In ''VideoGame/FalloutNewVegas: Dead Money'', defeating Elijah causes the Vault to be rocked by explosions, as well as starting a timer on your bomb collar, possibly justified if [[spoiler:you did so by trapping him in the Vault; he still has his Pipboy, so he's ''probably'' trying to trigger everything that might kill you]]. In the ''Old World Blues'' add-on, if Gabe is killed during the Residential Cyberdog Guard Test, you have ten seconds to leave the testing area before his atomic core detonates and incinerates everything in a 10-meter radius.
* Often occurs around the middle of the game in the ''Franchise/FinalFantasy'' series:
** In ''VideoGame/FinalFantasyVI'', defeating Kefka in his [[OneWingedAngel final form]] results in the collapse of his tower as the [[CutScene protagonists escape]]. Although, [[JustifiedTrope to be fair]], the tower was made of magically combined junk and trash isn't known for its ability to hold together in a safe form all by itself. And killing Kefka causes all magic to cease to exist, thus removing the force binding the tower together. Tragically, [[spoiler:Shadow [[TheAtoner chooses to stay behind]] and (presumably) dies in the collapse, vowing to start all over again]].
** ''VideoGame/FinalFantasyIX'' has an unusual twist on this trope; the Evil Forest that your airship crashes into after the introduction turns to stone after defeating its core. In a subversion, one of the Tantalus bandits doesn't make it out in time. That was Blank. [[spoiler: He got better.]]
** Played straight with Barbariccia and the Tower of Zot in ''VideoGame/FinalFantasyIV''. Apparently, the tower was being held up in the sky by the Fiend of Wind's power, though [[FridgeLogic it's not explained]] where the tower (or its remains) ''landed''.
*** And again with the Giant of Bab-Il and the CPU.
** Perfectly justified in ''VideoGame/FinalFantasyX'': [[spoiler:Yu Yevon is the summoner whose constant dream]] causes Sin to even exist; therefore, defeating him [[spoiler:ends the dream and makes Sin dissolve into pyreflies]].
** In ''VideoGame/FinalFantasyXII'', [[spoiler:the Undying rips chunks of ''Sky Fortress Bahamut'' to create his own body]], and [[SlidingScaleOfGameplayAndStoryIntegration smashes the hell out of the fortress while trying to annihilate the party]]. The accumulated damage and stress cause the glossair rings to stop working --thus sending the whole thing crashing down towards Rabanastre-- shortly after the FinalBoss's defeat.
** ''VideoGame/FinalFantasyXIII'' gives us another justified example. [[spoiler: Orphan, the fal'cie fought at the end of the game who is of a BigBadDuumvirate with Barthandelus, is actually the power source of all Cocoon. When the protagonists kill it, the power system of Cocoon fails and it begins sinking towards Pulse.]]
** ''VideoGame/FinalFantasyTactics'' has this with its final boss battle. [[spoiler: WordOfGod says that at the very least, Ramza and Alma survived, but the ending was ambiguous enough that it could easily have gone either way.]]
* A variation: after the final battle in ''VideoGame/GrandTheftAutoSanAndreas'' (which is against a former ally who betrayed you, rather than against the BigBad), the BigBad shows up and then runs away again, stopping only to set some explosives that will destroy the building, giving you just enough time to escape. The mechanics of the mission fit this trope (you fight the Boss, then have to escape before the building is destroyed), but the explanation is different (in that there actually ''is'' an explanation).
* In ''VideoGame/GreatGreed'', upon the defeat of Bio-Haz, his castle collapses and the heroes escape in a balloon. Shortly afterwards recurring boss Sarg is defeated, and his hideout collapses as well.
* ''VideoGame/HalfLife''
** The FinalBoss of [[VideoGame/HalfLife1 the first game]], the Nihilanth, is a spectacular example. Not only does its death cause the collapse of the chamber in which the player fights it, again [[spoiler:escape only possible due to the [=GMan=]]], but it ''rips open an entire dimension'', causing the Earth to be subsequently ravaged by portal storms and allowing the Combine to transport enough of their military to conquer the planet in ''seven hours''. [[NiceJobBreakingItHero Excellent work there, Gordon]].
** ''VideoGame/HalfLife2''. After you disable Dr. Breen's teleporter, it explodes in a reality ripping manner. However, it does this almost immediately afterward, leaving no time for escape. [[spoiler:The only reason you survive is because of the [=GMan=]'s timely intervention.]]
* In ''VideoGame/{{Heretic}}'', the Dome of D'Sparil magically shatters after the player defeats D'Sparil, and upon escaping the player is told he's escaped "mere moments" before its destruction. Though that's purely fluff. You can wait a couple dozen hours looking at the villain's corpse before stepping in the exit teleporter, and nothing will happen in the game. An actual in-game effect is that all remaining monsters on the level are instantly killed. But this doesn't reach too far because then you've got two more episodes (in the extended edition) fighting more of his monsters, eager to avenge their fallen master.
* ''Franchise/TheLegendOfZelda''
** In ''VideoGame/TheLegendOfZeldaOcarinaOfTime'', Ganondorf destroys the castle "with his last breath", perhaps out of spite, triggering a timed escape from the fortress. This also provides the location for the final battle against Ganon, on the ruins of the former castle.
** Defeating Vaati also causes Hyrule Castle to start collapsing in ''VideoGame/TheLegendOfZeldaTheMinishCap''.
* Happens at the end of ''[[VideoGame/MeatBoy Super Meat Boy]]''. Dr. Fetus pulls a TakingYouWithMe and activates the self-destruct system for his castle after plummeting to his doom, forcing the player to flee back to the start of the level in order to escape.
* ''Franchise/MegaMan''
** All of the ''VideoGame/MegaManClassic'' games, though usually without the "escape the fortress" level.
** A boss from the first ''VideoGame/MegaManZero'' game plays it straight. Thing is, fighting the Boss is the halfway point, and escaping from the CollapsingLair is the second half of the level.
** ''VideoGame/MegaManX3'' subverts this if you fight Vile in his factory stage. At the start of the fight, he says the factory is already set to destruct. Once you win, you always have about a minute to escape before the factory blows up.
** ''Videogame/MegaManBattleNetwork 1'', 3, 5 and 6 all end with the villain's real-world lair exploding after defeating the last boss.
** The first and final games of the ''VideoGame/MegaManZero'' series play this straight. In the former, [[spoiler:the badly-damaged Copy-X decides to pull a TakingYouWithMe and self-destructs in a final effort to kill Zero, which fails]]. In the latter, [[spoiler:the already badly-damaged Ragnarok station completely tears apart through a combination of [[ColonyDrop falling towards the earth at high speeds]] and the fact that [[BigBad Dr. Weil]] [[FusionDance merged with the station itself]] to power up in a final effort to kill Zero and destroy the Resistance. [[HeroicSacrifice Zero doesn't make it out this time]]]].
** Played straight with the final bosses of both ''Videogame/MegaManZX'' titles. [[spoiler:The first game is due to Serpent's OneWingedAngel mode being fused with Slither Inc's power supply, and with his death the entire thing tears apart. In the second, Master Albert's life was tied to that of [[WombLevel Ouroboros]], so his death results in the ArtifactOfDoom exploding in the sky and the wreckage sinking into the ocean]].
