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11[[quoteright:312:[[VideoGame/SweetHome1989 https://static.tvtropes.org/pmwiki/pub/images/owamamiyadx.png]]]]
12
13OneWingedAngel in Video Games.
14----
15Creator/SquareEnix has [[OneWingedAngel/SquareEnix its own page]].
16----
17* ''Franchise/AceAttorney'':
18** A minor, nonfantastic version of this occurs in ''VisualNovel/AceAttorneyInvestigationsMilesEdgeworth''. A common theme in the series is for villains (especially the [[BigBad Big Bads]]) to take on different demeanors after you've exposed their true nature but before they're defeated, with one of the most dramatic being [[spoiler:Matt Engarde]] in ''VisualNovel/PhoenixWrightAceAttorneyJusticeForAll''. However, [[spoiler:Quercus Alba]] practically changes into a different person when [[spoiler: you expose him as leader of the smuggling ring. He stands up, throws away his shawl, ''snaps his cane in two'', and goes from cowering to smirking.]] And then [[ThatOneBoss shit gets serious]].
19** ''VisualNovel/GyakutenKenji2'' has [[spoiler:Souta Sarushiro/[[FanTranslation Simon Keyes]]]], who, upon being revealed as the [[TheChessmaster mastermind]] behind the recent deaths, seems to change [[spoiler:his]] makeup and demeanor for no reason other than to look awesome. And it works.
20** ''VisualNovel/PhoenixWrightAceAttorneyDualDestinies'':
21*** [[spoiler:Aristotle Means]], upon being accused of murder, will change [[spoiler: his hair into something resembling a war helmet]], then begin scowling, shouting, and throwing objects at the defense.
22*** It also has the phantom (written in lowercase), the BigBad of the game, who spent the whole of the game disguised as [[spoiler:Bobby Fulbright]] and whose "true form" is TheFaceless, as he has [[MasterOfDisguise spent so long disguising his true identity that even he no longer remembers it.]]
23*** Finally, from the DLC case, there's [[spoiler:Marlon Rimes]], who, upon being accused, drinks [[spoiler:his entire barrel]] of fish, and throws it aside. [[GrowingMusclesSequence Cue instant bulk-up]], a large fish to carry out of nowhere, a massive gold chain bearing his name, and pirate hat to top it all off, along with a much more tough and boisterous personality. And ''there'' is where you begin to understand how he got his [[spoiler:rapping career]].
24** ''VisualNovel/PhoenixWrightAceAttorneySpiritOfJustice'':
25*** A variation in the first case's villain, [[spoiler:Pees'lubn Andistan'dhin. His appearance doesn't change that much, but his attitude changes so ''radically'' it has to count for something; from peaceful monk with a dahmalan he enjoys playing to a '''heavy metal rocker''' complete with amps, extensive soloing and a much lower, growlier voice. Because of this, he is sometimes called [[FanNickname "Heavy Metal Jesus"]]]].
26*** In Turnabout Revolution, [[spoiler:Ga'ran Sigatar Khura'in]] undergoes a drastic transformation ''as soon as the trial starts''. [[spoiler:Her Royal Guard surrounds her, and then suddenly she's wearing her old prosecutor's outfit, which is [[NavelDeepNeckline very revealing]] (though it becomes a [[ImpostorForgotOneDetail plot point)]] and looks more akin to an evil sorceress outfit.]]
27*** The DLC case has [[spoiler:Pierce Nichody]], who upon being accused, suddenly starts acting more like his old occupation as [[spoiler:a surgeon]], and also [[MirandaRights goes completely silent in testimony]].
28* [[BigBad Tanzra]] in ''VideoGame/{{Actraiser}}'' starts out as a teleporting devil head, then turns into a much tougher skeleton demon.
29* In ''VideoGame/TheAdventuresOfLomax'', Evil Ed (the BigBad) transforms into a huge grotesque version of himself when defeated for the first time.
30* The final boss of ''Super VideoGame/AdventureIsland'' transforms into a freaky [[spoiler: pig-elephant-gargoyle creature]] after becoming a normal angel as you kill its normal form.
31* The final boss of ''VideoGame/AdventureIsland II'' is a larva that forms into a giant fly once destroyed. [[GiantSpaceFleaFromNowhere Yes.]]
32* In ''VideoGame/AdventureQuestWorlds'', after being called pathetic for hiding in his teddy bear disguise by Lord Krom Wrath, Deady insults him for his lack of style sense and complies with his desire to see his true form before pulling off his teddy bear head and revealing his true form to be a giant tentacled skull with white eyes with light purple pupils in its eye sockets that goes by the name of Urkor Malravenus.
33* In ''VideoGame/{{Albion}}'', the Cuain, leader of the Kenget Kamulos, [[PositionOfLiteralPower gets this as a perk with the job]]. He can turn into the avatar of Kamulos, the god of war. You fight the current Cuain and it's one of the very few real boss fights in the game.
34* ''VideoGame/AlphaPrime'' has a strange case where the hero [[spoiler:actually inflicts this upon the villain]]. The hero had previously heard that [[spoiler:Glomar's heart reacts to the thoughts and personality of those who touch it]], so he puts doubt into the villain's mind that it will not, in fact, give him power, but destroy him. [[spoiler:When the villain touches the heart, it warps his body into a hideous abomination.]]
35* ''VideoGame/AlteredBeast1988'' was built around this trope. The player(s) fight their way across a scrolling platform landscape until they have collected enough power orbs to transform into their final beastman form (with special attack!). Then, when they next run into the member of the [[NebulousEvilOrganisation brotherhood of evil]] (a bald man in a coloured robe) that inhabits that stage, he says "Welcome to your doom!" and transforms into a huge (and usually surreal) boss monster.
36* ''VideoGame/TheAngryVideoGameNerdIIAssimilation'' parodies this trope with Sir Werepire, who transforms from a vampire to a wolf, to a [[NinjaPirateZombieRobot Vampire Werewolf Knight]], to a [[OverlyLongGag Vampire Werewolf Knight GHOST]]. When his corpse rises up as a zombie, the Nerd gets fed up with the fight, ends it, and tells him to fuck off.
37* ''VideoGame/ANNOMutationem'': After C is beaten during the last battle, his body becomes weakened enough to allow Sigrid to use her [[RealityWarper ability]] to expel all the malice in his body, causing it to evolve into [[DraconicAbomination Nidhogg]], the ancient dragon from Myth/NorseMythology.
38* In ''VisualNovel/AoiShiro'', the BigBad [[EvilSorcerer Ba Rouryuu]] melds himself with the chaos-stuff for the FinalBattle inside the titular Blue Castle.
39* War, the third horseman in ''VideoGame/{{Apocalypse}}'', grows to [[AttackOfTheFiftyFootWhatever 50 feet tall]] in his second form.
40* In ''VideoGame/ArNosurgeOdeToAnUnbornStar'', [[spoiler: Zill starts an AssimilationPlot that transforms her into an extradimensional being called the Maternal Overseer]].
41* ''VideoGame/ArcanumOfSteamworksAndMagickObscura'''s final boss, if engaged in combat, transforms into a massive bone snake-dragon... thing. Although in this case, he started out as a cloaked figure (so the transformation didn't really make him more [[WhatMeasureIsANonHuman 'morally OK' to kill]]) and the dragon isn't really very good at fighting, so I guess he just thought it [[RuleOfCool looked cool]]. He was supposed to be a lot tougher, but Troika accidentally flagged him as humanoid. Humanoids are hard-coded to deal no more than 10 points of damage in unarmed combat. An unofficial patch fixes it.
42* In ''VideoGame/ArcTheLad 2'', ''every single human enemy'' will transform into some kind of monster or another before fighting the heroes.
43* ''VideoGame/ARKSurvivalEvolved'' has a storyline detailing the history of the arks through notes left by past survivors. One of these survivors is Edmund Rockwell, who progressively gets more and more obsessed with a miraculous "element" found on the ark before injecting himself with it and mutating into a grotesque Godzilla-sized tentacled monster. He serves as the final boss of the Aberration DLC.
44* A rare heroic example with the TitleCharacter of ''VideoGame/AsurasWrath''. he starts out with Two arms and can gain up to a maximum of Six arms, which is more of a SuperMode for him than anything else. The real example is the form after this one. [[spoiler: [[http://images.eurogamer.net/2012/articles//a/1/4/3/9/6/1/5/BCGame_2012_01_13_14_44_26_06.jpg.jpg/EG11/resize/1260x-1 His 4 extra arms are giantic and he looks more inhuman than ever]].]]
45* ''VideoGame/AzureStrikerGunvoltSeries'':
46** Nova from ''VideoGame/AzureStrikerGunvolt'', after being defeated by Gunvolt, proceeds to [[spoiler:absorb three Glaives and Joule and then]] become a towering, multi-armed black/white robotic monstosity that's aided by two other robots.
47** The Mysterious Girl from ''VideoGame/AzureStrikerGunvolt2'', after being confronted by Gunvolt/Copen, [[spoiler:steals their Mirror Shards and absorbs the power of the Muse from Mytyl]] and transforms into a fairy-like form [[spoiler:resembling a dark version of Joule/Lola]].
48** At the climax of ''VideoGame/LuminousAvengerIx'', Copen reaches the heart of the Sumeragi's secret bunker and is confronted by Sumeragi's AI, [[spoiler:Demerzel]], who assumes the form of [[spoiler:Asimov]]. After Copen defeats [[spoiler:Asimov, Demerzel reveals his true form, a being of pure electricity who ascended from his powers as an Azure Striker]].
49* ''VideoGame/BaldursGateII'':
50** ''Shadows of Amn'' (the original game):
51*** [[OptionalBoss Kangaxx the demilich]] starts out as a moderately tough spellcaster, then transforms into a levitating skull that is immune to magic, immune to weapons of less than + 4 enchantment, regenerates, has an [=AoE=] instant death attack, and casts some of the most powerful spells in the game, including 'Imprisonment', which not only causes instant almost irrecoverable death for the duration of the fight, but can also [[GameBreakingBug break the plot]].
52*** The player gains the ability to turn into the Slayer, an avatar of Bhaal the god of murder and a SuperpoweredEvilSide. In the final battle, the villain, having co-opted the power of Bhaal, does the same.
53** ''[[VideoGame/BaldursGateIIThroneOfBhaal Throne of Bhaal]]'':
54*** Half-dragon, partly-divine Abazigal and his son Draconis both have both a humanoid and dragon form and turn into the latter after fighting in the former.
55*** The final boss, again, is stealing the power of Bhaal for themselves and trying to become a god; they get as close as becoming an immensely powerful, giant version of themselves for the final battle(s).
56* Naturally parodied in ''VideoGame/BarkleyShutUpAndJamGaiden''. The first form is already one-winged. So what happens when it's time for its true form? [[spoiler:A dinosaur with Barkley's face on it. And not just any dinosaur, but the body of Diablo from VideoGame/PrimalRage!]]
57* ''VideoGame/BatenKaitos'' has several examples.
58** In the first game, there's Geldoblame, Fadroh, and the final boss Malpercio (who started out as a giant monster to begin with).
59** The second game has all of Malpercio's Afterlings.
60** The oddest example would be one from the first game, in that [[spoiler:after Kalas's FaceHeelTurn, he grows a second wing, as he only had one wing to begin with and had to make do with a mechanical prosthetic for the other. So... he goes from being a One-Winged Hero to a Two-Winged Villain.]]
61** Fadroh transforms into a huge, vaguely jester-looking giant monster with a crotch-mounted eye. His main special attack consists of leaning back and firing EyeBeams from his pelvis.
62** Geldoblame tramsforms into a giant, deformed monstrosity. ''With JigglePhysics''. [[FanDisservice It will make you want to blind yourself]]. [[spoiler:During the ending, he shows up once again, this time as a giant head sticking out of the ground.]]
63* Played straight for a few bosses in ''VideoGame/BatmanArkhamAsylum'', but subverted for the final battle; [[spoiler: Joker uses Titan to turn himself into a 15-foot tall hulking monster... then spends most of the fight mocking you from the sidelines while you fight waves of his Mooks, just like always.]] To be fair to the guy, this wasn't his original plan: [[spoiler: he actually wanted to force such a monstrous transformation upon Batman, then uses the drug on himself in an attempt to overcome Batman's HeroicWillpower to resist it.]]
64* In ''VideoGame/{{Beatmania}} IIDX 19'', STN (representing [[UnstoppableRage Wrath]] of the SevenDeadlySins) starts off as a mech soldier. Once you defeat him and get the Demon Feathers from him, [[GreenEyedMonster Levaslater]] and [[{{Pride}} Rche]], you unlock Neulakyussra, who represents the apocalypse. In its video, you see STN's armor crumble to reveal a white-haired man who then becomes a four-armed, three-headed being with the crests of the seven sins on each arm and head.
65* The eponymous Bendy of ''VideoGame/BendyAndTheInkMachine'' starts off as a deformed Toon. A [[spoiler: failed attempt to create]] Joey Drew Studio's star creation in fact, a demon named Bendy. His regular form is skeletal and seven feet tall. It's got horns, a [[PerpetualSmiler permanent]] SlasherSmile, and a twisted foot. It's got mismatched hands and spines sticking out of its back. In that form, he's already the strongest, fastest, most powerful thing in the studio and is NighInvulnerable. Due to him being TheDreaded, and Henry (even when he has a gun) having no weapons that can harm him, the PlayerCharacter has to [[RunOrDie run and hide]] from this form. It is TheUnfought. However, in Chapter 5, Henry decides he's going after Bendy. He goes into Bendy's lair and [[spoiler: retrieves [[SecretWeapon "The End" reel that can kill him]]]]. Bendy sees him doing this and transforms into a more threatening form. He shows off his transformation, [[spoiler: his hands and arms grow bigger, his horns grow larger, and he finally opens his mouth to reveal fangs]].
