You're in the middle of a boss fight. It's taken you hours to grind your way up to a certain experience level, fight the enemies that came before the boss room, and fight the boss villain's [[SequentialBoss five other incarnations]]. Now you're at the final incarnation, with only one hit point remaining. Not to worry, you've got just enough health potions. Or so you think.

You whittle down the boss villain's energy, using up every single healing item in your inventory. You use the biggest attack spells you can muster, and the boss finally keels over...

But not before hurling a fireball at you.

Before you can have your victory celebration, the fireball kills you. You die. Game over. And you have to go through all that crap again. From the beginning of the level.

Sometimes you're supposed to die to this attack, and then it's a case of HeadsIWinTailsYouLose. If it doesn't matter when in the fight you die anyway, it's a HopelessBossFight.

Often done by an ActionBomb. Compare KaizoTrap. See also TakingYouWithMe. The equivalent for the player characters is the DesperationAttack.
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!!Normal Enemy Examples:
* ''VideoGame/FinalFantasyVIII'' has some [[{{Mook}} Mooks]] using an HPToOne attack upon death as a plot point. [[spoiler:It hits one character in the throat, and he can't speak afterwards.]]
* In ''VideoGame/FinalFantasyX'', in the BonusDungeon and the VeryDefinitelyFinalDungeon, there's a random encounter -- not a boss, not even one [[BossInMookClothing in mook getup]] -- called the Behemoth King. When killed, he attacks with the Meteor spell, and is very capable of killing the entire party if the player hasn't [[LevelGrinding ground much]]. General strategy is to sacrifice an [[SummonMagic Aeon]] to deal the deathblow and take the punishment, or to try and arrange it so that the deathblow is dealt as a counterattack, as counters cannot themselves be countered again.
* Many, many enemies in ''VideoGame/FinalFantasyVI'' have some kind of final attack, but the most notable is the boss of the Cultist's Tower, [=MagiMaster=], who casts Ultima when he dies, which is easily capable of killing your entire party. The trick here is to reduce his MP to zero, which also kills him and prevents him from casing Ultima in his death throws.
* ''SeriousSam'' has beheaded bombers who [[ActionBomb explode upon dying]]. Also, there are biomechanoids which shoot out the last projectile when falling down.
* ''LeagueOfLegends'' is a rare player example, having three champions with passives that allow them to deal one last blow post-mortem. Kog'Maw is able to still move around after death, detonating after a delay. Zyra transforms into a plant on death, and can fire a single parting shot before expiring. Karthus can still cast his own spells after dying, but renders him immobile. Usually, this is the perfect time to cast Requiem to massively damage every enemy on the map without fear of retaliation.
* The ''VideoGame/{{Mother}}'' series has trees that make Smokey the Bear's advice look bad, with how much they tend to [[DefeatEqualsExplosion blow up]]. At lower levels, this does enough damage to constitute a potential TotalPartyKill -- thankfully, the rolling HP system in the second and third games means you can save yourself by saving the tree for last and ending the battle quickly. The first game is [[NintendoHard not as forgiving]] in this aspect.