* Not a typical video game "boss" per se, but in the final normal level of ''VideoGame/MediEvil2'', Daniel must invade a giant cathedral possessed and haunted by demons, save 12 angels and use them to kill the head demon of the cathedral...doing so causes Dan to get no more than a minute to escape the cathedral, which is now absolutely annihilating itself, smashing to bits, and causing an explosion big enough to level that part of London.
** At the end of the first game, Zarok uses the last of his power to destroy his castle lair, along with his entire domain, in an attempt to take Daniel with him.
* Lampshaded in ''VideoGame/DoubleDragon Neon'' when the space station explodes and crashes after you beat Mecha Biker. "I didn't know it was a load-bearing robot!"
* ''Franchise/{{Metroid}}'' is sometimes kind enough to have an explanation for the timer, initially using it for final bosses but lately just as often with the WarmupBoss instead.
** In ''VideoGame/MetroidFusion'', there are two subversions, both in that the boss has to be defeated ''before'' the timer runs out.
*** First, the engines overheat due to the X-Parasites shutting down the cooling unit. You have five minutes to journey from Sector 5 to deep into Sector 3 to shut them down, ''and'' defeat a Beam Core-X inside.
*** Second, at the end of the game. You [[spoiler: alter the orbit of the B.S.L Station, where it crashes into S.R.388, to vaporize both, and so destroy the X-Parasites inhabiting both.]] As you escape, you fight [[spoiler:Omega Metroid]], likely with about half your time gone.
** The GBA remake of the first game, ''VideoGame/MetroidZeroMission'', contains two. One is the classic Mother Brain, and the other is Mecha-Ridley, who sets the version-exclusive Space Pirate Mothership to self-destruct after being defeated.
** In ''VideoGame/MetroidPrime2Echoes'', there's ''two'' final bosses, one that's load bearing and one that you fight during the escape. Although if you want to be technical, it's actually ''Samus's'' actions after the boss is already dead that set off the planetary collapse.
** In ''VideoGame/MetroidPrime'', after you kill the Parasite Queen, she falls into the Frigate Orpheon's reactor core, causing it to [[GoingCritical go critical]] and forcing Samus to evacuate the ship.
*** And when you kill the eponymous Metroid Prime, the Impact Crater crumbles in on itself, the effects reaching to the Artifact Temple. Unlike the earlier example, however, you don't see her escaping anything but the explosions above ground, never mind controlling Samus.
** Mother Brain, as pictured by Cracked in the page image. Twice.
** ''VideoGame/MetroidPrimeHunters'' includes an escape timer after every boss except the final. If you don't make it out on time, a wave of energy takes up the screen and you die. Unlike explosions revisited in other games, it does no damage to the surrounding area. Just made to break your suit, apparently.
** ''VideoGame/MetroidIIReturnOfSamus'' for the Game Boy avoided this trope; when you killed the Queen Metroid you simply had to make your way to the surface at your own pace and reenter your ship. Don't worry though, [[MikeNelsonDestroyerOfWorlds Samus]] [[spoiler:gets to blow up the planet later]].
** ''VideoGame/SuperMetroid'' makes up for it by slapping you with a timed explosion ''right at the start of the game,'' immediately after [[HopelessBossFight futilely]] facing the WarmupBoss Ridley, who killed the ship's crew ''and'' stole the baby Metroid.
** Strangely enough, in ''VideoGame/MetroidPrime3Corruption'', Samus herself gets a load bearing Hypermode [[spoiler:when she lands on Phaaze. She has to not only FIND and KILL Dark Samus, but also Aurora Unit 313 before time runs out and she becomes wholly corrupted.]] It turns out [[spoiler:AU 313 was connected to the planet's core.]]
** ''VideoGame/MetroidOtherM'' doesn't have a straight example, but due to a coincidence, [[spoiler: Phantoon]] is one in terms of gameplay.
* ''Franchise/KingdomHearts''
** ''WesternAnimation/TheNightmareBeforeChristmas'''s Oogie Boogie's defeat leads to his manor being destroyed. To be fair, Oogie had somehow merged ''with'' his manor.
** The Cave of Wonders also collapses after Jafar is defeated the second time, but when the player returns, the cave is back to normal.
* The NES ''VideoGame/NinjaGaiden'' games always finished with a shot of Ryu watching the BigBad's fortress crumble into ruins while standing atop a distant hilltop. In the Xbox remake, defeating [[PsychoElectro General Dynamo]] causes the airship to go down in flames Hindenburg-style.
* In ''VideoGame/NoOneLivesForever'', one of the encounters towards the end of the game, while not much of a boss fight, has a strong element of this. The vanquished foe has previously ingested a liquid, timed explosive, forcing Cate Archer to conduct a swift evacuation of the area in which the battle takes place.
* After defeating the titular villain, Nemesis, in ''Odyssey: The Legend of Nemesis'', his lair begins to self-destruct, catching on fire, and crumbling into rubble. A fitting and perhaps honorable coincidence is that while you are escaping his lair's self-destruction,[[spoiler: "The Sunken Cathedral"by Claude [=DeBussy=] plays in the background (though it was played before confronting Nemesis), given that his lair is on an island.]]
* Likewise, in ''VideoGame/ResidentEvil4'', during your final battle with Krauser, he activates his time bombs, which only gives you ''three'' minutes to beat him and escape.
** The final battle ends in you escaping on a jet ski while the entire island explodes as a result of [[spoiler:Ada Wong]] activating the self-destruct mechanism. {{Lampshade|Hanging}}d when Leon matter-of-factly tells his charge that they have to get off the island before it explodes (he's been there before]]), and she answers "It's going to '''''what'''''?"
** Every single ''Franchise/ResidentEvil'' game fits this trope. Whether the deadline starts before the boss fight or afterward, you can be sure the mansion/base/castle/ship/island will explode in the following cutscene.
** ''VideoGame/ResidentEvil3Nemesis'' and both ''VideoGame/ResidentEvilOutbreak'' games take this trope to the logical extreme. The city is NUKED after the final boss fight.
*** "Dorothy" from ''VideoGame/ResidentEvilOutbreak: File #2''.
* In ''VideoGame/{{Ristar}}'', the bad guy's fortress starts to explode as soon as the final blow is struck. [[spoiler:However, the BigBad seems to escape.]]
* As Andross is defeated in the ''VideoGame/StarFox'' series, the area in which the fight takes place explodes, forcing the player to escape. In ''VideoGame/StarFox64'', this is complete with Andross yelling, "If I'm going down I'm TakingYouWithMe!" At this point, [[spoiler:James [=McCloud=]]] shows up and you have to follow him through a maze to get out again -- make a wrong turn and you'll get caught in the explosion.
* Defeating Myria in ''VideoGame/BreathOfFireIII'' causes her space station to collapse. Occurs several times in ''VideoGame/BreathOfFireI'', and is played for tragedy once when [[spoiler:Cerl combines HighHeelFaceTurn with YouShallNotPass, buying time for Ryu and the others to escape her fortress by fighting her former allies. Its disappearance confirms her death, ''and'' takes out another sympathetic character in the process.]]