66* Dark Raven from ''VideoGame/BillyHatcherAndTheGiantEgg'' turns into a giant shadowy crow, with white eyes, and (eventually) covered in sparks [[spoiler:after he hatches the titular Giant Egg]].
67* In ''VideoGame/{{BioShock|1}}'', [[spoiler: BigBad [[FinalBoss Fontaine]] has himself pumped so full of ADAM he turns into an eight-foot tall, inhumanly sculpted humanoid with [[ElementalPowers powers of ice, fire, and electricity]].]]
68* ''Franchise/BlazBlue'':
69** Ragna the Bloodedge transforms into... some winged creature covered in shadow as part of his [[AwesomeButImpractical Astral]] [[FinishingMove Heat]]. Then reverts to his normal form for the winpose.
70** [[{{Sadist}} Yuuki Terumi]] serves as one for [[{{Troll}} Hazama]], since the latter is a vessel for the former and tends to manifest whenever they need to kick someone's ass hard.
71** Terumi gets ''another'' one in the fourth game when he recovers the armor that Hakumen currently wears, which is actually his original body to begin with and therefore, his true form. [[spoiler: It also reveals his identity as Susanoo, one of the three units that maintain the series` world.]]
72* All of the characters in the ''VideoGame/BloodyRoar'' series are capable of switching between normal human form and superpowered creature forms AND a glowing 'hyper' version of the beast form, but in ''Bloody Roar: Primal Fury'', the hyper-beast form of the true final boss, Uranus, is identical to her human form. Her beast form is a chimera, which is interpreted as blue and scaly with red lines, covered in spikes, and kind of bull-like, so yeah, it's a monster.
73** One character in Primal Fury's normal beast form...is a little, unimposing penguin. His hyper form is a ''seven foot tall phoenix-man'' perfectly capable of annihilating your world ten times over.
74** Before she was PromotedToPlayable in the second game, Uriko used a more classic example of the trope as the FinalBoss of the first. She turned from her normal child form into her Prototype Uranus form at the start of the fight, then into a big honking monster in the middle of the second round.
75* ''VideoGame/{{Bloodborne}}'': The Beast Scourge's end stage involves [[PainfulTransformation exploding]] into a werewolf (or something even worse), and bosses like Father Gascoigne and Vicar Amelia undergo this transformation as part of their boss fights, and [[WasOnceAMan many more bosses have transformed before you meet them]].
76* Parodied in ''VideoGame/BloodRayne''. The final boss of Act 2 is General Mauler, a 10-foot tall Nazi cyborg with incredible durability. When you first empty his life bar, he collapses to the ground, then gets back up again, raises his arms high, triumphantly declares "You can't beat me ''that'' easily!'', then... promptly falls over dead.
77* In ''VideoGame/BlueDragon'', BigBad Nene [[spoiler:merges with a giant eternal engine to supply himself with infinite magic power]] for the climactic showdown. And [[spoiler:the REAL final boss, Destroy. When Deathroy (the little guy by Nene's side for the whole game) swallows Nene's soul, he reveals his true form as the monster that previously ended the world.]]
78* In ''VideoGame/BodyHarvest'', the war with the aliens seems to be effectively over as Adam derails their last desperate plan and kills their leader, the colony HiveMind. [[EvilTwin The Man In The Black Suit]] who's been menacing you throughout the entire course of the game then shows up and glibly informs you that upon the Hivemind's death [[DragonAscendant he inherited all its powers]], promptly transforming into the alien behemoth Tomegatherion, the TrueFinalBoss.
79* In ''VideoGame/Borderlands2'', the final skill of Krieg's Mania skill tree is "Release the Beast", which causes him to transform into a Badass Psycho when activating his skill at low health, giving him a massive boost to damage resistance and melee damage. This causes his torso and right arm to grow to massive size while causing his left arm to shrivel up into a stump.
80* In ''VideoGame/BorderlandsThePreSequel''[='=]s DLC ''Claptastic Voyage'', you face off against 5H4D0W-TP in a penultimate final boss fight in which he uses giant versions of himself and duplicates. He still has access to the H-Source, and decides to use it to fight you. As a result, he fights you in a gigantic robotic armor suit called Eclipse, then attacks you in a duplicate of the Helios Space Station called EOS.
81* In the Wii version of ''VideoGame/ABoyAndHisBlob'', the Emperor of Bloblonia begins as a single blobby mass on a giant throne who goes down in a single hit. [[spoiler: He then flees back to WhereItAllBegan, and his form as the TrueFinalBoss is an immense, be-tentacled writhing black beast that can only be defeated with the power of [[InstantAwesomeJustAddMecha Mecha-Blob.]]]]
82* Virtually ''every'' human or humanoid boss in ''VideoGame/BreathOfFireIII'' did this. [[TheMafia Mikba]], [[RecurringBoss Balio and Sunder]], [[MadScientist the Professor]], [[spoiler:[[TragicMonster Teepo]]]], [[CatFolk Rei]] - even the main character, Ryu. Just to hit the nail in further, when Balio and Sunder combined to form Stallion ''and'' when Mikba assumed his true form, they each said, "No one has seen us/me in this form and lived!" But considering this game's great love of [[GiantSpaceFleaFromNowhere random bosses]], it's not surprising that every boss trope in the book was visited a few times. The rest of the the [=BoF=] games are just as full of transforming bosses.
83* In the climax of ''VideoGame/BugFables'', [[spoiler:the Wasp King eats a leaf from the wilted Everlasting Sapling and transforms into the Everlasting King, a {{Planimal}} version of himself with levitation and healing powers.]]
84* ''VideoGame/BurgmundTrilogy'': [[spoiler:Burgmund turns ''himself'' into [[SapientShip the Pigman Mothership]].]]
85* Creator/{{Capcom}}'s arcade game installment of the ''VideoGame/CadillacsAndDinosaurs'' franchise: stage boss Morgan (a hunchback with a sub-machine gun) transforms into Morgue (a pachycephalosaurus knock-off) when defeated. Final boss Dr. Fessenden does this twice: first into a Morgue-alike, then into a two headed [[strike: tyrannosaurus]] shivat with Fessenden growing out of its belly.
86* {{Dracula}} fills this role to the letter in almost every ''Franchise/{{Castlevania}}'' game. In this series, he's more of an ultimate evil rather than just some vampire. This started right from the get go in the [[VideoGame/CastlevaniaI very first game]] where he turned into a jumping bat demon, which is the most common transformation.
87** Drac's most grotesque One Winged Angel mutations occur in ''VideoGame/CastlevaniaSymphonyOfTheNight'': a giant bat-winged monster with three alien heads and two gigantic claws, which is actually his throne; ''VideoGame/CastlevaniaCircleOfTheMoon'': which looks like Bongo-Bongo from ''VideoGame/TheLegendOfZeldaOcarinaOfTime''; and ''VideoGame/CastlevaniaHarmonyOfDissonance'', where (sort of) Drac turns into a giant brain in a half-skull with a clawed tentacle. The last one is actually an amalgamation of all six of the Dracula relics you're required to find to get this far.
88** ''VideoGame/Castlevania64'' has him turn into some kind of 50-foot dragon/centipede hybrid. The game as a whole wasn't the greatest, but you ''will'' say OhCrap the first time you see Drac's final form. And that's ''before'' he starts throwing miniature [[NukeEm H-bombs]] at you...
89** In ''VideoGame/CastlevaniaPortraitOfRuin'', Dracula fights you [[spoiler:with Death at first, then after beating on one of them for a while, he uses Soul Steal on Death himself, absorbing him and turning into a giant demon]].
90** In ''VideoGame/CastlevaniaOrderOfEcclesia'', [[spoiler:this is notably avoided for the first time in decades, as the entirety of the final battle against Dracula is fought against the dashingly-handsome vampire we've known for so long. This may have been from the fact that the player is holding half of Dracula's power in the form of Dominus, which must be used to end the battle, but not before beating on Dracula for a good long time.]] ''VideoGame/SuperCastlevaniaIV'' did something like this as well, but as his health neared its end, Dracula's abode starts crackling with electricity again and pulses a red glow, and Dracula's head gets replaced with a demonic '''SKULL.''' This is when he starts breaking out the scary flashing lightning.
91** ''VideoGame/CastlevaniaRondoOfBlood'', and by extension the ''VideoGame/CastlevaniaSymphonyOfTheNight'' prologue, had Dracula become a huge demon that bounces slowly and isn't that hard. It's reused also in [[spoiler:''VideoGame/CastlevaniaDawnOfSorrow''[='=]s Julius mode, where Soma gives in to his powers. While the first form is classic Dracula but using soul abilities you yourself as Soma can get, the second form is the ''VideoGame/CastlevaniaRondoOfBlood'' one, except much more dangerous as while he leaps, he uses various other soul abilities.]] ''Rondo''[='=]s remake in ''[[VideoGame/CastlevaniaTheDraculaXChronicles Dracula X Chronicles]]'' has Dracula fight you with wings in his normal form AFTER the OneWingedAngel form.
92** ''VideoGame/CastlevaniaIIIDraculasCurse'' and ''VideoGame/CastlevaniaTheAdventureRebirth'' have three forms: one standard Drac, then two different transformations. You don't get to fight the last one in ''Rebirth'' if you're playing on Easy, though. ''VideoGame/CastlevaniaBloodlines'' also has a three phase final boss, but the middle phase is actually Drolta Tzuentes and not a form of Dracula.
93** And for the times when Dracula wasn't the final boss? Graham pulled a mutilated abomination throne on us akin to Symphony's Dracula; Chaos showed that it was a black orb with pulsing black prominence flares inside of a really chaotic room; Menace unrolled into a ''golem made of souls.''
94** Death does it a few times. He becomes a giant skull in ''VideoGame/CastlevaniaIIIDraculasCurse''. In ''VideoGame/CastlevaniaSymphonyOfTheNight'', he turns into a scythe-like skeletal creature. In ''VideoGame/CastlevaniaCircleOfTheMoon'', he turns into a turtle creature. In ''VideoGame/CastlevaniaHarmonyOfDissonance'', he turns into a skeletal worm with a skull and claws that floats around the screen. He's usually easier when he transforms than in his normal GrimReaper state.
95** Various other bosses sometimes have multiple forms. Examples include [[VideoGame/CastlevaniaCircleOfTheMoon Camilla]] and [[VideoGame/CastlevaniaSymphonyOfTheNight Olrox]]. Whether the first form is fought or not is a case by case basis.
96** In ''VideoGame/CastlevaniaLordsOfShadow'' and [[VideoGame/CastlevaniaLordsOfShadow2 its sequel]], all of the Lords of Shadow have a mostly human form and a form that reflects their true monstrous selves:
97*** Cornell transforms into a huge muscular man-wolf with a human(ish) face.
98*** Carmilla transforms into a hideous bat monster.
99*** [[spoiler:Zobek, the Lord of the Necromancers,]] transforms into a wizened lich. In the sequel, he changes his look into a more intimidating Grim Reaper-like figure with a skull for a head.
100*** [[spoiler:Gabriel Belmont as Dracula]] calls himself Dracul "The Dragon" for a reason. With the aid of his dragon amulet, he can tap into his full powers to transform into a mighty [[ScaledUp dragon]].
101* ''VideoGame/CaveStory'' does this multiple times.
102** You fight Balrog on [[RecurringBoss four separate occasions]]; on the third, he's transformed against his will into a giant frog.
103** In the fight against the Doctor, he starts off looking like himself. Upon defeat, he [[PowerIncontinence loses control of the]] [[PsychoSerum Red Crystal]] and transforms into a muscular berserker. After this, he dissolves into a red mist, which transforms Misery (whom you fought right before the Doctor) into a monster and forces her to fight as his [[FlunkyBoss flunky]], ''and'' he possesses the Core (which you also fought earlier in the game). So the final round of the Doctor's fight is against OneWingedAngel versions of ''three'' prior bosses. And Sue.
104** The TrueFinalBoss, [[spoiler:Ballos,]] starts off as a humanoid, then transforms into a giant, freakishly-smiling head. When you beat that, the head grows eight more eyes. When you beat ''that'', his shell partially crumbles and you can see moaning faces within.
105* ''VideoGame/ChicoryAColorfulTale'': [[spoiler: After [[FinalBoss the Brush's]] Pizza, Chicory, and Blackberry forms are bested, it quickly cycles through its other past wielders before fighting as its true form: a winged brush.]]
106* ''VideoGame/ChooChooCharles'': In the final act, [[spoiler:Charles becomes Hell Charles after you summon him and give him a power boost, which increases his size, power, and aggressiveness. He also gains the ability to teleport and won't retreat, meaning you ''have'' to kill him before he kills you]].
107* ''VideoGame/CityOfHeroes'':
108** The game has Romulus, who, after you beat him with only moderate difficulty in the third mission of his arc, [[spoiler:merges with a Nictus in the fourth]]. His new self was one of the most challenging fights in the game at the time, and even now can wipe a unprepared team.
