History EvilIsNotAToy / VideoGames

** ''VideoGame/YsIIIWanderersFromYs'' [[BigBadWannabe McGuire]] finds out the hard way that Galbalan cannot be anyone's pawn and every horrible act he did was due to Garland lying to him as part of the latter's schemes to bring back Galbalan who was his master.

* In ''VideoGame/{{Undertale}}'', [[spoiler: oth Flowey and Frisk get this in the Genocide Run. Flowey doesn't realize that Chara doesn't care about them until just before the end, at which point he makes a failed attempt to warn Asgore and then an equally unsuccessful attempt to convince Chara he never betrayed them. After the completion of the run, the player sells their soul to recreate the world, which leads to Chara killing your friends in any future pacifist run]].

* In ''[[VideoGame/TraumaCenter Trauma Center: New Blood]]'', the Parnassus syndicate aims to use Stigma as a biological weapon, helping it evolve and become more infectious by spreading it and allowing it to die out naturally. Valerie Blaylock notes what a dangerous scheme this is.
* In ''Videogame/{{Undertale}}'', [[spoiler: both Flowey and Frisk get this in the Genocide Run. Flowey doesn't realize that Chara doesn't care about them until just before the end, at which point he makes a failed attempt to warn Asgore and then an equally unsuccessful attempt to convince Chara he never betrayed them. After the completion of the run, the player sells their soul to recreate the world, which leads to Chara killing your friends in any future pacifist run]].

* DoubleSubversion in ''[[VideoGame/WildArms1 Wild ARMs]]'' and the ''Alter Code F'' [[VideoGameRemake remake]]. The SealedEvilInACan, Mother, was being awakened by her Demon children. But once she was released, she told them that she was going to destroy the world, which is at odds with her children's desire to rule the world. So these Demons then ''betray'' Mother, helping the heroes to destroy Mother so that it will clear the way for them to rule the world. Mother turns out to be NotQuiteDead; she [[DemonicPossession possesses]] the leader of the Demons, thus fulfilling the trope.

* In the ''VideoGame/WorldOfWarcraft'' instance of The Arcatraz, the end boss fight consists of a guy releasing monsters to attack the players. In the end he unleashes a big alien/demon/god and gets promptly killed by it.

** ''VideoGame/SuperKirbyClash'': [[BigBad Parallel Nightmare]] falls prey to this during the [[DiscOneFinalBoss apparent]] final battle, summoning [[VideoGame/TeamKirbyClashDeluxe King D-Mind]] to do his dirty work. The first thing Kind D-Mind does is swat Parallel Nightmare away [[DropTheHammer with his hammer]], [[BaitAndSwitchBoss removing Parallel Nightmare from the fight]]. [[spoiler:During the ''actual'' final boss fight, Parallel Nightmare falls prey to this ''again'', summoning Aeon Hero[[note]] aka [[VideoGame/KirbySuperStarUltra Galacta Knight]][[/note]] after his defeat out of desperation. This time, the first thing Aeon Hero does is [[DiagonalCut cut Parallel Nightmare in half]], [[KilledOffForReal removing him from the mortal coil]].]]

* ''VideoGame/DragonQuestVI'': You can visit the ruins of Graceskull Castle, and later see why it's in ruins. [[WellIntentionedExtremist The king]] hit on the bright idea of summoning a giant demon to beat the Archfiend, the game's BigBad. Astoundingly enough, this fails and results in the destruction of the castle. [[spoiler:As it turns out, the demon they summoned is the game's {{Superboss}}. If you're sufficiently overleveled and can beat it in a few turns, the demon acknowledges your strength and [[AffablyEvil cheerfully]] [[NoSell curbstomps]] the BigBad for you.]]

** In ''VideoGame/FinalFantasyVII'', Jenova was excavated by Shinra and used in genetic experiments to create Super Soldiers. Of course, using a poorly understood [[EldritchAbomination Cosmic Horror]] in unethical human experiments turns out really badly. Most of the SOLDIERS (including the top three) go mad and TurnedAgainstTheirMasters. The cumulation of this is Sephiroth, whose hatred and will combined with Jenova's destructive instincts and power lead to the destruction of Shinra and the near destruction of the Planet. [[spoiler:Although Hojo, at least, was so crazy that he probably intended all this to happen from the start; he certainly isn't upset when it happens.]]

** Researching the rachni, the krogans, the geth or AI in general has a tendency to backfire spectacularly, [[spoiler:even if none of them are evil per se]].

** In ''VideoGame/DevilMayCry5'', [[spoiler: Vergil runs afoul of this again. After the events of ''[[VideoGame/DevilMayCry1 Devil May Cry (2001)]]'', Vergil, on the brink of death, attempted to save himself by turning the demonic katana Yamato, which he inherited from his father, on ''himself,'' using the sword's true power to split the human and demon halves of himself into independent beings. The two halves, however, cannot exist separately, and were slowly decaying away. To make matters worse, the demon half, later called Urizen, without Vergil's humanity to keep him in check, '''''nearly destroys the Earth.''''' He takes the place of Mundus as the king of the underworld, unleashing a demonic army on Redgrave City. He then proceeds to kill thousands, sacrificing their blood to the demonic Qliphoth tree, intending to consume a fruit from this tree to become all-powerful. The Qliphoth itself, when full grown, would then cause the end of everything by ''fusing'' the human and demon worlds as one. As indicated by Vergil's human side, later called V, after Vergil was recompleted at the end of the game, he was actually ''horrified'' by what he had done.]]