* [[Franchise/SuperMarioBros Mario]], from BlackComedy-filled ''VideoGame/ImOK''
* Neo X from ''VideoGame/StreetsOfRage 3''.
* ''VideoGame/WarioLand''
** Syrup Castle in ''[[VideoGame/WarioLandSuperMarioLand3 1]]'' and ''[[VideoGame/WarioLandII 2]]'' explodes after Captain Syrup is defeated, the first time being explained by a gigantic bomb being placed in the throne room, the second actually sending the boss flying into the horizon.
** Defeating the Golden Diva in ''VideoGame/WarioLand 4'' causes the golden pyramid to sink into the ground as Wario escapes with the treasure.
** There's also Rollanratl in ''[[VideoGame/WarioLandShakeIt The Shake Dimension]]'', who's a literal example. He's actually holding up the boss arena ceiling, and once defeated the roof pretty much falls and crushes him.
* Defeating Mundus in ''VideoGame/DevilMayCry'' causes the collapse of the entirety of Mallet Island.
* Defeating Dr. Robotnik at the end of most of the ''Franchise/SonicTheHedgehog'' Sega Genesis games.
** Subverted in ''VideoGame/{{Sonic 3|AndKnuckles}}'''s Marble Garden Zone where the ground is destroyed by the boss BEFORE you fight him.
** In ''[[VideoGame/Sonic3AndKnuckles Sonic & Knuckles]]'', Flying Battery Zone has 3 bosses (most other zones have only 2), the second of which is more like an interactive cutscene than a boss. After said boss, the battleship starts to collapse and you have to get out. Justified in that it had fired lasers at a major support.
* In ''VideoGame/{{Ico}}'', the moment the final boss is killed, her entire castle, and the thousand-foot-high outcropping of rock it stands on, immediately crumbles into the sea for no discernable reason during an extended cutscene.
** The novelization suggests that the Castle in the Mist is suspended in time by her magic, making this a case of NoOntologicalInertia.
* ''VideoGame/{{Suikoden}}'':
** Subverted weirdly in ''VideoGame/SuikodenII'': After defeating the final boss, [[spoiler:the Beast Rune Incarnation]], L'Renouille begins to rumble violently. Your hero is semi-literally dragged out of the throne room by one of his generals to keep from rushing into search for his "childhood friend" Jowy. Even Shiro, the feral wolfdog, will help convince the hero that he must flee. Once the non-TimedMission cutscene ends of everyone escaping... nothing happens to the castle and it still stands. However, the rumbling could conceivably have just been from the [[spoiler:Beast Rune]]'s unearthly death roar.
** The final boss of ''VideoGame/SuikodenI'', [[spoiler: Golden Hydra, which was Emperor Barbarosa transformed with the power of the Dragon King Sword]]. After the post-final-battle cutscene, [[spoiler: Emperor Barbarosa]] leaps from the top of the castle and after a blinding flash of light and the sound of an explosion, the castle begins to collapse and the player must escape. Why the castle collapses is not clear; Perhaps the explosion was what destabilized it (even though the explosion was on the outside of the castle, not inside), or perhaps the final boss's life was tied to the castle itself, much like Dracula and his castle in the Castlevania series.
** Happens yet again in ''VideoGame/SuikodenIV'', to Fort El-Eal. When the final boss is defeated, its body begins to erupt in a series of explosions that start to bring the fort down. As the party escapes by boat, the entire fortress blows up in a tremendous explosion that would have wiped them out, were it not for [[spoiler: The Hero's HeroicSacrifice]]
* ''Franchise/FireEmblem'' has an area collapse in ''[[VideoGame/FireEmblemPathOfRadiance Path of Radiance]]'' when [[spoiler:the Black Knight]] is beaten because his soldiers bring it down out of spite.
* In ''VideoGame/QuakeII'', after [[FinalBoss the Makron]] is defeated, the space station where it is staged blows up as soon as [[PlayerCharacter Bitterman]] escapes in one of the escape pods.
* [[spoiler:Romeo Guilderstern]] in ''VideoGame/VagrantStory''. Since [[spoiler:he had stolen the key to Lèa Monde's power, and subsequently became its focus, his defeat ripped the Dark loose from the city's foundation. When Ashley inherited the Bloody Sin, ''he'' became the bearer of the Dark, and the ravage of time and decay that had been kept at bay for centuries suddenly swept into the ancient city.]]
* The last boss of ''VideoGame/NeverwinterNights2'' is holed inside an ancient ruin, which his destruction inevitably causes to collapse. Unusually, the game doesn't leave the player a chance to escape, but just cuts to the credits.
** The expansion lampshades this, providing the above quote.
** Ironically Jerro himself is guilty of this. [[spoiler:He mentions after you defeat him that if he dies his Haven will collapse and everyone within will die.]]
** There's a bit of an inversion in the original ''Neverwinter Nights'' expansion pack ''Shadow of Undrentide''. [[spoiler:The final Big Bad is being protected by the same magical artifact that is holding the floating city of Undrentide in the air. The only way to kill her is to first destroy the artifact, which causes Undrentide to start falling. You fight and kill her on top of the city while it's in freefall.]]
* ''VideoGame/WorldOfWarcraft'' has a bit of an opposite of this in Kologarn, 5th boss in the Ulduar raid instance. When you defeat him (being a giant with only his upper body in sight), he becomes the bridge to the next area.
** Wording from a Titan computer in Northrend implies that the [[EldritchAbomination Old Gods]] are this for the entire planet. The reason the Titans sealed them away instead of killing them was because they were tied too much to Azeroth.
* When [[spoiler:The Sleeper]] is killed at the end of ''VideoGame/{{Gothic}}'', his underground lair collapses around him -- unfortunately, TheHero is still inside. (This does set him up nicely for a WithThisHerring moment in the sequel.)
* In ''VideoGame/LaMulana'', defeating Mother causes the ruins of La-Mulana to collapse, which makes sense, since [[spoiler:the ruins are the body of Mother, and the [[SequentialBoss five-tier]] boss that you took down is her soul]]. Lemeza's escape happens in a cutscene in the original version, but the remake you have to play it out on a timer. ''La-Mulana 2'' [[DeconstructedTrope deconstructs this trope]], with Lemeza on the run from Interpol as a result of the temple's destruction. Sure, he [[spoiler:saved humanity from being destroyed and replaced by Mother]], but who's going to believe that?
* Averted in ''VideoGame/TombRaider'' and ''[[VideoGame/TombRaiderAnniversary Anniversary]]'', where [[spoiler:it's actually destroying the scion (load-bearing artifact?) that makes Atlantis collapse, and the fight with Natla is done while it is collapsing (''Anniversary'' seems to be far less explicit about this for some reason)]]. Played straight in ''VideoGame/TombRaiderII'', where [[spoiler:killing the BigBad and getting the Dagger somehow makes a big portion of the Great Wall explode in the ending]]. Played straight again in ''[[VideoGame/TombRaiderTheLastRevelation The Last Revelation]]'', as [[spoiler:the great pyramid suddenly starts falling apart after Horus/Set is sealed, although in this case it's an important part of the ending]].