109** Incarnate Content doesn't use this trope as often as you would think, but it does have several notable examples. The first is during the Minds of Mayhem Trial, where you fight Mother Mayhem in ''three different'' bodies before facing her true form, a humanoid psychic projection formed from dying neurons that seems to be falling apart. Diabolique does this as well, though not during her trial. When you first face her in Dark Astoria, she looks almost identical to her AlternateUniverse counterpart, Numina. After she [[spoiler:kidnaps Praetor Duncan]] she reveals her "empowered" form as a towering, {{Stripperific}} Death Goddess.
110** Finally, BigBad Tyrant skips the formalities and [[spoiler:nukes his own city before absorbing the souls of its dead]] to become a 30-foot-tall (but otherwise identical) version of himself.
111* When the Hrumians land on Planet Hivez in ''VideoGame/CombatInstinct'' 3, they grow legs and frills as the gravity is too high for them to float. [[spoiler:Their last survivor then fuses with all their corpses and ships' wreckage to become a huge killing machine.]]
112* In ''VideoGame/Conduit2'', UsefulNotes/JohnAdams infiltrates Atlantis, bringing several of his Trust soldiers in to fight you while he tries to snipe you from far away. After you damage him enough, you knock him back through a portal and end up in Agartha, the center of the Earth. There, Adams is no longer a chubby old man, but a giant, armored, and horned alien. He laughs and comments on how it had been a while since he had been in his "true" form.
113* Dr. N. Brio in the first ''VideoGame/CrashBandicoot1996'' game, who drinks his own PsychoSerum to mutate into the penultimate boss.
114* ''VisualNovel/Danganronpa2GoodbyeDespair'': Lampshaded in the final trial, [[spoiler: when Monokuma decides to skip to his "final form" and undergoes a power-up sequence that reveals him to be an AI based on Junko Enoshima, which manifests as [[AttackOfTheFiftyFootWhatever a giant version of Junko]].]]
115* ''VideoGame/{{Darksiders}}'' has a heroic example and a villainous inversion.
116** Main protagonist War ''begins'' the game as a gigantic flaming monstrosity, having been sent to play his part in TheEndOfTheWorldAsWeKnowIt. Getting BroughtDownToNormal (or as close as a Horseman can get) is what tells him that something is not right. Later in the game, he can return to his monster form at will once he gains enough Chaos and it serves as his SuperMode. In a PerspectiveFlip of this trope's usual applications, some ''enemies'' have the power to shut off this form.
117** Inverted with the final boss, [[spoiler:Abaddon the Destroyer. He starts out as a huge dragon, but after beating him enough, he reverts back to his original Angel form, although as a FallenAngel]].
118* ''VideoGame/DarkCloud'': The enormous, fat, oafish-looking Dark Genie, when destroyed, [[spoiler:turns out to have been a mouse that got sealed in the urn with the Genie, and had absorbed some of its power. Then the '''real''' Dark Genie manifests itself as a tower of muscle with no lower body, arms that can punch up out of the floor, and killer magic beams. ''Then'', when you kill it in ''this'' form, it turns into its ''final'' form -- a massive creature resembling Gospel from the ''Mega Man'' franchise]].
119* Subverted with great gusto in ''VideoGame/DarkChronicle'': the true form of the terrible Dark Emperor Griffon who has been erasing people and places out of existence is [[spoiler:a cute anthropomorphic bunny (or "Moon Person" in the ''VideoGame/DarkCloud'' world) no taller than [[KidHero Max]]]]. However, when he [[spoiler:absorbs the power of the Sun, Moon, and Earth [[CosmicKeystone Atlamillia]]]], he becomes a towering, muscular behemoth with enormous sapphire wings. During the battle with him, he can even rip off these wings to use as swords; as his power destabilizes, he grows even ''more'' muscular and his veins [[PowerGlows shine with the magic]] running through them. Defeat reverts him to his [[spoiler:small, fluffy, and adorable lapin]] form.
120* In ''VideoGame/DarkRealmQueenOfFlames'' after you shoot Olca with a magic arrow she transforms into a giant flying vaguely scorpion-ish being that can summon disgusting-looking bugs.
121* Possibly spoofed in the game ''VideoGame/TheDarkSpire'' where you encounter a "One Winged Angel" in a circus exhibit.
122* ''VideoGame/DawnOfWar'' has a few of these:
123** Chaos Champions and Heroes can function as the host of the Blood Thirster, a Greater Daemon of Khorne, the Necron Lord can transform into the [[GrimReaper Nightbringer]] or the Deceiver and an Eldar is sacrificed to bring about the [[PhysicalGod Avatar of Khaine]], though the latter isn't a game mechanic and the Avatar is produced like any other unit. It is shown in a cutscene, though; [[spoiler:they summon Khaine from a Dark Reaper aspect warrior, to fight against the Blood Ravens in the last mission against the Eldar]].
124** The chaos sorcerer Sindri Myr who does this during the intro for the final mission, screaming "bear witness to my ascension" while [[spoiler:tapping into the power of the Maledictum in order to become a daemon prince. It doesn't help, though; the Blood Ravens still kill him]].
125** A rare case where the user is on your side occurs near the end of ''Dawn of War II: Retribution'', where during the Eldar campaign, a dying Howling Banshee offers herself to the heroes to awaken an Avatar.
126* ''VideoGame/DemonHunterTheReturnOfTheWings'': After the confrontation, the FinalBoss [[spoiler:Elen]] in desperation transforms into a [[spoiler:dark-skinned angel Hanin]].
127* In ''VideoGame/DemonsCrest'', if the player gets close enough to HundredPercentCompletion to trigger it, Phalanx will use the Crest of Heaven to become [[ScaledUp a large hulking snake demon]].
128* Happens twice in ''VideoGame/DestroyAllHumans 2'':
129** In the first instance, Agent Oranchov shoots some drums of Alien spores to mutate himself.
130** in the second instance, at the end of the game, [[spoiler:Milenkov reveals his true form, a heavily-armored Blisk]].
131* ''VideoGame/DeusEx'' has [[spoiler:BigBad Bob Page]] with drastically enhanced nano-augmentations hooked up to a large ultimate augmented machine-thingy. Though it just makes him immobile, and one walkthrough even points out that he's every bit as threatening as you'd expect a naked man in a snow globe to be.
132* The "Devil Trigger" power of various ''VideoGame/DevilMayCry'' playable characters involves them turning into an uglier demonic form. This overlaps with SuperMode and LimitBreak. (More straightforwardly, bonus points to [[spoiler:Credo]] for turning into a one-winged "angel" in the [[VideoGame/DevilMayCry4 fourth game]].) [[spoiler:Arkham]] of the [[VideoGame/DevilMayCry3DantesAwakening third game]] goes from an already unpleasant humanoid demon form to an even worse blob form. His in-game profile states that his blob form is a reflection of his inner evil.
133* In ''VideoGame/{{Diablo}}'':
134** The Dark Wanderer character (Diablo in the ''Diablo 1'' Warrior's body) slowly transforms into Diablo starting from the beginning, up until just before Act 3 is completed. Similarly, Baal, having taken over Tal Rasha's body in a similar way, slowly transforms him beginning with his release prior to the completion of Act 2, until the final form seen in the opening movie (and final battle) of the Lord of Destruction expansion pack. King Leoric, the Skeleton King, also underwent a similar transformation, though he was able to resist full possession by Diablo. The Warrior's use of the soulstone may have made him more vulnerable to being possessed. Prince Albrecht succumbed immediately, though, similar to how Griswold instantly became a zombie.
135** King Leoric was able to resist because at the time Diablo had just reawakened in the Soulstone. Prince Albrecht could not resist because, as an infant, he had little (if any) [[HeroicWillpower willpower]] to resist ''with''. The Warrior fell relatively easily because most of the deeds Diablo caused in Tristan were perpetrated to strengthen himself as well as perpetuate an EvilPlan to attract a hero powerful enough to kill him in Prince Albrecht's altered form and who would think that they were able to imprison Diablo in their mind, body, and soul. By the time this plan came to fruition, Diablo had become powerful enough to gradually take over the Warrior's body, gaining a much more powerful host.
136* Happens in ''VideoGame/DiabloIII'' during the final fight in Act II, when Belial transforms into a larger version of himself when his health reached 10%.
137* ''VideoGame/DigitalDevilSaga'''s Hari-Hara has a reasonable first/first and a half form (it switches between them)... and then turns into a huge elemental core-creating thing. [[spoiler:Heat]] also does this in the second game, evolving from [[spoiler:Agni into Vritra]].
138* The DiscOneFinalBoss in ''Adventures of Rad Gravity'', Agathos, is a human mutated into a giant living brain.
139* ''Franchise/{{Disgaea}}'':
140** ''VideoGame/Disgaea2CursedMemories'' has the final boss, having [[spoiler:fake]] Zenon transform into a bizarre creature that's covered in masks.
141** ''VideoGame/Disgaea3AbsenceOfJustice'' plays it straight and lampshades it, when [[spoiler: Aurum]] takes on an angelic-looking form, which is commented on as being cliche and boring.
142** Valvatorez of ''VideoGame/Disgaea4APromiseUnforgotten'' provides a heroic example, with his final attack transforming him into a humanoid dragon. Emizel, Fenrich and Desco likewise transform in their final attacks (Ironically enough, the latter is a FinalBoss-in-training). Also lampshaded in the story, whereupon defeating [[PresidentEvil President Hugo]], Valvatorez warns the party that they're not done yet, as Hugo has "three levels of transformations, with additional power multipliers every time!" [[spoiler:And then when everybody's gotten themselves warmed up to fight those three other forms, [[SubvertedTrope Hugo just throws in the towel and admits that his power has dwindled enough that he can no longer transform]]. Valvatorez does not find this {{anticlimax}} amusing.]]
143** ''VideoGame/DisgaeaD2'' has [[spoiler:Xenolith]] become overwhelmed by his power, gaining wings, a huge LaserBlade, and BlackEyesOfCrazy.
144* In the Nintendo 64, Sega Dreamcast, and PC versions of ''VideoGame/DonaldDuckGoinQuackers'', the final boss fight has the BigBad Merlock become a winged monster by using his magic talisman to transform as he did in [[WesternAnimation/DuckTalesTheMovieTreasureOfTheLostLamp the DuckTales movie]], and also turns into a ''different'' winged monster whenever he gets hit, changing back to his normal form after he is beaten. This is averted in the other versions of the game: In the Game Boy Advance version, he only shapeshifts briefly as one of his attacks, while all other versions have him fighting Donald while still in his normal form.
145* The ''VideoGame/DonPachi'' series has the PerfectRunFinalBoss Hibachi. The battle with it begins with the Supreme Killing Weapon inside of its gigantic mecha-container (whether it's DDP's Hachi, DOJ's Kouryuu, or DFK's Golden Disaster). When ''that's'' destroyed, it reveals itself as the much smaller robotic bee with a flaming aura. And then it proceeds to [[ThatOneBoss obliterate you 6 ways from Monday]] with a [[BulletHell Category 5 storm of bullets]].
146* At the end of ''VideoGame/Doom3'', Betruger transforms into a dragon-like demon called the Maledict, which is the FinalBoss of the ''Resurrection of Evil'' {{expansion pack}}.
147* ''VideoGame/DotHackGU'': Azure Kite reveals a form called the "Azure Flame God" after the player defeats him in the first volume. The true Tri-Edge, fought at the end of volume 2, also has a transformation of this kind. Finally, in volume 3, [[spoiler:Sakaki]] also brings one out. Interestingly, most of the heroes in the games (including the protagonist) have OneWingedAngel forms alternately called "Avatars" or "Epitaphs", which they use to combat AIDA, as well as the various aforementioned transformations. These Epitaphs are... [[SuperPoweredEvilSide not the safest of powers to use.]]
148* In homage to the aforementioned Super Shredder, ''VideoGame/DoubleDragonNeon''[='=]s BigBad, Skullmageddon, transforms into Giga Skullmageddon for the true final battle.
149* In ''VideoGame/DragonAgeOrigins'', the demonically possessed mage Uldred (who is responsible for driving the Circle Tower into disarray) reveals his true form as a Pride Abomination.
150** In ''VideoGame/DragonAgeOriginsAwakening'', the Baroness does the exact same thing.
151** Should you choose to fight her, Flemeth turns into a High Dragon for her boss battle. The second game implies that this might be her true form... at least, no one has a clear idea what in Thedas she actually is.
152---> '''Flemeth:''' Perhaps I ''am'' a Dragon... if so, count yourselves lucky. The smell of burning Darkspawn does nothing for the appetite.
153** In the finale of ''VideoGame/DragonAgeII'', [[spoiler:no matter if you side with him or not, First Enchanter Orsino uses BloodMagic to transform himself into a Harvester, similar to the one from the Golem of Amgarrak DLC of ''Origins'']]. And [[spoiler:Knight-Commander Meredith's ArtifactOfDoom turns her into a floating [[PowerGlows glowing]] [[RedEyesTakeWarning red-eyed]] mutant thing. In the end, though, she gets [[TakenForGranite turned into a statue]]]].
154** The second game's ''Legacy'' [=DLC=] features an optional boss called Malvernis. He starts out as a spectral mage-like opponent, then turns into a ghostly dragon. Oddly, he turns into a flesh-and-blood dragon ''after'' you kill him.