** The [[TheMedic fuel robots]] also explode upon defeat, but are typically not encountered until later in the games, at a point where their explosions make them more GoddamnedBats instead of lethal threats. Thanks to their healing capabilities, their presence in the second and third games exist to punish those who decide to ShootTheMedicFirst.
* In ''VideoGame/NinjaGaiden 2'' for the Xbox 360, there is a giant lava turtle that explodes when you kill it, and unless you are blocking, [[KaizoTrap it will kill you as well]].
* ''Franchise/DragonAge'''s Abominations explode into fireballs upon death.
* Bob-Ombs from the ''[[Videogame/SuperMarioBros Mario]]'' games tend to explode when stomped, although there's usually a means of taking them out that doesn't set them off.
** In ''Videogame/SuperMarioRPG'', the Drill Bits also charge into you and explode, a move simply called "Last shot!"
* ''{{Spelunky}}'''s fire frogs explode when killed. This can get you into trouble, too - especially if one blows up part of a [[EasilyAngeredShopkeeper shop.]] There are also flying saucers which explode upon getting hit on impact.
* The Spawn monsters from the original ''Videogame/{{Quake}}'' are blobs that -- that's right! -- ''explode when killed.'' Combine that with their tendency to be incredibly hard to hit and get all up in your face, and you have a truly [[GoddamnedBats goddamned]] enemy to deal with.
** Some mooks in ''VideoGame/{{Quake}} II'' will, just before dying, spray one last round of bullets.
* Almost every Japanese soldier in ''Videogame/MetalSlug 3'' lights a stick of dynamite just before dying and then blows up.
* ''VideoGame/{{Doom}} 2'''s Pain Elementals release a handful of Lost Souls when they die.
* Too many normal enemies and bosses in ''WorldOfWarcraft'' to count. One of the earliest and nastiest were the bat riders in Zul'Gurub, who at low health gave you about 2 seconds warning before exploding for enough damage to kill anyone but a well-equipped (for the time) tank.
* [[{{Pokemon}} VOLTORB/GRAVELER/KOFFING/WEEZING/CLAYDOL/BOLDORE/DRIFBLIM]] used SELFDESTRUCT! (or EXPLOSION!)
** Debuting in ''Diamond'' and ''Pearl'', Stunky/Skuntank and Drifloon/Drifblim can have the Aftermath ability that damages enemies upon KO. (One's a skunk and the other's a balloon; the idea is probably is that both are filled with volatile gasses and when they lose consciousness...)
** And of course, Struggle, which is used after you run out of PP for moves or are unable to use other moves due to a move like Encore. As of Gen 4, it always causes recoil damage equal to a quarter of the user's HP regardless of how much damage it deals to the target, meaing a 'mon reduced to using it won't be sticking around for much longer.
** Gen V introduced Final Gambit, which does damage equal to the user's HP and faints the user. Like with Self-Destruct and Explosion, items like Focus Band/Sash or the Sturdy ability on the user will not save it from fainting, though they may activate for the target.
* Grunts in ''{{Halo}} 3'' go kamikaze with plasma grenades when desperate (eg if their leader is killed).
* Inverted in ''VideoGame/{{Fallout 3}}'' with ''Broken Steel''. Nuclear Anomaly, a level 30 perk, causes your character to release a nuclear explosion if you're reduced to 20 HP or less.
* Abominations in ''VideoGame/MassEffect2'' and ''VideoGame/MassEffect3'' will explode upon death. Since they usually come grouped with husks, killing them at range can actually be a way of damaging all enemies around them.
* Electro armour enemies in the remake of ''VideoGame/{{Syndicate}}'' release an AOE electric attack when killed. One achievement requires you to use it to kill at least three other enemies. Reactive armours explode when killed, with another achievement requiring you to use it to kill at least one other enemy.