* Played in various ways (mostly straight) in ''VideoGame/MetalSlug 3''. In the last level, a particularly large {{Mook|s}} Walker can only be fired upon from underneath; defeating it means you then have to avoid being crushed as its legs give out and its upper portion falls to the ground. One of the minibosses, a humongous, bolt-firing brain, brings down the house with its defeat. The rest of the level is spent escaping from the mothership as it collapses (harmlessly) around you. [[spoiler:Then you fight the brain again, liberated, as it tries to MindRape you [[AndYourLittleDogToo and your tank]].]] In ''VideoGame/MetalSlug 4'', after you defeat [[MadScientist Amadeus]], you must escape his exploding base before you get engulfed in the explosion.
* In ''VideoGame/TalesOfPhantasia'', huge amounts of energy unleashed during the battle with Dhaos in the Present causes the mausoleum where he was sealed to collapse.
* In ''VideoGame/TalesOfSymphonia'' defeating the boss [[OurDragonsAreDifferent Winged Dragon]] causes its flying nest to fall apart and drop into the ocean. The MadScientist responsible for sending you there knew about this, and used it as a trap that uses [[TheChick Colette's]] LifeEnergy to create [[MemeticMutation an Ominous Light that threatened to]] keep everyone on the CollapsingLair.
** On a lesser note, the first two times you take down a [[QuirkyMinibossSquad Desian Grand Cardinal]], Raine activates their Lair's self-destruct system, destroying them.
* In ''VideoGame/TalesOfDestiny'', [[spoiler: Kronos attempts to take the entire world with him after being defeated in the final battle, by collapsing the Aethersphere (a large layer of rock that had formed around the planet's atmosphere) and thus destroying everything on the surface. This catastrophic event was stopped, thanks to the sacrifice of Dymlos and the other living blades, who plunged themselves into the Eye of Atamoni, the Aethersphere's core. The party escapes as the Eye of Atamoni is destroyed, and the Aethersphere is blown to smithereens, apparently with no further damage to the planet.]]
* ''VideoGame/{{Tekken}} 6'': In Scenario Campaign, after defeating Azazel, you have to fight your way through mooks as the temple collapses.
* ''VideoGame/{{Tenchu}}'': Defeating the dark lord at the end of the game causes his evil lair to begin collapsing. This supposedly kills Rikimaru, until we learn in a later game that he escaped through a time portal into a futuristic world of technology. No, really.
* Happens quite a lot in the ''Franchise/SuperMarioBros'' series (Bowser's Galaxy Reactor being a notable example).
** From a gameplay perspective, it also happens toward the end of ''[[VideoGame/MarioAndLuigiSuperstarSaga Mario & Luigi: Superstar Saga]]'', after Cackletta's ghost is defeated. Storywise, another character had rigged Bowser's Castle with a TimeBomb. When you successfully flee on the back of a pterodactyl-like ally, the castle explodes in the sky.
** ''VideoGame/SuperMarioGalaxy'' takes it a step further by having a gravity-bearing boss!
** ''VideoGame/NewSuperMarioBrosWii'' actually inverts this in the end, as [[spoiler:a magically-enlarged (and quite angry) Bowser chases after Mario, ultimately resulting in him literally destroying the load-bearing pillars of his castle, causing it to collapse on him. Embarrassing!]]
** After defeating Belome for the first time in ''VideoGame/SuperMarioRPG'', it is revealed that he was standing on a dead man's switch keeping a nearby floodgate closed. Mario tries to hold the switch down himself, but he isn't heavy enough to do it. A tidal wave soon floods the level and sweeps Mario off to the next area.
** After the FinalBoss in the first ''VideoGame/PaperMario'', the castle begins to explode because the battle was so intense. Bowser's castle explodes ''right then and there in the sky'' while Peach's Castle with Mario and others are saved by the Star Spirits.
** ''VideoGame/PaperMarioTheThousandYearDoor'' has a load bearing ''ally''. You fight the boss in his fortress and nothing happens, but once you see the AlmostDeadGuy ([[spoiler:actually a computer]]) kick the bucket, the place starts falling apart around you.
** In ''VideoGame/MarioAndLuigiDreamTeam'', defeating the final boss causes the final dungeon to collapse around him. Probably justified; [[spoiler: Neo Bowser Castle was created from a wish that Bowser made upon the Dream Stone. Therefore, the castle is most likely tied to the power of the stone itself, and it's destruction upon Dreamy Bowser's defeat caused the castle to perish along with it.]]
* Happens nearly every time to King K. Rool in the ''VideoGame/DonkeyKongCountry'' series, where Gangplank Galleon often sinks after he's defeated, and in the later games, as does the entirety of Crocodile Isle (in a way very much similar to Atlantis). To be fair with Crocodile Isle, he was knocked into the island's ''core''.
* All four of The Corrupted in ''VideoGame/PrinceOfPersia2008'' explode spectacularly when killed. Whether or not this causes the subsequent CollapsingLair escape scene is unclear.
* Happens with the final boss of almost every game in the ''VideoGame/{{Bomberman}}'' franchise, and sometimes the regular bosses as well.
* In ''VideoGame/{{Portal}}'', defeating the FinalBoss causes the mainframe room to tear itself apart, catapulting you to the surface. This was given a TheEndOrIsIt twist in a later update to set up the sequel. In ''VideoGame/{{Portal 2}}'', the FinalBoss is an inversion. You have to defeat him to stop him from blowing up the facility due to negligence, partly because he's too busy trying to kill ''you'' to bother fixing the reactor.
* In ''[[VideoGame/{{Gradius}} Life Force]]'', after you destroy the heart of the LivingPlanet, the planet begins to self-destruct (or explode, hard to tell on 8 bit games). Cue the high speed escape through closing gates that has surely resulted in many a broken controller lodged in many a TV screen. The rest of the ''Gradius'' series does this too, with the escape being a short cutscene... unless you're playing the arcade version of ''Gradius III'', in which case you get a high speed chase through the ''hardest fucking section of the game.''
* ''Film/{{Stargate}}'' for the Genesis/Mega Drive and SNES has Ra's pyramid explode after his defeat [[spoiler:because O'Neil activated the nuclear bomb the team brought with them to explode and teleported out just before detonation.]]
* ''VideoGame/VandalHearts 2''; possibly justified in that the final boss had done extensive damage to the building in transforming to his OneWingedAngel form.
* This happens in ''VideoGame/PhantasyStarIV'' fairly often: killing Zio destroys his fort, killing Lashiec destroys the Air Castle, and killing Dark Force Number 2 destroys the Garuberk Tower (though that last one may be justified, in that the [[WombLevel Garuberk Tower]] is actually part of Dark Force's physical body.)
* Masterfully subverted in ''VideoGame/PhantasyStarIII'', where it's [[spoiler:actually you]] that causes the final dungeon to blow up after beating the boss.
* In ''VideoGame/XMen2CloneWars'' for the Genesis, defeating Master Mold in the Sentinel Factory level causes the whole place to blow up. [[JustifiedTrope Justified]], given that you're explicitly there to destroy the factory and defeating Master Mold overloads the reactor. In an interesting ChekhovsGun moment, you might notice an emergency exit shortly before fighting the boss. This is the only way you can actually leave the place before goes sky-high.
* ''VideoGame/JadeEmpire'' subverts this at least twice.