155* Giygas, the Universal Cosmic Destroyer, from ''VideoGame/EarthBound1994''. Originally, he was a cat-like alien reminiscent of Mewtwo from ''Franchise/{{Pokemon}}''. He even had great psychic powers. However, following his traumatic defeat in ''VideoGame/EarthBoundBeginnings'', his psychic power, as well as his hatred, becomes so vast that his body and mind are completely obliterated, reducing him to a gigantic spectral maelstrom that is near incomprehensible by human standards. He resembles a monstrous reddish vortex that sports his face, twisted and screaming as if in constant agony, in the center. When Ness and his friends begin to damage him [[spoiler:through prayer and human emotion]], his defenses become unstable, causing him to expand, [[BackgroundBoss taking up the whole screen]] as he turns into a monstrous mist with multiple screaming faces all throughout.
156* ''VideoGame/EldenRing'':
157** Godrick has ''tried'' to do this via Grafting, the art of cutting off others' limbs to add to your own body. [[ClippedWingAngel It's a tossup as to how much this actually helped him]]; he's stronger, sure, but his misshapen grafted body is awkward and unwieldy, and he's still nowhere ''near'' the other demigods in strength.
158** Way later in the game, the {{Superboss}} Malenia shows him how it's done; after a brutally difficult fight where she's holding back the influence of the Scarlet Rot and still kicking your ass, she is reborn by embracing the Scarlet Rot to kick your ass ''even harder''. Her 'Goddess of Rot'' form has her going naked ([[FanDisservice the effects of the Rot make it not as sexy as it sounds]]) with wings made up of butterflies and her long hair. As the Goddess of Rot, Malenia is more aggressive, gains extra attacks (including a massive AOE that will shred you if you don't run away), and some of her moves now apply Scarlet Rot.
159** A number of bosses who have a second phase display OneWingedAngel tendencies. Apart from Malenia mentioned above:
160*** Mohg, another optional boss, actually [[SatanicArchetype grows a full pair of black wings]] as he begins zooming around the area where the fight takes place, alternating between spamming heavy-hitting attacks from his trident and erupting in blood;
161*** Rykard [[PlayingWithATrope plays with]] this trope; while his first phase, the God-Devouring Serpent, is technically a distinct entity, he does directly morph from it, as once it's defeated, he reveals an entire second face in the back of the creature's head, has a bunch of arms emerge from its body, and pulls out a massive sword from its mouth;
162*** Godfrey, while not transforming physically, proceeds to [[OffWithHisHead graphically tear off the head]] of the Beast Regent Serosh (that essentially acts as a PowerLimiter) from his body, as well as get rid of his armor. The resulting shirtless, brutish and [[{{Narm}} slightly cheesy]] barbarian Hoarah Loux who, covered in blood, screams in rage before aggressively and relentlessly pursuing you all around the arena, seeking to pummel you into a pulp with his bare hands, contrasts heavily with the much more dignified Godfrey. He also marks a sudden and intense shift not only in the rhythm of the fight, but also in how intimidating he is.
163* ''Franchise/TheElderScrolls'':
164** This is a common trait of [[OurLichesAreDifferent liches]] in the series and in background lore. While many can [[TheMasquerade maintain a facade of humanity]] using [[MasterOfIllusion powerful illusion magic]], they will switch to their powerful undead forms if they are slain, and must be defeated again. Famously, this was done by Mannimarco, a lich and the "[[AppropriatedAppellation King of Worms]]" in ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]''.
165** In ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]''[='=]s ''Bloodmoon'' expansion, this was pulled by the [[NobleSavage Skaal]] chieftain, Tharsten Heart-Fang, during [[BigBad Hircine]]'s hunt. When encountered during the hunt, Heart-Fang [[spoiler:reveals himself to be a [[OurWerewolvesAreDifferent werewolf]], transforms, and then attacks the [[PlayerCharacter Nerevarine]]]].
166** In ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]''[='=]s ''Dawnguard'' DLC, if the [[PlayerCharacter Dragonborn]] sides with the titular [[CreatureHunterOrganization Dawnguard]] against the Volkihar vampires, the final battle against [[BigBad Lord Harkon]] sees him immediately transform into his Vampire Lord form.
167* ''VideoGame/{{Espgaluda}} 2'''s 4th stage boss starts small, then becomes gradually bigger (by assimilating mechanical accessories) as he's nearing his defeat (as seen [[https://www.youtube.com/watch?v=cAd-vPODVOA here]]). Normally, in shmup games, many non-final bosses feature minor weapons or parts that are (optionally or not) destroyed or discarded, as the boss start using increasingly more difficult attacks, and this example comes as an unexpected, uncommon inversion.
168* Celestia Lindwurm, final boss of the shmup ''VideoGame/EXceed 3rd: Jade Penetrate'', transformed from a girl with wings into... a girl with larger bizarre-looking wings. Then [[UpdatedRerelease Black Package]] came along, and she instead becomes a something like [[https://www.youtube.com/watch?v=IdC6xM0H3nQ fifty-winged angel]].
169* ''{{VideoGame/Fairune}}'' 1: [[spoiler:Mega Dark grows into the monstrous Giga Dark before crossing the Bishonen Line and turning into the Terra Dark.]] Exaggerated in 2: [[spoiler:Morphoglia has a total of five forms, one of which is an upgraded, revived Giga Dark!]]
170* The FinalBoss's first form in ''VideoGame/WonderBoyIIIMonsterLair'' initially presents as a clone of the original Wonderboy riding a dragon, but for his true form, he [[TransformationTrauma grotesquely morphs]] into a green alien demon knight. Horrifying, considering this is a rather "kiddish" game, although NintendoHard. However, this form is relatively easy compared to his first form and [[ThatOneBoss a few other bosses]], thus it may be considered a ClippedWingAngel.
171* ''Franchise/FireEmblem:''
172** In the Hard and Maniac modes of ''VideoGame/FireEmblemPathOfRadiance'', upoon beating the FinalBoss [[spoiler:Ashnard]], [[spoiler:he will go berserk from using Lehran's Medallion to boost his power, forcing you to beat him a second time to finish the game. He gains {{glowing|EyesOfDoom}} {{red eyes|TakeWarning}}, and his skin becomes visibly decayed, but otherwise he averts the trope, as he keeps his human body.]]
173** The {{Final Boss}}es of Edelgard's, Dimitri's, and [[spoiler:Rhea's]] route in ''VideoGame/FireEmblemThreeHouses'' undergo a transformation before battle.
174*** In Edelgard and [[spoiler:Rhea's]] route, the final boss [[ScaledUp transforms into a giant dragon]], [[spoiler:though the reason why Rhea transforms depends on which of the two routes you chose]].
175*** In Dimitri's route, [[spoiler:Edelgard]] tranforms into a huge, vaguely humanoid... ''[[EldritchAbomination thing]]'' with long boney arms and freaky eyes.
176*** Claude's route's final boss, [[spoiler:Nemesis]], averts this, remaining as human-shaped and human-sized to the end, though pumped up with dark magic and wielding an evil version of the main character's relic weapon. Ironically, he's arguably harder than the other two final bosses.
177*** In the DLC route, [[spoiler:Aelfric]] transforms in the final chapter [[spoiler:using the Chalice of Beginnings to merge with the corpse of his beloved, who is also the protagonist's mother,]] turning into the grotesque [[EldritchAbomination Umbral Beast]] as the FinalBoss of the DLC.
178* The first five games of the obscure platformer series ''VideoGame/VirusInvasion'' put you against various forms of the Virus King as the final boss.
179** 1. At first, he's just a ScaledUp version of the normal yellow viruses.
180** 2. In the second game, he has a green cyborg form.
181** 3. When that's destroyed, he transforms into a metal form.
182** 4. The fourth game shows the metal form heavily damaged with wires coming out.
183** 5. As a sort of BishonenLine effect, the fifth game gives it a giant ''purple'' form.
184* ''VideoGame/ForsakenChronicle'':
185** Gage Novus, also SNKBoss from the first game.
186** Shin Mitchell and Shin Scourge from the ''Ultra'' sub-series count as well.
187** Ultimate Replica from ''4'' who grows wings...and horns...and a tail.
188* All three of the major bosses in ''VideoGame/GodHand'' fall into this, since they generally appear humanoid but are actually extremely powerful demons. Fat, cigar-smoking, and inexplicably Mexican Elvis turns into a [[spoiler:20-ft-tall gray giant with huge mouths for hands, another huge mouth and eyes on his stomach, and a very small featureless head]]. Succubus Shannon is actually [[spoiler:her own upper body with the lower body of a demonic cat thing and a giant eye on her face]]. Bezel, who in human form looks like a guy in a suit with gray hair and skin and long pointed ears, but in demon form is [[spoiler:first a worm with a fly-like upper body and blade-limbs, [[SequentialBoss then]] a huge fly with blade limbs. Both forms have Bezel's face on their back.]]
189* In ''VideoGame/GoldenSun'', after defeating Saturos and Menardi, they transform into the two-headed Fusion Dragon. The sequel has [[spoiler:Agatio and Karst being turned into a pair of dragons, and the final boss is also a dragon created by forcibly fusing normal people, just not evil dudes going OneWingedAngel]]. And now ''VideoGame/GoldenSunDarkDawn'' has [[spoiler:the new villainous pair being absorbed into a dark beast thing while trying to power up the morphed Volechek]].
190* The boss of "Green Inferno", the 6th stage of ''VideoGame/{{Gradius}} Gaiden'', takes on three different forms before going down.
191* For his battle against [[BigBad That Man]] in ''VideoGame/GuiltyGear'' ''II: Overture'', Sol Badguy uses the [[SuperMode Dragon Install]], but this time he finally goes all-out and unleashes his Gear form, a monstrous DraconicHumanoid with flaming wings, five eyes in the shape of his Gear Seal, a crustacean-like carapace and his word become a blade entirely composed of fire. As of ''Xrd'', Sol enters a similar but much more humanoid form whenever he activates the Dragon Install, a first for the series. It's stated that this is due to his already impressive powers growing exponentially and that even his limiter can't fully restrain his power anymore...
192* ''VideoGame/GuitarHero: Warriors of Rock'' may be considered a heroic example. The player characters turn into fearsome warriors once you complete their setlists: we've got the Headless Horseman, a [[PigMan wereboar]], a mummy, a snake woman, an elf, a demon, a hobgoblin, and a cyborg.
193* In the ''VideoGame/{{Gungrave}}'' series, many bosses become like this due to the series' PsychoSerum / {{phlebotinum}} / [[GreenRocks green rock]], the Seed drug. All of the "Big Four" bosses Grave fights usually morph to a mutated "overkill form" in the second round or as soon as he encounters them. Oddly enough, the final boss of the second game doesn't transform, he just gets some new attacks during the second phase of the fight.
194* All the stage bosses (sans the very first one) in ''VideoGame/{{Hagane}}'' transform into part-robot, part-organical creatures before taking on Hagane.
195* ''VideoGame/HardCorpsUprising'' has [[spoiler:Tiberius Chaos and Tiberius Invictus]].
196* ''VideoGame/HauntingGround'' has [[spoiler:[[BigBad Lorenzo]]]], who starts out at first as a creepy old man with paralyzed legs who can only crawl pathetically towards you. He then proceeds to turn into a much younger version of himself with seemingly superpowered punches. You defeat this version by [[KillItwithFire pushing him into a pit of fire]]. He emerges from this in his final form: a ''flaming skeleton who can kill you in [[OneHitKill one hit]]''.
197* ''VideoGame/HiddenDragonLegend'' have it's TrueFinalBoss, Zhou Zong, thanks to consuming the elixir from the Dragon Cauldron. You fight him to the end as a human, and if you win, he lets out a ThisCannotBe... before transforming into a skinless, muscular, ogre-like monstrosity several times larger than you. Cue Round 2.
198* Arfoire in ''VideoGame/HyperdimensionNeptunia''. Her final form? A dragon. It seems rather typical, but the game was also made to make fun of all video games.
199* ''VideoGame/{{inFAMOUS 2}}'':
200** [[spoiler:Bertrand.]] As a powerful Conduit, he possesses the ability to transform into a gigantic half-insectoid half-reptilian beast called the Behemoth. [[spoiler:Trouble is, it's his only ability besides transforming other Conduits into monsters, and it usually leaves him out of control until he returns to human form. As such, he's reluctant to transform into the Behemoth even in an emergency.]]
201** Inverted in the case of the Beast: he spends most of the game as a rampaging lava-skinned monster, laying waste to cities and showing no desire to communicate... up until the climax, when he transforms into a relatively ordinary-looking human to explain a few things to Cole.
202* [[BigBad Augustine]] in ''VideoGame/InfamousSecondSon'' uses her mastery of her Cement Conduit powers in the final battle to create what can only be described as a beast-like, shapeshifting cement mecha around herself.
203* Parodied in the patchwork freeware game ''VideoGame/IWannaBeTheGuy'', where after delivering the line "look upon my true form and despair!", Dracula's true form is revealed to actually be [[spoiler:'''[[Franchise/{{Kirby}} a Waddle Doo]]''' that [[AntiClimaxBoss goes down in one hit]]]]. Played straight in the final battle against The Guy. After killing his (small, humanoid) form, you ''think'' you've won, only for him to crash through the wall in the form of a giant, laser-spewing, spike-laden, ill-tempered head.
204* ''VideoGame/JakIIRenegade'' has a twist at the end where [[spoiler:friend to the Underground, Kor,]] transforms into the Metal Head Leader, a house-sized monster that can fly and shoot lasers out of its mouth.