!!Boss Examples:
* It's a staple of ''Franchise/FinalFantasy'' games that there will be at least one boss that casts Ultima (usually the strongest spell in the game) as it dies. In ''VideoGame/FinalFantasyIX'', it's actually a minor plot point.
** ''VideoGame/FinalFantasyIX'' also has Maliris' "Raining Swords" attack.
* ''VideoGame/FinalFantasyV'' has a few bosses that do this - most notable is the Purobolos, a PuzzleBoss where each of the six enemies cast a full-party revive spell upon defeat.
** And humorously subverted by the Minotaur in Fork Tower: it tries to cast Holy upon defeat, but since it's a physical-based boss, it doesn't have enough MP. Its counterpart Omniscient can and will cast Flare on death, though.
* In ''VideoGame/FinalFantasyVII'', the "Final Attack" Materia gives the [=PCs=] this ability, activating whichever Materia is grouped with it. Leveling up the Materia lets it be used more than once per battle. And yes, this works with anything that revives the now-dead character, Phoenix being obviously the best choice.
* The Orc King in ''FinalFantasyCrystalChronicles'' will run to the center of the arena and start glowing brighter and brighter when he gets low on health, which is your queue to finish him off as quickly as possible or take shelter in the very corners of the room, lest you get wiped out by the massive burst of energy he eventually unleashes.
* Many boss and miniboss monsters in the ''VideoGame/{{Diablo}}'' series have [=AoE=] elemental explosions that occur on death, which can be very nasty for [[FinalDeath Hard Core]] players.
** ''Diablo 2'' has the random monster attributes Fire Enchanted and Cold Enchanted not only giving their wielders elemental damage of the respective type but upon death they pull off this trope: Fire Enchanted monsters cast [[LudicrousGibs Corpse]] [[ActionBomb Explosion]] on their own corpse while Cold Enchanted monsters fire off a Frost Nova. For low-level characters, the latter is VERY nasty as cold damage slows and such monsters rarely go solo.
* In ''[[VideoGame/PunchOut Punch-Out!!]]'' for the Wii, Aran Ryan has one of these. In the first round of Career Mode, every time you knock him down, he takes a swing at you which doesn't hit. However, in Title Defense mode, he has a boxing glove on a rope that he uses like a flail. When you knock him down, he brings out the glove on a rope and tries to whack you one more time before falling down. Of course, it's not really capable of turning the tables, because he can't knock you down with it, and if you time a Star Punch right you'll instantly knock him out.
* Pretty much ''every'' boss in ''VideoGame/CastlevaniaRondoOfBlood'' throws out one last attack before they drop.
** Thankfully, this last attack ''can't'' kill you (if it would, you just [[HPToOne end up with a single sliver of life instead]]), but it ''can'' wreck your life bonus (and, if you hadn't taken any damage up until then, your hopes of being rewarded with an [[VideoGameLives extra life]] for [what ''would'' have been] a FlawlessVictory.)
* Happens in ''VideoGame/RazingStorm'' when you defeat the SpiderTank boss via a KillSat. It drops to the ground (you're on a high platform connecting two skyscrapers) and fires out a [[MacrossMissileMassacre TON of missiles]] in a bid to destroy the platform you and your squad are on, before exploding to bits. If you don't destroy enough of the missiles in time, you get a NonstandardGameOver DownerEnding where your platform is destroyed and your entire squad falls to their death.
* ''{{Splatterhouse}}'' bosses like this. In the first game, the Boreworm fight sees you fighting a small army of boreworms - and once the boss music stops, [[spoiler:the last one leaps out of a corpse on your right]]. The poltergeist boss, once defeated, ends the fight by [[spoiler:dropping the chandelier]].
* Played straight to the hilt with White, the final boss of the Playstation port of ''[[FatalFury Real Bout Fatal Fury Special]]''. At the end of the second round won against him, he shoots one last fireball out of his cane. Failure to dodge or low-block this fireball [[OneHitKill causes an instant KO]], whereupon White gets up and wins the round.
* In ''[[VideoGame/MarioAndLuigiBowsersInsideStory Mario & Luigi: Bowser's Inside Story]]'', the Dark Star will create a black hole once its HP is depleted, prompting you to [[SmashingSurvival mash the A and B buttons]] to keep the bros. from being sucked into it (which will deal a most likely fatal amount of damage).
* The Egg Genesis boss in ''VideoGame/SonicTheHedgehog2006'' tries to crash into you after its health is depleted. It isn't a OneHitKO however, rendering it somewhat ineffective if you have rings.
** By the time you've damaged the Egg Viper in ''VideoGame/SonicAdventure'' beyond repair, Sonic is left on up to four suspended platforms above a large abyss. But in the words of Tikal, "Watch out! He's up to something!" The Egg Viper's last move is to home in on you and destroy one of the platforms. Jump out of the way, quick! Unless, of course, there's only one platform left, in which case [[KaizoTrap there's nothing you can do]].
*** The Egg Wyvern in the already mentioned 2006 game is very much a homage of the Egg Viper, complete with it's own last ditch move. The wyvern flies at the last platform Sonic is standing on, but all you need to do is just jump and hit it as it comes by and you've won, [[MarathonBoss thankfully]].
** ''VideoGame/SonicTheHedgehog4''[='=]s FinalBoss does this. [[spoiler:He attempts to smash you with its fist, but shakes the ground as a result. If you don't land the final hit on him fast enough, he'll break the floor open and lead you into a BottomlessPit, costing you a life]].
** The final bosses of [[VideoGame/SonicRushSeries Sonic Rush and Sonic Rush Adventure]] do it as well. The Egg Titan tries to crush the platform Sonic or Blaze is on by ramming into it [[RuleOfThree three times]]. After the third time, you must jump onto its weak point before falling to your doom. The Ghost Titan fires two OneHitKO laser beams to the edges of Sonic/Blaze's platform and slowly aims them at the center of the stage as the robot collapses, and you must jump into its weak point when it becomes low enough to hit. Both of these attacks are pathetic, and are probably just there to add tension.
* Crocomire will attempt to attack you as a skeleton in ''VideoGame/SuperMetroid'', [[SubvertedTrope but instead]] collapses and opens the way to new rooms.
* Done very, very annoyingly with the Mecha Drago in ''VideoGame/{{Mother 3}}''. It's a WakeUpCallBoss to begin with, but many, many people found defeat based solely on his "tumbling forward" attack, which happens right after you defeat him. To make matters worse, in past games, if a character fainted during the defeat animation, they would stay alive with 1 HP. Not in ''Mother 3''.
* ''{{Runescape}}'' has Nex, which uses retribution prayer upon defeat, damaging everyone nearby. There are a few other bosses too.
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