** ''You'' bring down Mother's lair on top of her (while apparently unkillable conventionally, this must not apply to being crushed to death) by attacking the load-bearing pillars in her chamber.
** Similarly, the Lotus Assassin fortress mostly seems to collapse because of the rogue golems (and to some extent, Death's Hand) damaging the structural supports, rather than your defeat of Mistress Jia.
** You fight the Emperor [[spoiler:and the real BigBad]] in a floating castle powered by magic. You'd think it would fall out of the sky afterwards, right? It doesn't.
* In ''VideoGame/{{Doom}} II'', killing the final boss (on level 30) causes zillions of massive explosions to erupt all over Hell from the boss's death throes. In the words of the game, "Hell is a wreck."
* In ''VideoGame/Persona3'', {{d|idYouJustPunchOutCthulhu}}efeating [[spoiler:Nyx and sealing her away]] causes [[EvilTowerOfOminousness Tartarus]] to [[spoiler:get pulled up into her physical manifestation, the Moon]], returning Gekkoukan High to its form of an ordinary school campus.
* ''VideoGame/Persona4: [[UpdatedRerelease Golden]]'', this trope is invoked and {{lampshade|Hanging}}d at the end of the new bonus dungeon.
-->''(Ominous shaking)''\\
'''Yosuke''': [[OhCrap Don't tell me!]] Is this [[GenreSavvy like in the movies]] where once the bad guy's defeated, his evil fortress self-destructs!?
* Justified in ''VideoGame/Persona5''; Palaces are created from the distorted worldview of the people the Phantom Thieves target. Defeat the target, steal their Treasure (source of corruption), and the whole place comes crashing down. [[IndyEscape Which is a bit of a problem]] [[https://i.ytimg.com/vi/MlKEcJnar-8/maxresdefault.jpg for the protagonists.]]
-->'''Ryuji''': "[[LampshadeHanging For real though, why do Palaces explode so much? Can't they disappear normally?]]"
** [[spoiler: The BigBad Shido exploits this by stopping his heart temporarily, thus beginning the process early. It nearly works, but the Thieves manage to barely escape in time.]]
* ''VideoGame/BionicCommando'': "This base will [[GoodBadTranslation explod]] in 60 seconds. Evacuate right away."
* In ''VideoGame/InTheHunt'', the headquarters of the Evil Organization explode once you defeat the FinalBoss. Depending on whether you used up any continues before you [[SequentialBoss fought its final phase]], you either escape or get [[ItsAWonderfulFailure destroyed along with it]].
* Killorn Keep in ''VideoGame/UltimaUnderworld II'' can be crashed by killing the two brain creatures in a hidden room underneath. The world isn't actually destroyed until you leave it and re-enter. All the keep's residents die, which renders the game {{Unwinnable}} if you do it too soon.
* ''VideoGame/MagiNation'', though somewhat justified as the Big Bad's presence and power are what cause the place to exist in the first place.
* ''Franchise/RatchetAndClank''
** When you defeat [[spoiler:Lord Vorselon for the 3rd time]] in ''VideoGame/RatchetAndClankFutureACrackInTime'' his ship automatically activates "[[LampshadeHanging Sore loser protocol]]" and explodes after three minutes.
** It's also worth noting that this is a rare example of a load-bearing BonusBoss.
** Potentially subverted in [[VideoGame/RatchetAndClank the first game]], where after defeating Drek, [[spoiler:his Deplanetizer is flipped upside down, allowing the heroes to destroy ''his'' planet]]. Doing so causes a rain of flaming rocks, however, requiring Ratchet & Clank to get out of there.
** ''VideoGame/RatchetAndClankUpYourArsenal'' [[spoiler:Nefarious' ''own weapon'']] trigger its self-destruct after defeat.
* In ''[[VideoGame/{{Resistance}} Resistance 3]]'', the final challenge of the game is ''literally'' destroying [[spoiler:the power rods and, in turn, the supports to]] the Chimeran Tower in New York, so... you kind of get what you expect there.
* [[spoiler:Wonder-Jergingha]] in ''VideoGame/TheWonderful101''. Once he's destroyed, the massive fortress begins to break apart... [[spoiler:Once you escape, however, Wonder-Red realizes that what they escaped [[SubvertedTrope wasn't the GEATH-Waksay breaking apart]], nor was Jergingha destroyed; upon his defeat, he decided to ''transform'' into his [[TrueFinalBoss final form]], and they were just escaping before he changed form with the Wonderful Ones still inside]].
* After killing the dragon in the [[ATasteOfPower prologue]] to ''VideoGame/WonderBoyIIITheDragonsTrap'', the screen starts flashing and [[ScreenShake shaking]] and blocks fall from the ceiling, providing a convenient way upwards.
* Defeating the final boss of a particular level of ''VideoGame/MassEffect2'' causes the level (a [[GhostShip derelict starship]]) to crash into a brown dwarf. This is justified in-game since finishing the boss fight requires the player destroy the primary component of the ship's propulsion system, which had been keeping the ship from falling into the brown dwarf in the first place.
** Endgame spoilers: [[spoiler: when you defeat the human-Reaper larva, it knocks the platforms you're standing on down as it falls. While Shepard survives the fall, their squadmates will only survive if they're loyal.]]
*** Subverted in the [[spoiler:Collector Base itself, where Shepard destroys it by sabotaging the reactor, creating an explosion that either destroys the base completely, or just destroys all life-forms in the base.]]
* {{Subverted|Trope}} in ''VideoGame/LiveALive''. When you kill the BigBad and the [[TheVeryDefinitelyFinalDungeon ominous mountain castle]] starts shaking, you better run before it collapses, right?
* The five remaining [[EldritchAbomination Soulless Gods]] of ''{{VideoGame/Lusternia}}''. As a side-effect of devouring whole sections of the universe, they've become lynchpins for [[CrapsackWorld what remains of it]]. Consequently, they're {{sealed|EvilInACan}} (and, often, [[CardboardPrison re-sealed]]) to ensure they don't go around trying to finish the job.
* The Relic Keeper from ''VideoGame/BraveFencerMusashi'' is both a ''literal'' example as well as an inversion: the ceiling collapses when he activates to engage you at the ''start'' of the battle. He's too busy holding it up to face you directly, forcing him to send fire monsters after you instead.
* In ''VideoGame/{{Dubloon}}'', defeating FinalBoss causes the island it was on to sink, [[TimedMission and the player has to escape in time]].
* In ''VideoGame/{{Ys}} V'', the city of Kefin disintegrates after the defeat of the BigBad. In ''VideoGame/{{Ys}} VI'', the Ark of Napishtim collapses after the titular WeatherControlMachine's [[ReactorBoss core]] is destroyed. Subverted in ''III/Oath'', where Chester sinks Galbalan's Island himself in a HeroicSacrifice.
* Reimu from ''VideoGame/{{Touhou}}'' is this, but a heroic version.
* In the ''Franchise/TeenageMutantNinjaTurtles'' games from the '80s and '90s, the Technodrome, Krang's Spaship, whatever the final base is, it's guaranteed to explode upon knocking the Shredder unconscious. There is absolutely no ingame explanation for this--though a Kill Switch of some sort is the most "logical."