205* Devan Shell transforms from a wimpy and nerdy turtle to a big winged turtle-demon at the end of ''VideoGame/JazzJackrabbit 2'', appropos of nothing.
206* The final showdown of ''VideoGame/JonathanKaneTheProtector'' sees the villain, Hakan Akhbar, finally stealing the sacred Aztec Mask, despite your efforts. He then puts it on and turns into a monstrous deity with lightning powers and flight abilities, that you must defeat in a lengthy FinalBoss fight.
207* ''VideoGame/JudgeDreddDreddVsDeath'': [[ExaggeratedTrope Exaggerated]] with the FinalBoss Judge Death, who's ''already'' an undead monster before he bodyjacks a mutated behemoth that's even less recognizably human.
208* ''VideoGame/KingdomOfLoathing'':
209** Parodied with particular glee, where the [[BigBad Naughty Sorceress]] reveals her supposedly true form. After you beat her in her hideous true form, she then assumes her ''actual'' true form: [[spoiler:a sausage. Then again, she is an evil sausage brimming with dark magic]]. Your character then loudly proclaims, "How many times do I have to kill you? This battle has taken over a half an hour and there's no save point!" (Said [[spoiler:sausage]] is a ClippedWingAngel, as you just have to have the [[spoiler:Wand of Nagamar in your inventory]] to beat it.
210** Later in the history of the game, Ed the Undying was introduced, who had ''seven'' forms, each ''weaker'' than the last. Even people who hate the quest in which he's involved love his dialog. In Ed's case, though, it's not so much transforming as it is [[OnlyAFleshWound coming back with progressively more body parts hacked off]].
211** Parodied with the Fallen Archfiends, a minor enemy in the Gate to Hey Deze. One of their "failed" attacks... well, a summary just wouldn't do it justice:
212--->''He glares at you and his arches glow a bright gold. "Now you will see my true... my true... ugh..." the fiend clutches his right arm, shouts "[[Series/SanfordAndSon I'm comin', Elizabeth!]]" and falls down.''
213** Played straight with the final, demon form of your Nemesis. As opposed to other examples of this trope, however, if you beat the first phase but lose to the demon phase, you can buff and heal yourself, change your equipment, even adventure elsewhere, and when you attempt the fight a second time, you don't have to fight the first form again.
214* In ''VideoGame/KingdomRush'', the FinalBoss will turn into a huge firebreathing demon after he is "slain".
215* Franchise/{{Kirby}} has faced a fair few of these:
216** Scarfy's usually look like a normal enemy, but if you try to inhale one, or hold a key in the presence of a red one it turns into a terrifying one-eyed monster that will blow itself up trying to kill you.
217** It's easy to forget that in ''VideoGame/KirbysAdventure'' Nightmare has one, as after that his main form (the one that actually like a living being), ''is'' his one winged angel form. Before that he was just a starry ball.
218** In ''VideoGame/KirbySuperStar'', there's [[spoiler:Marx, who sprouts a pair of translucent bat-like wings and now smiles madly, showing he was EvilAllAlong]]. ''[[VideoGameRemake Kirby Super Star Ultra]]'' manages to one-up on [[spoiler:Marx in [[NintendoHard "The TRUE Arena"]] -- if you get to the final battle, you will see a movie where Marx brings back his soul by absorbing Nova's power]]. [[spoiler:You will then fight Marx Soul, which is a more powerful and freakier incarnation of Marx that has an ''absolutely terrifying'' death scream.]]
219** [[spoiler:[[VideoGame/KirbysDreamland3 Dark Matter]]]] will give the people it possesses a minor example of one, such as giving King Dedede a hidden BellyMouth and the ability to float, or Whispy Woods a creepy face, but apart from that, it's victims are indistinguishable from how they normally look and act.
220** In ''VideoGame/KirbyAndTheAmazingMirror'', after beating the first four phases of [[spoiler:Dark Mind]]'s fight, he transforms into a giant flaming eyeball.
221** The final boss of ''VideoGame/KirbysReturnToDreamLand'' also pulls this twice. The first time is when [[spoiler:Magolor steals the [[CrownOfPower Master Crown]],]] he doubles in size, his body becomes blue, red and and fiery, he gains the ability to open portals to Another Dimension, create dimensions, and easily defeat [[spoiler:Landia]]. After you defeat him, he switches into a much more grotesque form with a white SlasherSmile, giant ears, and the crown wrapping itself around his body. This all because [[spoiler:he's been corrupted by the Master Crown's [[ThePowerOfHate hatred and darkness]] fueling his soul. He gets even more disturbing as [[EmptyShell Magolor Soul]]. The crown itself does this in ''Deluxe's'' Magolor Epilogue, where it merges with the restored Gem Apple Seed and turns itself into a BotanicalAbomination.]]
222** The final boss of ''VideoGame/KirbyTripleDeluxe'' does this, as well, having [[spoiler:Queen Sectonia]] do a FusionDance with the Dreamstalk to become a [[{{Planimal}} gigantic insect/flower hybrid]]. [[spoiler: After you defeat Sectonia in [[NintendoHard ''The TRUE Arena'']] she does this again, by eating 3 miracle fruit, and detaching her head to continue to fight Kirby]].
223** ''VideoGame/KirbyPlanetRobobot'': After Kirby defeats [[spoiler:Star Dream]] for the first time, it merges with the Access Ark and pulls it out from Popstar's atmosphere to continue the battle against the [[spoiler:Halberd Mode.]] Then, after that phase finishes, [[spoiler:its true face is revealed: a giant cat-like face - a face that is ''exactly identical'' to Galactic Nova from ''Super Star.'']]
224** ''VideoGame/KirbyStarAllies'':
225*** Hyness' battle starts out very easy, as he only attacks by shooting dark orbs at Kirby and using the elemental abilities of the Three Mage Sisters. But when you knock his hood off, [[spoiler:he [[VillainousBreakdown loses any semblance of sanity left in him]] and reveals his true face, with a large [[WesternAnimation/SpongeBobSquarePants Squidward-esque]] GagNose, Magolor-like ears, and bulging eyes. He then stops fighting with magic and just starts smacking the living hell out of Kirby and his allies with the lifeless corpses of his mages.]]
226*** [[spoiler:Void Termina changes forms with every phase: first, he starts out as a giant humanoid being who only attacks by punching the ground, creating [[ShockwaveStomp Shockwave Stomps]], and slashing the ground with giant blades. Then, when kirby and his friends enter his body, he reveals his "First Core", which attacks with symbols and dropping blood from the ceiling. Then, when they leave his body, his arms turn into massive wings and his legs turn into one long tail, and he begins attacking by swooping down at the Star Allies Sparkler, using the Three Mage Sisters' elemental weapons, and creating copies of the Master Crown to fire lasers. Then, when they enter his body again, he reveals his true form: a pink orb with three dots forming a face. A face '''identical to Kirby.''' He gets even stronger as Void Soul and eventually Void.]]
227** ''VideoGame/KirbyAndTheForgottenLand'':
228*** When fighting the PreFinalBoss, [[spoiler:Forgo Dedede gives up his hammers in his second phase, and starts charging at Kirby like a boar, his mind finally snapped. This is because of the boar mask that he's wearing, driving him insane and causing him to act like a wild beast. Once the mask is destroyed, Dedede is brought back to normal and calms down.]]
229*** The final boss has [[spoiler:Fecto Forgo combine itself with Elfilin (its other half)]] to become its original complete form, [[spoiler:Fecto Elfilis]], a slender flying creature with gigantic ears and a spear as a weapon.
230*** The TrueFinalBoss, as the figurine says, is "a unique convergence of elements, from native-beast souls to ethereal [[spoiler:butterfly]], gave a stubborn soul one last chance at revenge." It's the last opponent of the game's hardest BossRush, and it has everything that made the original fight difficult cranked up to maximum difficulty.
231** The final boss of ''VideoGame/KirbyCanvasCurse'' has Drawcia transforming into her true form, a giant blob of paint, dubbed "[[spoiler:Drawcia Soul]]".
232* ''VideoGame/{{Klonoa}}:''
233** Joka from ''VideoGame/{{Klonoa}}: Door to Phantomile'' has the ability to change between his normal floating-jester-balloon form and a conspicuously monstrous form which resembles some sort of sea monster. This form is invincible, but can only be used during an eclipse; he can be forced to revert by stopping the magically-caused eclipses taking place during his boss fight.
234** In ''Klonoa Heroes: Legendary Star Medal'', he has a different 2nd form: "Flower Joka", which is his normal self, except flower-shaped instead of spherical. Again, he shifts between this and his normal form during the fight, this time at will; luckily, his Flower Joka form can be damaged as normal.
235** ''VideoGame/{{Klonoa}} 2: Lunatea's Veil'' features a variation: [[spoiler:Leorina, thought by the heroes to be the BigBad, is ''forced'' to go OneWingedAngel by the real BigBad, the King of Sorrow. She's not the FinalBoss, either. Surprisingly, the King of Sorrow does not go OneWingedAngel during his boss fight, instead preferring to attack you from within a weird orb thing]].
236* Scotia, the final boss of ''[[VideoGame/LandsOfLore Lands of Lore: The Throne of Chaos]]'', as soon as the fight starts, transforms into a giant toad, like the ones you encountered earlier in the game, then, after taking some damage, into a snake-like monster, and finally into an invincible quadrupedal monster with toothed tentacles. The only way to beat the game is using the Ruby of Truth to prevent one of her transformations (ideally the first one).
237* The end boss of ''VideoGame/TheLegendOfDragoon'' had four different forms, each one [[WhatDoYouMeanItsNotSymbolic symbolizing]] one of the seven days of the creation of the world. None of them actually looked like anything in particular.
238* ''Franchise/TheLegendOfZelda'':
239** ''VideoGame/TheLegendOfZeldaALinkToThePast'': After Agahnim is defeated for the second time, he transforms into his true form: the pig-like Ganon.
240** The final boss of ''VideoGame/TheLegendOfZeldaLinksAwakening'', the Shadow Nightmares, shifts through six forms in rapid succession. The first few are based on Link's memories of bosses from this game and ''A Link to the Past'', including Agahnim and Ganon. Its final form, [=DethI=], is a particularly monstrous beast with a single eye and giant claws. It can only be damaged when [[GoForTheEye its eye is open]].
241** In ''VideoGame/TheLegendOfZeldaOcarinaOfTime'', you first fight Ganon's phantom incarnation on horseback, then him personally first as evil sorceror-king Ganondorf, after which he calls upon the Triforce of Power to transform into the shadowy boar-monster Ganon.
242** In ''VideoGame/TheLegendOfZeldaMajorasMask'', the final boss of the same name progresses from a mask with hair/tentacles (Majora's Mask) to a mask with arms and legs (Majora's Incarnation) to a giant, psychedelic, whips-for-arms demon (Majora's Wrath). It was also notable for allowing Link a [[EleventhHourSuperpower supreme transformation into the Fierce Deity]], only usable against bosses but still near-impossible to lose with.
243** ''VideoGame/TheLegendOfZeldaOracleGames'':
244*** Subverted in ''Oracle Of Ages'' by the game's BigBad Veran: Her true form is human, but she immediately transforms into something that looks like a "mutant fairy", and her final "combat form" (which were actually three in one) is so ridiculous that she feels humiliated by having to resort to it.
245*** General Onox of ''Oracle Of Seasons'' plays it straight by revealing his true form to be a giant skeletal dragon.
246** This also applies to Vaati in ''VideoGame/TheLegendOfZeldaTheMinishCap''. At the beginning of the battle, he morphs from his human form into a taller, more powerful-looking version of himself, and after ''that''[='=]s beaten, he changes completely into a giant, spherical beast with one huge eye and giant claws -- very much resembling [=DethI=].
247** In ''VideoGame/TheLegendOfZeldaTwilightPrincess'', Ganondorf transforms early in the fight. The twist being that, this time, Link does it too. Also inverted in that you fight Ganon's human form ''[[BishonenLine after]]'' you fight his monster form in this game.
248** Bellum from ''VideoGame/TheLegendOfZeldaPhantomHourglass'', however, is harder to classify. He starts out as a big, squid-like monster covered in eyeballs, then progresses to a ''possessed battleship''. Once that's out of the way, though, he actually assumes a much smaller, humanoid form, via [[spoiler:possessing Link's buddy Linebeck]].
249** Malladus, the final boss of ''VideoGame/TheLegendOfZeldaSpiritTracks'', attains his last, monstrous form by taking over Chancellor Cole's body, mutating it in the process. In a strange coincidence, the result ends up looking somewhat like Ganon's Dark Beast form from ''Twilight Princess'', only more goat-like than pig-like.
250** Then ''VideoGame/TheLegendOfZeldaSkywardSword'' goes and inverts it, having the final boss [[spoiler:Demon King Demise]] fought several times in a monstrous, demonic form before assuming his true, humanoid form for the final battle. Meanwhile, Ghirahim turns into a ChromeChampion for his final battle. This is alluded to in the game when Fi mentions that his muscle mass went up by 90 percent in that form.
251** ''VideoGame/TheLegendOfZeldaBreathOfTheWild'' has the already monstrous Calamity Ganon, whose first form resembles a fusion of the bosses from the Divine Beasts. After besting it, it transforms into [[spoiler:Dark Beast Ganon, which resembles a massive boar made of Malice.]]