** In ''VideoGame/DevilMayCry5'', [[spoiler: Vergil runs afoul of this again. After the events of ''[[VideoGame/DevilMayCry1 Devil May Cry (2001)'', Vergil, on the brink of death, attempted to save himself by turning the demonic katana Yamato, which he inherited from his father, on ''himself,'' using the sword's true power to split the human and demon halves of himself into independent beings. The two halves, however, cannot exist separately, and were slowly decaying away. To make matters worse, the demon half, later called Urizen, without Vergil's humanity to keep him in check, '''''nearly destroys the Earth.''''' He takes the place of Mundus as the king of the underworld, unleashing a demonic army on Redgrave City. He then proceeds to kill thousands, sacrificing their blood to the demonic Qliphoth tree, intending to consume a fruit from this tree to become all-powerful. The Qliphoth itself, when full grown, would then cause the end of everything by ''fusing'' the human and demon worlds as one. As indicated by Vergil's human side, later called V, after Vergil was recompleted at the end of the game, he was actually ''horrified'' by what he had done.]]

** In chapter 5 of ''VideoGame/BaldursGateII'' a drow priestess summons a powerful demon lord to aid them with their planned assault on the surface elves. The protagonist has the option of tricking the priestess into offering the wrong sacrifice, upon which the demon promptly obliterates her. Her daughter then attempts the same, and again the protagonist can tamper with the sacrifice and have the demon kill her as well. The demon lord finds this ''hilarious'', and will offer you the bargain instead. If you pick the right dialogue option you'll get a cool weapon, pick one of several wrong options and you'll get incinerated. Most walkthrough guides recommend keeping your stupid mouth shut.

** In the bad ending, [[BigBad Celia]] manages to successfully unleash the SealedEvilInACan...and gives said evil the perfect motive to murder her in the process. [[HoistByHerOwnPetard Take a wild guess what happens next]].

%%* Implied from a torn-up note in ''VideoGame/DarkFall The Journal''.

** Played straight in ''Resident Evil: Outbreak File #2''. In the last level, "End of the Road" a visibly nuts Umbrella researcher releases a Tyrant to destroy the loose hunters, over the objections of the [[OnlySaneMan only competent Umbrella employee in the whole series]]. Guess how it ends.

%%* ''VideoGame/VampireTheMasqueradeBloodlines'' played with this quite epically: [[spoiler:the sealed evil is just a good bunch of TNT, but hey, works just as good]]!

* In ''VideoGame/ChronoTrigger'', the heroes have concluded that Magnus is attempting to unleash Lavos in 600 A.D., which will inevitably backfire and result in TheEndOfTheWorldAsWeKnowIt in 1999 A.D. [[spoiler:If given a chance, Magnus explains that he knows damn well that he can’t control Lavos; he’s actually trying to ''destroy'' it. Given the fact that unaltered history went on to having the Fiends lose the war due to Magus' disappearance while Lavos' influence was temporarily lessened due to the summoning, it would seem he fought Lavos and succeeded in weakening it at the cost of his own life.]]
** Also, we have the highly advanced magical floating city of Zeal, whose ruler tries to harness the power of the world-destroying Lavos. As a result [[spoiler:the queen [[GodSaveUsFromTheQueen goes insane]] and the city comes [[ColonyDrop crashing down]] when Lavos gets angry]].

** Xehanort himself initially delved into darkness to gain the strength he needed to fix what he saw as a universe filled with villains and UngratefulTownsfolk, only to visit far more suffering and destruction upon the worlds than any of them. He also came dangerously close to bringing about an even greater disaster by creating Vanitas, an AxCrazy maniac formed of pure darkness, and giving him the χ-Blade, a weapon that grants godlike power to its wielder. While Vanitas never has time to betray his master, it's made clear by the events beforehand that Xehanort was playing with fire.

* ''VideoGame/HyruleWarriorsAgeOfCalamity'': [[BigBad Astor]] believes that Calamity Ganon chose him to be his herald[[note]]a DLC cutscene gives it credence, with his being the last survivor of his cult[[/note]] and that it's his destiny to bring the world to its knees. He even claims Ganon's will as his own [[{{Hypocrite}} despite him claiming that no mortal can possess it]]. [[spoiler:[[YouHaveFailedMe After failing to put down Link and Zelda one too many times over]] and trying to command it to do the job for him, Ganon was quick to put him in his place...and that place was ''[[DevourTheDragon inside Calamity Ganon]].'']]

* In chapter 5 of ''VideoGame/BaldursGateII'' a drow priestess summons a powerful demon lord to aid them with their planned assault on the surface elves. The protagonist has the option of tricking the priestess into offering the wrong sacrifice, upon which the demon promptly obliterates her. Her daughter then attempts the same, and again the protagonist can tamper with the sacrifice and have the demon kill her as well. The demon lord finds this ''hilarious'', and will offer you the bargain instead. If you pick the right dialogue option you'll get a cool weapon, pick one of several wrong options and you'll get incinerated. Most walkthrough guides recommend keeping your stupid mouth shut.

* ''VideoGame/Bayonetta3'': Used as part of the "Demon Slave" gameplay mechanic. In the context of the story, Bayonetta needs the Infernals' power this time around to fight the [[BioweaponBeast Homunculi,]] bioweapons made from human technology. As the Homunculi are not beings of Paradiso, the demons wouldn't normally attack them. This leads Bayonetta to reveal the Demon Slave, an ancient Umbra art that enables her to forcibly take control of the Infernals so that they ''will'' destroy Homunculi. Where this trope comes in is in the rage mechanic tied into Demon Slave. If an Infernal takes too much damage in battle, they'll become enraged. While enraged, they cannot be given commands, and their attacks will harm Bayonetta herself in addition to enemies.