* Demonic and Flameye in ''VideoGame/{{Purple}}'', once killed, destroy their fortresses, forcing the player to reach the question mark orb in time.
* The [[http://www.zeldaclassic.com/viewquest.php?q=316 Zelda Classic]] Quest Lost Isle by Creator/DarkFlameWolf and Peteo had this. By defeating the BigBad [[SealedEvilInACan Morlach]], he tells you in his [[FinalSpeech last words]], that his powers alone were all the time holding back the [[ChekhovsVolcano vulcano]] from a devastating eruption, which would blow up the whole island into oblivion. Since his powers are fading away [[NiceJobBreakingItHero by your efforts]], you have no choice but to escape.
* In ''VideoGame/SyphonFilter2'', if you kill Morgan before all the bombs in the Expo Center are disarmed, the building blows up via DeadManSwitch.
* The Nowhere dimension in ''VideoGame/SilentHill1'' collapses after you defeat the Incubus.
* In ''VideoGame/VampireTheMasqueradeBloodlines'', after defeating Bach, you have few moments to talk with the guy he and his vampire hunters kidnapped. After that it turns out Bach is NotQuiteDead and he mined the place...
* In the Revenge Of Meta Knight subgame of ''VideoGame/KirbySuperStar'', every time Kirby defeats a boss, a part of the Halberd explodes. These are sort of understandable, most of the bosses are machines that are parts of the Halberd itself. Except for one. When you defeat Mr. Frosty on one of the wings, the area ''explodes for seemingly no reason''. And ''Kirby just stands there in the explosion, totally unfazed''.
* ''Videogame/SummonNight 2'' plays with the trope: A 'professional treasure-hunter' muses that he's encountered many a load-bearing boss in his time, but there turns out to be no such thing.
* In ''[[VideoGame/{{MUSHA}} M.U.S.H.A.]]'', after defeating the FinalBoss, this message pops up: "You've destroyed their main base! Escape before it blows!" Escape is automatic, but not without showing some damage.
* ''VideoGame/LegacyOfKain'': Happens to the Sarafan when they sort-of-kill Janos Audron. {{Lampshade|Hanging}}d with "The fiend intends to bury us alive!".
* The final boss of ''VideoGame/TheLegendOfDragoon'' is a spectacular example of both this and DefeatEqualsExplosion [[spoiler:The explosions of his defeat set off a chain reaction that destroys the entire moon. The load bearing portion of this trope can be justified however, since he had actually fused together with the core of the moon itself. The cause of his explosion however is not entirely clear, but it was most likely the vast amount of magical energies in his body going out of control upon his death]]
* ''VideoGame/KidIcarusUprising'': Several chapters' levels start to fall apart upon defeat of the boss. This includes chapters 8, 9, [[spoiler:12, 13, 14, 15, 16, and 17.]] It's even Lampshaded by [[spoiler:Hades]] at the end of chapter [[spoiler:14.]]
-->[[spoiler:'''Hades:''' This place is going to the dogs without Phosphora around!]]
* Once Bork (he's a Big Ork) is defeated in ''VideoGame/RuneScape'' rocks will start falling from the roof of his cave, squishing the player dead if they don't collect their loot and teleport out fast.
* In ''VideoGame/EarthBound'', defeating [[spoiler: the Mani Mani Statue]] ends Moonside and Monotoli's popularity. Averted later with the Starman DX; while the Stonhenge Base isn't destroyed, all the enemies vanish, along with the Sword of Kings, Poo's infamous InfinityPlusOneSword. The instance with Moonside is repeated with Magicant, where [[spoiler: defeating Ness's Nightmare, embodied as the Mani Mani Statue, causes Ness to wake up and Magicant to fade.]] ''VideoGame/{{Mother 3}}'' had Mr. Genetor as a load bearing boss, as his defeat causes the Thunder Tower to shut down and closes the area off forever. [[spoiler: The final boss plays with this. You beat him, nothing happens. Then you go and cause an apocalypse yourself immediately afterwards... sorta. It's more like world rejuvenation.]]
* Captain Pregzt in ''Videogame/AloneInTheDark1992'', and Alan Morton in ''Videogame/AloneInTheDarkTheNewNightmare''.
* In ''VideoGame/MetalGear'', Destroying the TX-55 (or the Super Computer in the NES version) triggers the base's self destruct mechanism, and you have to fight Big Boss while the clock is ticking.
* In ''VideoGame/PN03'', destroying Orchidee II triggers a SelfDestructMechanism with a 5-minute timer. And yes, you have to fight respawned enemies while escaping.
* ''VideoGame/ThePunisherCapcom'' ends with the King building collapsing in a cutscene after the Kingpin is defeated.
* In ''VideoGame/BrainDead13'', [[spoiler:Dr. Nero Neurosis is defeated (along with Fritz) by Lance's push of the [[BigRedButton big red "flush" button]], thereby causing the castle to self-destruct, after which Lance can escape from it (and from the [[KaizoTrap collapsing]] {{piano|Drop}}).]]
* Red Falcon in ''VideoGame/{{Contra}} III: The Alien Wars'' and the Relic of Morai in ''VideoGame/{{Contra}}: Shattered Soldier''. Also Master Contra from ''Neo Contra''.
* ''VideoGame/XCOMEnemyUnknown''. Most people wouldn't think it but this fits the trope. [[spoiler: the last level takes place on a giant enemy ship that is somehow controlled by the Uber Etherial (the final boss). When the player kills it a cutscene triggers and the ship begins to collapse into a black hole. All but one soldier run away and escape the ship before the one soldier (the Volunteer) stays behind and takes the ship into space to blow it up before it collapses. ]]
* Defeating MTHR in ''Videogame/DinoCrisis 3'' causes the Ozymandius's self destruct sequence to activate. Justified, as the ship was designed to self-destruct should the MTHR System fail.
* In ''VideoGame/SpaceQuest II'', Vohaul's asteroid base goes into a decaying orbit after his death. In ''III'', destroying the Stealth Field Generator on Ortega sets off a series of catastrophic volcanic eruptions that will kill Roger if he fails to escape in time.
* Played straight in ''VideoGame/ApeEscape 2''. As soon as Specter is captured, his Moon Base explodes for no apparent reason.
* ''VideoGame/LegendOfLegaia'' is in love with this trope. Near the beginning, defeating the Golem boss causes the cave you are in to collapse. The cave was already unstable beforehand though; the battle just shook things up a bit too much. Later on, Zeto's Dungeon collapses after defeating the titular boss. This is a bit of a strange case as the dungeon is not actually shown to collapse, but if you return to it on the world map, you'll find it "crumbled" and cannot enter it. Subverted later on in Zora's Castle, when [[spoiler: Songi shows up after you defeat Zora, and destroys the mist generator which keeps the castle afloat. The inevitable happens afterwards.]] Happens yet again with the Rogue boss; Rogue's Tower begins to break apart as soon as it dies. Yet another example is [[spoiler: Cort]] in Jette's Fortress. After being defeated, the Mist Generator self destructs and the fortress begins to crumble shortly after. He actually explicitly states "The mist generator and I are one. If I die, the mist generator dies...". He actually gets to be a load bearing boss TWICE, when he re-appears as the final boss. [[spoiler: When Cort fell and "died", he was actually consumed by Juggernaught, and proceeded to merge with him. Later, Juggernaught assimilates itself with Rim Elm, the starting village, turning into the final dungeon, and a Womb Level to boot. After travelling Juggernaught's guts, you face Cort one last time at the heart...which he is actually contained in. He destroys it when he bursts out to fight you. Guess what happens to Juggernaught's body after the battle?]]