252** ''VideoGame/TheLegendOfZeldaTearsOfTheKingdom'' sees Ganondorf return. When first encountered, he resembles a withered mummy, but when it comes time to fight him, he assumes his Gerudo form. The second phase of his fight has him take on his Demon King form, which blackens his body, makes his hair glow red, and gives him BlackEyesOfCrazy along with a power boost. Then when you beat this form, [[spoiler:he swallows his [[PowerGem secret stone]] and mutates into a Demon Dragon, so massive in scale that its body eclipses even the Light Dragon that joins you in the battle.]]
253* ''VideoGame/LibraryOfRuina'' goes to the [[ExaggeratedTrope next level]] by having ''every single'' Reverb Ensamble member get a new form as they're ''[[BossRush all]]'' fought as the FinalBoss:
254** [[TragicVillain Philip/The Crying Children]] is a literal example, becoming a fusion of his Distorted form and his E.G.O armor, gaining a single huge flaming wing and a red halo above his head, all the while holding what seems to be a miniature eclipsed sun in one hand.
255** Eileen turns into a mechanical angel that looks like it's made of porcelain.
256** [[ThreateningShark Greta]] is a downplayed example, simply gaining more eyes and going [[WalkingShirtlessScene shirtless]] to show off even more monstrous mouths covering her body.
257** The Musicians of Bremen become an amorphous blob-like creature with their animal masks as 'heads' and tubas growing out of their body.
258** [[MonsterClown Oswald]] gains a new outfit, sporting a more jester-like hat and a long cape, as well as four additional arms.
259** [[WolfMan Tanya]] turns into an Anubis-esque form with a shadowed face and golden, glowing tattoos across her body.
260** Jae-Heon/The Puppeteer turns into a bandaged patchwork monster with spider legs growing out of his back.
261** [[VampiricDraining Elena]] transforms into a vampiric monster made of blood, alongside glowing red eyes and CapeWings.
262** [[DealWithTheDevil Pluto]] turns into a skeletal black-and-gold demon with long horns, bat wings, and a golden pentagram on his chest.
263** Finally, [[BigBad Argalia]] fuses with his outfit, his head turning into a vortex with his hair turning into what looks like clouds, and in the middle of his head, at the center of the vortex, is a singular glowing blue eye. He also gains a new SinisterScythe in the process.
264* Ursula does this as the FinalBoss of the ''[[VideoGame/TheLittleMermaid Little Mermaid]]'' game, turning into a monstrous Kraken-mermaid hybrid like she does in the movie. She repeats the action once again in ''VideoGame/KingdomHeartsII''.
265* ''VideoGame/LuminousArc'': the last boss turns into a beautiful white feathered serpent with lots of angel wings for its final form. ''VideoGame/LuminousArc2'' does a similar thing as well, except it resembles a fiery phoenix/giant plant.
266* In the original version of ''VideoGame/LunarTheSilverStar'', the main villain would announce that it wasn't over after being defeated. He then turned into a rather stereotypical anime demon for no explicable reason. In the ''Silver Star Story Complete'' remake, this transformation was left out completely. Chalk it up to cliche overdose.
267* In both versions of ''VideoGame/LunarEternalBlue'', [[{{Satan}} Zophar]] has multiple forms. When he finally appears on-screen, he's this giantic EldritchAbomination, but after he kidnaps Lucia and takes Althena's power, that form turns into his fortress and what he turns into... [[FanDisservice saying he looks like a crossdresser would be an understatement]]. [[DidYouJustPunchOutCthulhu Despite how powerful the plot makes him out to be, the general opinion is that he is very easy]], which even the game's characters seem to notice, but then he goes into his ultimate form, in which he takes up a big chunk of the screen. In the original version, he still looks very feminine, but in the remake, the designers realized they freaked the player out enough and made him look more masculine. Both versions, you can't hurt him until Lucia frees herself. His first form was just a warmup, really; his 2nd is going to a nightmare unless you've done a lot of level grinding. He has one more form after that, which you only fight with Hiro and Lucia. This form is, not supriousingly from the look of it (a chunk of his upper torso attached to his head in the original, and a wierd disembodied beak in the remake), is a cakewalk even though you only have two characters (Zophar's 2nd form was meant to be the ultimate challenge of the game, the 3rd one is practically a scripted fight).
268* In ''VideoGame/LEGOIndianaJones 2'', the end bosses of ''Raiders'' (Belloq), ''Crusade'' (Donovan), and part 2 of ''Crystul Skull'' (The Soviet Colonel) are all given a One-Winged Angel makeover, in forms that overlap with RentAZilla.
269* Several overlords in ''VideoGame/MakaiKingdom'' ''start'' in OneWingedAngel mode, instead crossing the BishonenLine when they go all out... The exception to this amongst those with 'true' forms is the otherwise humanoid [[JokeCharacter King Drake the Third]], whose 'true' form is... Um... [[Manga/SazaeSan Unusual, to say the least]].
270* Parodied in ''VideoGame/MakaMaka'', where the final boss starts out looking like a baby doll. After beating up on him enough, he turns into his FINAL FORM... [[ClippedWingAngel only to go down after one hit]].
271* In ''VideoGame/MarvelVsCapcomClashOfSuperHeroes'', the final boss Onslaught has two forms. His first form is his standard armored form who strikes out with a variation of Magneto's attacks from ''VideoGame/XMenChildrenOfTheAtom''. His second form has him grow larger, dump the helmet in favor of a metallic face and resort with energy blasts and striking you with his Mighty Hand.
272* In ''VideoGame/MassEffect1'', when you confront Saren for the last time [[spoiler:in the ruined Citadel control room]], he is initially in his (admittedly rather warped) normal form. However, [[spoiler:after he is defeated or convinced to commit suicide (it depends on your dialog choices beforehand), the Reaper Sovereign uses its power to transform him into a large, spindly biomechanical monstrosity with exposed ribs and movements very similar to the earlier geth hopper enemy types, albeit far more dangerous. Whereas Saren's first form is a humanoid character not unlike some of your party members (Garrus and Tali, for instance), his second is a highly mobile quadruped that vaguely resembles a metallic, skeletal lion. Only with [[BodyHorror the top half of his face still attached]].]]
273* ''VideoGame/MassEffect3'' has [[spoiler:the Illusive Man augment himself even further with Reaper technology for the final confrontation, causing his face to start to peel off, revealing the cybernetics under it]]. [[spoiler:However, this is ultimately a subverted example, because [[TheUnfought you don't get to fight him:]] Shepard either [[TalkingTheMonsterToDeath convinces him to commit suicide]] or shoots him in a QuickTimeEvent.]]
274** [[spoiler:The initial design for the game, however, had this in mind. The art book for the game has concept art for the Illusive Man's massive, grotesque final boss form. Ultimately, it was decided that this trope had no place in the overall design because it goes against the Illusive Man's character as TheChessmaster MagnificentBastard, thus leaving the game without a true final boss.]]
275* After you blow up his mech in ''VideoGame/MechanicMan'', [[spoiler:Dr. Bronze uses his hat to transform into a suit of PoweredArmor]].
276* ''Franchise/MegaMan'':
277** Sigma does this at the end of almost every ''VideoGame/MegaManX'' game, going from his humanoid form to usually a giant battle body built just for this occasion. Unlike most examples though, he isn't actually transforming; his humanoid body ''explodes'' and either his head or his [[VirtualGhost malignant AI]] simply transfers to the giant robot to control it. Ironically, according [[AllThereInTheManual official works]], he has a bad habit of [[UnfinishedUntestedUsedAnyway not getting them fully tested or even finished]] before he's forced to use them, something he even admits to in a few games.
278** Subverted in the final battle of ''VideoGame/MegaMan2''; Dr Wily appears to morph into a green alien and the background changes to a starfield. After you defeat him, however, it turns out it was just a virtual reality machine.
279** ''Zero'' is pretty fond of this as well. Not only do the various final bosses transform at least once, the [[EliteFour Four Guardians]] also transform. Interestingly, in the third game, it was played straight and inverted, the former between Omega's large first form to the enormous second, and the latter to [[spoiler:Zero form, with its own legitimate battle rather than [[ZeroEffortBoss Zero-Effort Boss]] scene (no pun intended)]]. Subverted in the same game [[spoiler:when Copy X, former FinalBoss now DiscOneFinalBoss, ''tries'' to go OneWingedAngel like before, but ends up triggering the self-destruct put inside his body by Dr. Weil for this very moment and killing himself]].
280** While certainly not monstrous or one-winged, in ''X8'' the TrueFinalBoss [[spoiler:Lumine]] not only [[spoiler:triggers an angelic battlefield platform]], but also [[spoiler:grows six wing-like mechanical limbs from his back, now has bright red, slitted eyes, thin, long, and pointed fingers, and has a red crystal produting almost a foot out of his chest]].
281** While ''VideoGame/MegaManZX'' plays this straight with Serpent first Megamerging with his Model W fragment [[EvilCounterpart paralleling Vent/Aile's own transformation]] before merging with the [[ArtifactOfDoom Model W Core]], ''Advent'' ''inverts'' this in that Master Albert ''starts'' the two-phase fight by fighting inside his transformed throne turned giant-three-headed dragon, then crosses the BishonenLine after it's destroyed [[spoiler:to become the angelic [[UltimateLifeForm Ultimate Mega Man]].]]
282* ''Franchise/{{Metroid}}'':
283** In ''VideoGame/SuperMetroid'', you blast away at Mother Brain in her storage container, like in the first game, until the case explodes and she drops to the floor, dead. [[BringMyBrownPants And then she grows a body]].
284** [[PlayingWithATrope Played with]] in ''VideoGame/MetroidPrime''; the titular monster does this prior to the events of the game (by creating an armored exoskeleton armed with missiles and various energy weapons), and inverts the trope when you fight it (reverting to its core form once the exoskeletal form is defeated).
285** In ''VideoGame/MetroidFusion'', the SA-X's form after being defeated in its Samus form is [[ClippedWingAngel a freakish, crossbred monster]], then a Core-X.
286** ''VideoGame/MetroidPrime2Echoes'':
287*** Emperor Ing goes through two very bizarre alternate forms during the battle against it, with the second form being a cocoon for his final form. Also, the larval Chykka metamorphoses into its dragonfly-like adult form midway into the fight. Dark Samus has also undergone a serious mutation as a result of chowing down on too much Phazon and is nigh invulnerable.
288*** Any time an enemy gets controlled by an Ing mid-fight (the Alpha Sand-Digger and Alpha Splinter are prime examples).
289** ''VideoGame/MetroidPrime3Corruption'' has [[EvilTwin Dark Samus]] merge herself with Aurora Unit 313 to provide the final boss battle.
290** ''VideoGame/MetroidDread'' has [[spoiler:an extremely rare heroic example in Samus herself, who, due to the full awakening of her Metroid genes, mutates her Power Suit into a green, Metroid-esque suit that allowed her to copy Raven Beak's Hyper Beam. However, this also causes her to lose control of her energy-draining abilities.]]
291* ''WesternAnimation/MickeyMouse'' games:
292** During the final battle with Mizrabel in both the UsefulNotes/SegaGenesis version of ''VideoGame/CastleOfIllusion'' and the HD remake, Mizrabel uses Minnie's youth and beauty to transform herself from an ugly old witch to a beautiful young woman. This is actually an inversion of Queen Grimhilde's "perfect disguise" in ''WesternAnimation/SnowWhiteAndTheSevenDwarfs'', which makes sense since Mizrabel's character model is based on that of the Queen's.
293** After Mickey defeats the Sorcerer of Darkness in his normal form in ''VideoGame/LegendOfIllusion'', the Sorcerer transforms into a dragon and Mickey has to fight him in this form.
294** In ''[[VideoGame/DisneysMagicalQuest The Great Circus Mystery Starring Mickey and Minnie]]'', delivering a couple of hits to Baron Pete will make him transform into a dragon, leaving Mickey and Minnie to continue fighting him in this form.
295* ''Monster Girl Quest!'' has ''every single boss'' in its final BossRush do this. Though of them, only Ilias is fought in her normal form right before transforming. Eden instead transforms before attacking you, while Promestein and Black Alice have their normal form fights occur earlier in the game. The one thing they all have in common is their One-Winged Angel forms being enormous masses of tentacles (and other things).
296* The boss of ''VideoGame/MonsterMadness: Battle For Surburbia'' is Mr. Huggles, a parody of Barney the dinosaur. At first, he attacks by singing and hugging. After you fight him, his suit comes off, revealing his hideous true form, a slimy Jabba The Hutt-like creature.
297* ''Franchise/MortalKombat'':
298** The series has this in almost all of their later games, including Zombie Liu Kang from ''VideoGame/MortalKombatDeception''.
299** ''VideoGame/MortalKombatMythologiesSubZero'' has Shinnok transform into a polygon demon once Sub-Zero takes the amulet, but fighting him in this form is optional, as a portal leading to the end of the game opens up anyway.
300** [[spoiler:Shinnok's demon form]] ends up being the hyped [[UnexpectedCharacter surprise final boss]] in ''VideoGame/MortalKombatX''.
301* In ''VideoGame/Mother3'', [[spoiler:Miracle Fassad]] fights like an upgraded version of his previous fight. After dealing enough damage, however, [[spoiler:he reverts back to his New Fassad form and reveals that he is a PSI user, using high level PSI, including Starstorm]].
302* The final boss of ''VideoGame/LaMulana'' is Mother, who takes five forms: [[spoiler:a large stone face, a white flying silhouette, a disturbing Virgin Mary look-a-like complete with what resembles Baby Jesus in her arms, a pair of eyes, and finally, a smaller but no less deadly version of her second form]].