* In the Xbox exclusive ''Breakdown'', Site Zero starts collapsing after you destroy Nexus. It's not necessarily a "boss" per se, (Though earlier, you do fight it's "avatar", Solus), but it is still a sentient being you must kick and punch into oblivion, so it fits for this trope. It's also probably justified, as Nexus was stated earlier to be Site Zero's control center.
* In ''VideoGame/DuckTales Remastered'', defeating Dracula Duck causes Mt. Vesuvius to erupt.
* In ''Mighty Morphin' Power Rangers: The Movie Edition'' for SNES, defeating Ivan Ooze causes his base's self-destruct system to activate, and the player has 99.99 seconds to escape.
* Gameplay-wise, Doc-Ock and Carnage from ''VideoGame/SpiderMan'' count as this. However, the underwater facility's destruction is not due to their defeat, but rather a pressure build-up which resulted from you sabotaging the facility's fog-producing surface vents. It had just hit critical point upon their defeat. Cue final escape level filled with explosions and [[spoiler: a nigh-unstoppable Ock-Carnage fusion on your tail.]]
* Inverted in ''Xena: Warrior Princess'' with the final boss fight, where you must lure the boss into destroying several support pillars to collapse the battle arena on top of it...and you too, if you don't run to safety fast enough.
* In ''VideoGame/Alundra2'', you have 3 minutes to escape the flying fortress after defeating the final boss.
** There's also the killer shark earlier in the game. After defeating it, the sunken ship begins to collapse, likely due to its final desperate attempt to kill you which resulted in it slamming into the ceiling and exploding.
** In ''VideoGame/{{Alundra}}'', the Lake Shrine sinks after defeating the final boss.
* ''VideoGame/RogueGalaxy'' has the Demon Battleship, which falls into a volcano and explodes after being defeated, resulting in a chain reaction that turns the whole region into a sea of lava within minutes. The party just barely escapes in time.
* In one early mission in ''VideoGame/{{Grandia}}'' the party must enter a mine and beat the Orc King there. Once you do the entire mine collapses for no apparent reason.
* In ''VideoGame/WildArms1'' and its remake, ''Alter Code F'', the Ghost Ship sinks after defeating Captain Geist. In the original, nothing happens right away, and it only sinks once you leave the dungeon. However, in the remake, the dungeon begins to collapse as soon as you defeat Geist, and you're given an overly-generous 15 minutes to abandon ship.
** In ''VideoGame/WildArms2'', the Heimdal Gazzo seemingly begins to fall after you defeat Vinsfeld. However, it is later revealed that the ship is in fact not falling, but being raised into space by its engineers, where it will be torn to pieces by the vacuum of space.
** ''VideoGame/WildArms3'' has a few.
*** After defeating Maya and her crew for the third time, she hands over the second of two highly powerful energy crystals which were being mined from the excavation site. However, she fails to mention in time that the two are made of opposing properties and cannot come into contact with eachother, or else it will result in a massive explosion...the destabilizing crystals are thrown down as everyone flees the site.
*** A somewhat bizarre example, after defeating Melody in The Unclean Mark, the place starts shaking for no apparent reason as she flees deeper inside the ruin. This continues for the entire rest of the dungeon, and some chunks of ceiling fall before fighting the next boss. After the post battle dialogue, the screen fades with everything still shaking and you are automatically taken out of it. Strangely, not a single character makes note of this at any point in time, and the ruin itself is largely undamaged and can be returned to.
*** [[spoiler: Beatrice]] plays it straight after her first defeat. She decides to blow up the Nightmare Castle, with you inside it, to generate enough energy for [[spoiler: the creation of her new world.]]
** In ''VideoGame/WildArms4'', the final dungeon collapses after the final boss is defeated. Justified, as the final boss itself had actually grown massive root-like structures throughout the entire dungeon, and one of the characters mentions that now that it is dying off, "the structural integrity of this place is about to drop dramatically!". Prior to this, the dungeon was shown to be increasingly unstable anyway. Though it is never specified, it is likely the roots damaged key support structures over time, and that they had essentially become "replacement structures" themselves...so once they began to die off, there was nothing stopping the whole place from coming down.
* The final level in both ''VideoGame/BattleZone1998'' games ends with a load-bearing boss. In ''Battlezone 1998'', after [[TheProtagonist Grizzly One]] destroys the [[spoiler: [[SealedEvilInACan Fury starship]] which is channeling power from the core of the planet]], the [[CameraAbuse planet begins to break up underneath him]] and [[spoiler: Furies]] descend by the dozens onto him as he flees back to the [[BaseOnWheels Recycler]] [[TimedMission before the]] [[EarthShatteringKaboom planet explodes]]. In ''Battlezone II'''s ISDF mission arc, destroying the ReactorBoss causes the [[spoiler: artificial planet's]] underground tunnels to begin to collapse - with [[TheProtagonist John Cooke]] still in them - leading to a harrowing TimedMission in the maze-like tunnels as Cooke tries to reach the Dropship before it leaves him behind.
* Inverted at the end of ''VideoGame/ParasiteEve'', where YOU blow up the final area in order to kill the last boss.
* The rather tongue-in-cheek ''Dungeons of Kong'' has a load-bearing boss known only as the "Ancient Evil."
* The last dungeon in Threads of Fate collapses after you defeat the final boss.
* The final dungeon in ''VideoGame/BravelyDefault'' collapses in both the true and false ending, after defeating their respective final boss.
* The final mission of ''VideoGame/StarWarsStarfighter'' has you chasing the final boss through the interior of a Droid Control Ship. When you finally take him down, the DCS starts to blow up for no explained reason. Though it was probably due to accumulated damage to the ship over the course of the mission, the way it occurs fits with this trope.
* In ''VideoGame/TheLongingRibbon'', the mansion in which the game takes place begins to collapse once the final boss is killed, and you have just over a minute to escape.
* The final boss of ''VideoGame/{{Headhunter}}: Redemption'', a computer chip heavily protected by several defense mechanisms that must be bypassed before being destroyed. Justified in that it controls all functions of the facility, and is essentially a Reactor Boss.
** Candy Floss earlier in the game may also be one. Some tremors occur shortly after his death, though it is not made clear if this is the area self-destructing, or if something else is occurring. There are a few more tremors in another cutscene shortly after though, as Jack and MW3M leave the area, so it's probably safe to assume the place was coming down.
* The {{Dual|Boss}} {{Final Boss}}es of ''Videogame/{{Vanquish}}'' are armed with tactical nukes that activate after Sam defeats them, destroying the space colony.
* Subverted weirdly with the final boss of ''VideoGame/{{Xenosaga}}: Episode I''. The last boss is [[spoiler: the reactor core of the colossal space station Proto Merkabah, which has been merged together with a massive monster.]] When you defeat it, naturally you'd think the whole place would start falling apart right? [[spoiler: Wrong, the station actually sets itself on a collision course with Second Miltia, likely a back-up plan put in place by Albedo incase you did manage to destroy the reactor and shut down the station's weapon systems. It doesn't start falling apart until KOS-MOS activates a sort of self-destruct mechanism that causes the entire station to split into hundreds of parts (kinda like a giant lego) which burn up in the atmosphere.]]
* After you defeat Bandit Keith in ''VideoGame/YuGiOhCapsuleMonsterColiseum'', the stage you were fighting on crumbles apart.
* In ''VideoGame/{{Axelay}}'', once you defeat the FinalBoss's several forms, its final form flees and the entire area explodes, but you must fend off the boss one last time while fleeing the explosion.
* ''VideoGame/ShovelKnight'' appears to play this straight, as the Tower of Fate collapses after the Enchantress is defeated. The ''Plague of Shadows'' DLC subverts this, however: [[spoiler:Plague Knight found a more interesting and explosive use for his ultimate potion.]]
* Happens at the end of ''VideoGame/TheLegendOfHeroesTrailsInTheSky: Second Chapter'', to [[spoiler: the floating city Liber Ark]] after defeating the final boss. Justified, since defeating the final boss results in [[spoiler: the removal of the Aureole, the artifact that powered the city and kept it airborne in the first place.]]
* ''VideoGame/TronTwoPointOh'' inverts the trope. Jet's first encounter with a Seeker (a powerful attack program) is in an archaic mainframe computer. The Seeker can't run on the old machine and periodically stalls out. Jet needs to defeat it to ''keep'' the old mainframe from collapsing.
* When Hailey kills ACE in ''VideoGame/Gamer2'', the virtual reality world around her starts disintegrating, and it ultimately leads to the entire game being deleted.

[[folder:Web Comics]]
* Black Mage of ''Webcomic/EightBitTheater'' [[http://www.nuklearpower.com/2004/11/06/episode-479-vulcanology/ finds this idea to be completely ridiculous]] (of course the universe doesn't care what he thinks).
* [[InvokedTrope Invoked]] in the Webcomic ''Webcomic/CaseyAndAndy'': Quantum Crook holds stereotypical EvilOverlord Mulligan as hostage to cover his escape. When the confused main characters ask why they should care about him killing their archnemesis, Quantum Crook explains this trope to them.
* Referenced (somewhat subtly) in [[http://creamybeamy.comicgenesis.com/d/20090105.html this]] page of ''Webcomic/GorgeousPrincessCreamyBeamy''.
* ''Webcomic/TheAdventuresOfDrMcNinja'': Inverted -- an ancient robot which must be defeated at tennis once a year (don't ask) breaks apart when the main character ''fails'' to defeat it; the temple housing it begins to collapse shortly thereafter.
* [[InvokedTrope Elan thinks this should happen]] at the end of the first arc of ''Webcomic/TheOrderOfTheStick''. Nobody else agrees, but they're [[http://www.giantitp.com/comics/oots0118.html too late]].
* Discussed but averted after the GrandFinale of [[http://as.crowdedstreet.net/Something Burning Stickman Presents...Something!]]. After defeating the villain, one of the heroes glances about, waits a moment...and then after nothing happens, decides the villain ''wasn't'' an example after all.
* Being GenreSavvy, the cast of ''Webcomic/{{Adventurers}}'' fully expect this to happen.
* ''Webcomic/RPGWorld'' concisely {{hand|Wave}}-waves [[http://rpgworldcomic.com/d/20030604.html this]]...before [[LampshadeHanging deferring the lampshade]] onto [[FinalBossPreview the nature of the boss]] itself.
* ''Webcomic/{{Homestuck}}''. Snowman is pretty much the ultimate example: if she dies, the ''entire universe'' goes down with her. She uses this fact to torment [[VillainProtagonist Spades Slick]] without fear of retribution, as nobody dares lay a finger on her.
** [[spoiler: She is eventually killed though, thanks to Doc Scratch's schemes.]]
* In ''Webcomic/DragonMango'', [[http://dragon-mango.com/comic/chapter02/dm02-69.htm the count's death brings down the Blackforest chateau]]

[[folder:Web Original]]
* Invoked in the famous ''EvilOverlordList,'' where it is pointed out that, even though the Evil Overlord should intend to live forever, buildings should always be reinforced, just in case.
* ''WebAnimation/HomestarRunner''
** Referenced in WebAnimation/StrongBadEmail #173, "[[http://www.homestarrunner.com/sbemail173.html the paper]]". Strong Bad is seen on a sinking island, and says to himself "How is this island sinking? I didn't even kill any end bosses!"
** Parodied in ''VideoGame/ThyDungeonman'' where, if you try enough times, you can actually "[[YouCantGetYeFlask get ye flask]]", only to be told that it was a load-bearing flask and picking it up caused the dungeon to collapse on you.
** This is referenced again in the final episode of ''VideoGame/StrongBadsCoolGameForAttractivePeople''. After finally defeating [[spoiler:Ultimate]] Trogdor, the dungeon begins to collapse. Homestar comments that he "must've been a load-bearing dragon."
* In the Forum Community/MMORPG ''Website/GaiaOnline'', one NPC builds an enormous tower that inexplicably collapses after he is shot from miles away by a BlackCloak Sniper. Like most of the ''Gaia Online'' storyline, this didn't make much sense, but looked really cool.
* Played with in the Literature/WhateleyUniverse. It's well known that Karedonia (a small island in the Caribbean enlarged by deliberate volcanic eruption) has a very unstable volcano under it, and the only thing that keeps it from blowing up is the beating heart of King Wilkins (also known as the supervillain Gizmatic).
* ''WebAnimation/{{Dreamscape}}'': Right after the Overlord of Evil is sealed away in the flashback in "Over and Under", a pillar of light shoots up from the seal and destroys his base.

[[folder:Western Animation]]
* Played with in ''WesternAnimation/KimPossible'' with the many, many lairs that get destroyed; once even {{lampshade|Hanging}}d when Kim states that she wishes just once that the bad guys' lair wouldn't blow up.
* ''WesternAnimation/JackieChanAdventures'': In the first SeasonFinale, Shendu magically restores his old palace as he prepares to release an army of dragons. Once he's beaten, the palace crumbles back into dust, along with the treasure the Dark Hand guys wanted.
* ''WesternAnimation/ThePowerpuffGirls'' episode "Knock It Off" has Dick Hardly's lair collapsing as his Powerpuff clones turn on him, with one of them telling the Professor to get him and the girls out before it's too late.
* In ''WesternAnimation/GIJoeRenegades'', after Duke defeats Cobra Commander by knocking him and his robot suit into an AcidPool, Duke and his team escape Cobra Commander's exploding mansion. [[spoiler: But somehow Cobra Commander survives the AcidPool and his CollapsingLair...]]
* The GrandFinale of ''WesternAnimation/SamuraiJack'' sees Jack finally destroy [[BigBad Aku]] [[spoiler: in the past]] once and for all. Shortly after, Aku's EvilTowerOfOminousness explodes, having been [[NoOntologicalInertia made from his essence and thus destroyed with him]].