303* In ''Mutation Nation'', the wimpy BigBad suddenly collapses and morphs into a huge monster right as you meet him.
304* ''VideoGame/MysticHeroes'' has [[spoiler:Emperor Kang's son, Cyrus, transform into a ridiculously ugly (and poorly rendered) dark greenish monster for the real final battle]]. The fight is somewhat lengthy, though, so be sure to take your time on this one.
305* ''VideoGame/MSSagaANewDawn'': The final boss starts off piloting the [[http://www.mahq.net/mecha/gundam/cca/nz-333.htm Alpha Azieru]] from ''Anime/MobileSuitGundamCharsCounterattack''. Defeat that, and he uses the G-System to reconfigure it into...a demonic-looking version of the [[http://www.mahq.net/mecha/gundam/endlesswaltz/xxxg-00w0.htm Wing Zero Custom]] from ''[[Anime/MobileSuitGundamWing Gundam Wing]]'', complete with two pairs of realistic black wings.
306* Oogie in ''VideoGame/TheNightmareBeforeChristmasOogiesRevenge'' turns into a giant monster after merging himself with mountains of bugs and trash.
307* ''VideoGame/NinjaGaiden'':
308** In the original NES series, the final villains (Jacquio, the Demon, some stupid scientist) all go through transformation sequences as Ryu defeats their forms successively.
309** In the game for the Xbox and its {{Updated Rerelease}}s, humanoid Fiend Alma turns into a scorpion-like thing once her power gets Awakened. After Doku sheds his corporeal shell, he loses his legs to float and gains a nodachi worthy of the One Winged Angel himself. The Vigoorian Emperor goes from a vaguely angelic statue to a bony creature made of skulls.
310* ''VideoGame/NosferatuTheWrathOfMalachi'': When you first see him, [[spoiler:Lord Malachi]] looks like a large man encased in bone with a giant skull and set of bones attached to his back. When he wakes up, [[spoiler:the bones expand and uncurl and he transforms into a giant skeletal horned demon dog ''thing'']].
311* Played with in ''VideoGame/NoMoreHeroes2DesperateStruggle'' with Jasper Batt Jr. Played fairly straight for his second form, for which he [[spoiler:injects himself with steroids and dons a themed superhero costume (not unlike Batman's), before unleashing hell on you]]. Outright spoofed with his ridiculous third form, for which he [[spoiler:somehow turns into a massive flying mascot-like balloon version of his former self -- with a good dose of ClippedWingAngel, for this battle is ''much'' easier than the second phase]].
312* Mr. Big of ''VideoGame/{{NARC}}'' is a fat man in a wheelchair who fires rockets while dozens of his henchmen dogpile you. After he is killed, he comes back as a giant head on a floating platform whose flesh gets blown off to reveal a giant metal skull.
313* The final boss of ''VideoGame/{{Odium}}'', [[spoiler:Vasili Dobrovsky]], bursts into the room as a human, provides some exposition while announcing that he's the only man immune to the ViralTransformation that turned everybody into monsters, and when he's outed as TheDragon, he proceeds to turn into a giant monster anyway.
314* ''VideoGame/OracleOfTao'' frequently uses this trope. Not only does one of the middle game bosses [[ClippedWingAngel do this]], but the final boss of the game does it ''twice'' once during the normal conditions (two forms, unless you also count the one he abandons before the battle even starts), and again if you qualify for the PlayableEpilogue (3 more). To say nothing of enemies that cheat the HP limit by having multiple attack patterns with the same form (one of those you have to kill nine times).
315* In ''VideoGame/OverlordII'', the final boss encounter is [[spoiler:the Great Devourer. The Emperor, having gathered magic from across his kingdom, submerges himself in it and is transformed into a massive, glowing, zombie-spewing larva]]. [[https://www.youtube.com/watch?v=fD9ozfDzRsM&feature=related Link]].
316* ''VideoGame/{{OFF}}'' has Elsens, who become Burnt and start spouting fountains of a thick dark substance, possibly blood or smoke, from their heads, sometimes gaining huge claws in the process, Japhet, whose real [[spoiler:phoenix]] form comes bursting out of his cat form [[spoiler:which is an actual cat named Valerie]], and [[spoiler:The Batter, who turns into a.... ''[[HumanoidAbomination thing]]''. Or maybe he was one all along, we never know, but it's pretty freaky]].
317* ''VideoGame/PanzerDragoonSaga''. In a single, long, psychedelic battle, you first fight [[spoiler:the five extreme forms of your own dragon]], then Sestren -- the final final boss, who changes into an even more horrible form.
318* ''Franchise/{{Persona}}'' series:
319** ''[[VideoGame/Persona1 Revelations]]'' does this to its BigBad, Guido, when you defeat him. The associated dialogue is just too ridiculous, funny, and {{Macekre}}d to not include:
320--->'''Guido:''' This can't be! I'm a God! I'm invincible! ''[pauses]'' Something's invading my body!!
321--->'''Massacre's voice:''' Hahaha! Stupid human, I shall give you the power you desire!
322--->'''Guido:''' Stop!!!!!
323--->'''Mary:''' What's happening?
324--->'''Mark:''' What the heck!?
325--->'''Nate:''' He was taken over by his own Persona!
326--->'''Guido:''' Now I'm Super Guido!
327** The FinalBoss of the [[VideoGame/Persona1 first game]], Pandora, also goes through this, doubling also as BishonenLine: her first form is that of a horrifying, multi-limbed, [[FreudWasRight vaguely phalloid]] creature. Her second form is that of a completely humanoid, giant naked woman with butterfly wings [[spoiler:who resembles Maki. Makes sense, considering that in a way, it ''is'' her]].
328** In ''VideoGame/Persona2: Innocent Sin'', Nyarlathotep first fights the party as Hitler, then transforms into a monstrosity that's way too hard, considering [[JustToyingWithThem he's just screwing with the party by that point]]. Later in ''Eternal Punishment'', he gets slightly more serious, fighting in his default form of the Moon Howler, and once you beat on that enough...
329--->'''Nyarlathotep:''' Fuhahahaha! This is! Splendid! You are the first to see this form! Die with my highest praise!(sic)
330** He turns into a tentacle monster instead of an angel. Considering the Tabletop RPG above and that he was behind Guido's transformation before being {{Macekre}}d out, it becomes obvious that the Crawling Chaos just can't stay away from this trope.
331** From ''VideoGame/Persona3'', [[spoiler:the Appraiser of Death]] first shows up in human form ([[spoiler:two of them, in fact]].) When it is time to make a choice concerning the fate of the world, he claims that he will soon turn "into something unrecognizable" -- sure enough, during the Dark Hour of the Promised Day, [[spoiler:he becomes Nyx Avatar, the Shadow of the [[TarotMotifs Death Arcana]] with four midnight-black wings and a grinning white mask]]. She has [[MarathonBoss 14 phases]]. [[spoiler:And that's just Nyx '''Avatar'''. The real Nyx resides [[WeirdMoon inside the Moon]], and is only reached when the Protagonist's bonds let them attain [[EleventhHourSuperpower the Universe Arcana]]. All leading to one final [[PostFinalBoss Post-Final]] DuelBoss.]] [[labelnote:Spoilers!]]Despite being impossible to lose, Nyx doesn't qualify as ClippedWingAngel, due to only being ''survivable'' at all thanks to ThePowerOfFriendship. Nyx hits the damage cap ''every turn''.[[/labelnote]]
332** ''VideoGame/Persona4'' '''loves''' this trope. The first time is just before the fight with [[spoiler:Namatame, who is possessed by Kunino-sagiri and turns into him]]. Then, the real killer does it, transforming into [[spoiler:Ameno-sagiri, God Of Fog]]. On top of that, everyone's Shadow does this. There are eight major Shadows... so ''Persona 4'' does this ''ten times'' in total.
333*** And if you're playing ''Persona 4 Golden'', the TrueFinalBoss [[spoiler:Izanami]] does it ''twice'', first becoming her Goddess form, and then turning into [[spoiler:Izanami-no-Okami when you use the Orb of Sight]].
334** ''VideoGame/Persona5'' continues the trend, as almost every human's Shadow you face transforms in order to fight you[[note]]Exceptions are [[TheUnfought Shadow Futaba, Shadow Mishima]], and [[FlunkyBoss Shadow Okumura]][[/note]]. Lesser antagonists' Shadows in Mementos turn into Persona spirits, while Palace owners' Shadows become personalized monsters. The [[spoiler:Holy Grail]] also does this, changing from [[spoiler:a giant, golden goblet to Yaldabaoth, a massive AngelicAbomination]].
335** ''Videogame/Persona5Strikers'' follows similar story beats to its predecessor, so most of the bosses transform before fighting the Thieves. The final boss goes from a box to two different {{Angelic Abomination}}s.
336* The ''VideoGame/PhantasyStar'' series has LOADS of these.
337** In ''VideoGame/PhantasyStarI'', the Saccubus turns out to be a projection of Dark Force.
338** ''VideoGame/PhantasyStarIV'' has the Profound Darkness. It starts out as a disgusting mass of mouths and eyes. After this, it gets more streamlined as it transforms into an insectoid monstrosity with less teeth and more spikes. Then finally, it assumes its true form as a gigantic, unclothed woman with spiky wing-like protrusions on her back; this final form possibly references PSII's Mother Brain.
339** ''VideoGame/PhantasyStarOnline'' has Vol Opt/Vol Opt Version 2, an insane computer with two forms; Dark Falz, which starts out as a strange three-legged THING, then turns into a floating spell-throwing machine, and then in the higher difficulties it turns into a much meaner floating thing with seriously unpleasant physical attacks and periodic invulnerability; and Olga Flow, who turns from an upside down six-legged warrior-thing into a two-legged warrior thing about the size of a large BUILDING.
340** C.A.R.D. Revolution has a double-barrelled final boss that turns from a girl with a sword-arm and monstrous chunks of mutated flesh that defines Body Horror into a thankfully less-messed-up creature vaguely reminiscent of a Delsaber.
341** ''VideoGame/PhantasyStarUniverse'' has a couple of versions of Magashi, and a double-barrelled Dark Falz with the added bonus of one of the coolest yet least feasible arenas of all time. Dark Falz reappears in Ambition of the Illuminus in a side mission.
342** ''VideoGame/PhantasyStarPortable'' has Helga, [[spoiler:Vivienne]], and Dark Falz AGAIN.
343** And finally ''VideoGame/PhantasyStarZero'' has [[spoiler:Mother Trinity, who turns out to have been hosting Dark Falz.]]
344* ''[[VideoGame/{{Pico}} Pico's School]]'': Main antagonist Cassandra unleashes her true form as [[AliensAreBastards a Penillian conqueror]] when Pico confronts her, a form he then delivers [[GroinAttack several hundred assault rifle rounds to the genitals of]].
345* ''VideoGame/PillarsOfDust'': The FinalBoss, [[spoiler:Almorigga, turns into a floating head with an exposed brain. This is because his previous weaker form made the heroes bleed enough that their blood can be used to undo the seal on his powers.]]
346* ''Franchise/{{Pokemon}}'':
347** In ''VideoGame/PokemonBlack2AndWhite2'', after Ghetsis fails to freeze the player alive, Kyurem absorbs N's Reshiram/Zekrom and becomes a flaming/electrified (depending on the version) man-eating [[AnIcePerson ice]] dragon. However, you fight it first before tackling Ghetsis.
348** Introduced in ''VideoGame/PokemonXAndY'', [[SuperMode Mega Evolution]] allows certain Pokémon to gain a boost in most of their base stats[[note]]100 to the base stat total[[/note]] and, in most cases, a new ability. Sometimes, it will even change the user's type; for example, [[ShockAndAwe Ampharos]] becomes part [[OurDragonsAreDifferent Dragon-type]]. While there is never anything in the storyline to indicate that using Mega Evolution is considered a last resort, it seems to be treated as such in gameplay as AI trainers who have access to it will always save their Mega Pokémon for last during battles, sending it out only AFTER everything else on their team has been KO'd. [[spoiler:[[VideoGame/PokemonXAndY Team Flare Boss Lysandre and Champion Diantha]] use a Mega [[UnstoppableRage Gyarados]] and [[TheFairFolk Gardevoir]], respectively.]]
349** In ''VideoGame/PokemonSunAndMoon'', [[spoiler:Lusamine]] performs a FusionDance with [[EldritchAbomination a Nihilego]]. However, you don't actually fight the result directly; instead [[spoiler:it's a [[DuelsDecideEverything normal Trainer battle]], only Lusamine's Pokémon [[StatusBuff are all buffed with Totem Power]]]].
350** The climax of ''VideoGame/PokemonUltraSunAndUltraMoon'' has [[spoiler:Necrozma achieve its true form; Ultra Necrozma, a giant dragon made of golden light, complete with an exclusive Z-Move. And unlike Lusamine, you ''do'' fight it directly, [[StatusBuff complete with a stat-boosting Totem aura]] to make things harder]].
351** Wishiwashi is a weak fish, but if it's at level 20 or higher, it joins a whole school to become a much larger and more dangerous creature (which [[AlwaysABiggerFish even terrifies Gyarados]]). If its HP gets low enough, though, the school dissipates, leaving behind the original small fry.
352** The {{Olympus Mon|s}} Zygarde can do this mid-battle; if its HP drops below 50% and it has the Power Construct Ability, it will transform into its Complete Forme, with a small boost to most of its stats and a ''giant'' boost to its HP, [[DamageSpongeBoss making it even harder to take down]].
353** In ''VideoGame/PokemonSwordAndShield'', [[spoiler:[[OlympusMons Eternatus]] is fought in [[SequentialBoss three stages]]. For the second and third stages, it goes into it's Eternamax form, which is not only more powerful than [[MakeMyMonsterGrow Dynamaxing]] or [[SuperMode Gigantamaxing]], but ''has the highest base stats of any Pokémon in the entire franchise''. It even stops the PlayerCharacter and [[TheRival Hop]] from attacking it at all in the second stage. They only manage to defeat it in the third stage because [[BigGood Zacian and Zamazenta]] [[BigDamnHeroes came to help them]].]]
354** In ''VideoGame/PokemonLegendsArceus'', [[spoiler: your first encounter with [[SatanicArchetype Giratina]] requires you to defeat it in its Altered Forme, upon which it immediately switches into its Origin Forme and returns to full health.]]
355* [=GLaDOS=] from ''VideoGame/{{Portal}}'', [[spoiler:although it's more of an inversion, with Forms of Morality, Anger, Curiosity, and Cake being lost]].
356* ''VideoGame/{{Primal}}'' has a main character who can turn into different monster forms.
357* Alarune, the final boss of ''VideoGame/PN03'', transforms from a giant robotic skull to a {{beam spam}}ming [[SpiderTank scorpion tank]]. Prior to that, the second version of Orchidee reforms into a SpiderTank after you destroy its initial centipede form, and Loewenzahn II turns into a [[ThePhoenix robo-phoenix]].
358* The final boss of [[http://www.newgrounds.com/portal/view/495903 Press Space To Win Adventure Action RPG]] shouts "Now, face my true power!" before changing color and gaining 999999999 health points.
359* In ''VideoGame/Rayman3HoodlumHavoc'', a defeated Reflux the Knaaren teams up with BigBad André and steals his people's sacred scepter, the Scepter of the Leptys, becoming the FinalBoss. The thing empowers him differently than when he first faced Rayman ([[ShockAndAwe lightning-based]] powers mostly) and when that's not enough, he embeds the stone of the scepter in his back and [[AttackOfThe50FootWhatever grows more monstrous and gigantic]]. Rayman fights this form of him until the end.
360* The final boss in ''VideoGame/Ready2RumbleBoxing: Round 2'' is a hulked-out version of Michael Buffer.
361* [[SorcerousOverlord Scion]], the final boss of ''VideoGame/RedEarth'', has to be downed twice. After the first time, he mutates into a more horrific form that [[MyBrainIsBig exposes his brain]], and gets more powerful attacks.
362* ''Franchise/ResidentEvil'' frequently uses this trope:
363** In ''VideoGame/ResidentEvil2'', [[RecurringBoss William]] [[ImplacableMan Birkin]] initially appears as a somewhat mutated man and keeps reappearing in progressively less human forms until by the end, he has [[ClippedWingAngel degenerated]] into a mass of teeth, flesh, and [[CombatTentacles tentacles]]. Mr. X initially appears as a large humanoid in a trenchcoat, but grows a pair of massive claws by the end of the game.
364** In ''VideoGame/ResidentEvil3Nemesis'', Nemesis first appears as a bazooka-wielding Mr. X-like humanoid, then sheds his BadAssLongCoat revealing his CombatTentacles, then finally resembles a giant squid with legs.
365** In ''VideoGame/ResidentEvilCodeVeronica'', Alexia Ashford appears as an ordinary human at first, but mutates into a hideous queen ant/human hybrid and then a dragonfly-winged thing by the end.
366** In ''VideoGame/ResidentEvil0'' [[spoiler:Dr. Marcus]] becomes a huge mass of leeches just before fighting the characters.
367** In ''VideoGame/ResidentEvil4'', Mendez, Salazar, and Saddler all have hideous final forms. To make things rather more disturbing, they all seem to be in complete control of their mutations, unlike bosses in the previous games. Downplayed with Krauser, whose final form only changes his left arm, mutating into a bloodstained claw.
368** ''VideoGame/ResidentEvil5'' continues the tradition in grand style. After [[spoiler:his plans fail and the heroes are trapped in a volcano with him, Wesker hops himself up on Uroboros; while the mutation isn't as drastic as most ''RE'' examples, it still leaves him with giant tendrils in place of arms and glowing weak spots]]. There's also Ricardo Irving, who injects a mutagen given to him by Excella and turns into a hideous sea-dwelling, multi-tentacled monster, complete with {{Narm}}tacular LampshadeHanging:
369--->''I just had an '''extreme''' MAKEOV-AH!!''
370** Also in the fifth game, [[FanDisservice Excella herself]] becomes TheWormThatWalks, similar to Marcus.
371** Every final boss in ''VideoGame/ResidentEvilTheDarksideChronicles''.
372** In ''VideoGame/ResidentEvilTheUmbrellaChronicles'', there was Sergei Vladimir, who went from a scary and intimidating RenegadeRussian to a horrific-looking Tyrant after losing control of the T-Virus.
373** Special mention has to go to Morpheus Duvall of ''[[VideoGame/ResidentEvilGunSurvivor Resident Evil Dead Aim]]''. A Sephiroth pretty boy who is obsessed with beauty turns himself into a transgender [[ShockAndAwe electrical]] Tyrant, and then mutates into an absolutely enormous green blob with large claws, rib cage halves sticking out of its back, and a malformed head popping in and out of its torso as it drags itself along at a lumbering pace.
374** ''VideoGame/ResidentEvil6''[='s=] antagonists both become this. Derek Simmons becomes a barely humanoid jigsaw of flesh capable of morphing into one of several forms; in the final confrontation, he takes on the form of an insectoid creature. Meanwhile, [[spoiler:the other Ada/Carla Radames]] turns into a massive white blob of goo that overtakes the ship she oozed over, both the exterior and interior. The fight is spent in the interior having to avoid the goo-slathered walls which spawn either limbs trying to grab and absorb you, duplicates of her humanoid slime form, and explosive forms. The only way to combat her was the use of nitrogen.
375** ''VideoGame/ResidentEvil7Biohazard'''s Evelyn becomes a betentacled {{kaiju}}-sized EldritchAbomination for the final battle.
376* ''VideoGame/RiseOfTheKasai'' features four bosses (two are fought at the same time) who transform before the battle even begins because... who can blame them? The heroes just infiltrated their impenatrable fortresses and slaughtered their mook armies. Three transform into dragons, and the final one [[spoiler:transforms into a hideous spider-like monster with the animated corpses of its mooks fused to its legs]] still lashing out at the heroes.
377* In ''VideoGame/{{Rosenkreuzstilette}}'', Graf Michael Sepperin assumes his demon form once he TurnsRed. Also, in the final battle, [[spoiler:Iris' One-Winged Angel form is that of her own humble self with three pairs of golden seraph wings]]. In ''Rosenkreuzstilette Freudenstachel'', [[spoiler:Eifer]] becomes this, but in two separate fights.
378* ''VideoGame/SacredEarthAlternative'': All of Konoe's friends transform into boss monsters.
379** Wynne transforms into the Envoy of the Beginning, a minotaur.
380** Ryuna transforms into the Envoy of the Present, a black dragon.
381** Kell transforms into the Envoy of the End, a more ethereal looking version of her original beastkin form.
382* ''VideoGame/SakuraWars'':
383** At the end of ''VideoGame/SakuraWars1996'', [[spoiler:Ayame transforms into the demonic FallenAngel Aya-me thanks to the demon seed planted inside of her. Later on, Aoi Satan transforms into a more demonic version of himself, named Satan]].
384** In chapter 6 of ''VideoGame/SakuraWars2019'', [[spoiler:President G uses the Amamiya Kunisada, which is the Imperial Key, to change into his true form: a gigantic demon named Sotetsu Genan]].
385* Subverted in the ''VideoGame/SamAndMaxBeyondTimeAndSpace'' episode "What's New Beelzebub?" with [[spoiler:The Soda Poppers]]. Their "demon forms" are just different outfits, two of which differed only in color.
386* ''VideoGame/ScottPilgrimVsTheWorldTheGame'':
387** The game parodies this in Gideon's first boss fight. His main mode of attacking is transforming into a statue of an actual One-Winged Angel.
388** The first form of Gideon you face is Super Gideon, which is by itself a hulking, brutish form of him. Then he [[spoiler:transforms into the aberration known as Gigadeon, which is a bona-fide OneWingedAngel and references [[VideoGame/FinalFantasyVI Kefka Palazzo]]'s boss fight (see above). Subverted as the real final battle involves fighting a human-sized, robotic lookalike of Gideon wielding a pixelated katana. Immediately after the robot is defeated, the real Gideon just begs for mercy before being taken out with one hit]].
389* ''VideoGame/{{Shatterline}}'' have it's FinalBoss, Alan Seer, who absorbs the remaining powers of the Crystalline - turning himself into a half-silicon, half-human monstrosity to fight you.
390* The ''VideoGame/ShadowHearts'' series does this a lot. In the first game, ''every'' human boss enemy transformed into a monster of some sort to fight you. Largely due to powers of [[TheVirus Malice]] or a [[DealWithTheDevil pact]]. Or both.
391* ''VideoGame/ShiningTheHolyArk'': Panzer absorbs some of the evil from the Holy Ark to turn into a monstrous final boss -- an interesting variation in that Panzer is actually TheDragon.
392* In ''VideoGame/ShinMegamiTenseiIIINocturne'', Kagutsuchi starts off as... well, as one person described it, a giant disco ball. His second phase is a giant face... that spends the rest of the fight firing off a super-powerful almighty spell every other turn. There's also Chiaki, who, upon rejecting the last scraps of her humanity and becoming Baal Avatar, becomes a ''literal'' One-Winged Angel. The other Reason bosses might also count upon their respective ascensions.
393* ''VideoGame/ShinMegamiTenseiII'' gives us two examples in the Law and Chaos representatives. [[spoiler:Zayin and Louis Cypher are human looking enough, but when the former fuses with Seth to become Satan and the latter reveals his angelic form as Lucifer, they qualify as demons. Then you actually fight them, and they turn into horrific monstrosities - Satan is a giant purple beast with six breasts while Lucifer is a demonic seraphim.]] Averted with the FinalBoss, who only takes one form.
394* ''VideoGame/ShinMegamiTenseiIVApocalypse'':
395** [[spoiler:Upon his revival, Maitreya is transformed into the stronger Mitra-Buddha, who is fought shortly after.]]
396** [[spoiler:The last boss of the penultimate dungeon is Vishnu-Flynn, a fusion of an empowered Krishna and Flynn.]]
397** [[spoiler:YHVH is introduced as a giant head again. Beat him, and he turns into a giant black and purple demon.]]
398* In ''VideoGame/ShinMegamiTenseiIV'', both [[spoiler:Merkabah and Lucifer have one of these]], which is pretty impressive as neither of them were that pretty in the first place.
399* ''VideoGame/ShinMegamiTenseiStrangeJourney'':
400** Mem Aleph, the [[MultipleEndings Normal and Law path]] final boss, turns into a fetal being in a technicolor force field after you defeat her normal-looking form. This trick has been pulled in other games, notably ''VideoGame/{{Okami}}'', but Mem Aleph's "empty" form makes up for it by being one of the hardest RPG bosses in existence.
401** The first four bosses come back in bigger, more powerful shapes in Fornax (their power is fully unhindered there); [[BloodKnight Morax]] evolves into Moloch, [[MadScientist Mitra]] evolves into Mithras, [[BigEater Horkos]] evolves into Orcus, and [[SocialDarwinist Asura]] evolves into Asherah. Jimenez and Zelenin also enter their respective OneWingedAngel shapes as Awake and Soil Forms for Jimenez and Judge and Pillar Forms for Zelenin.
402* ''VideoGame/ShovelKnight'': The Enchantress is able to maintain her human form [[spoiler:by possessing the body of Shield Knight]] as long as the amulet that holds her powers is intact. When the amulet is destroyed [[spoiler:and Shield Knight is freed from its influence]], her magic goes haywire and coalesces into a mindless force of destruction known as the Remnant of Fate.
403* In ''VideoGame/SilentHill2'', Maria transforms into a gray-skinned tentacled levitating upside-down-in-a-cage abomination for the final battle.
404* Armon Ritter of ''VideoGame/SinAndPunishmentStarSuccessor'' has based most of his ''fighting style'' around this. He has three One-Winged Angel forms: The first is an enormous bat-looking protozoa capable of summoning missiles, floating balls of goop that attack you at both long and close range, and ''fighter jets''. His second is an [[AttackOfThe50FootWhatever giant insectile seahorse]] that can box you in and play a game of deadly pong in that energy box with you in it. And his final (and hardest) form? Five killer whales. [[SarcasmMode Scareeee.]] At least all of his forms have a Godzilla/Mothra-esque scream that accompanies every charge shot you throw at him. Later on, it turns out that every single one of the Nebulox has a One Winged Angel form, as well as [[spoiler:you]]. This makes for one of the most entertaining levels in the game, along with one of the most challenging bosses.
405* ''VideoGame/SkiesOfArcadia'': [[spoiler:First you fight Ramirez, then he sacrifices his life to control Zelos, the Silver Gigas, and then he crosses the BishonenLine.]] Interesting in that the boss's original form is perfectly visible inside his translucent OneWingedAngel form.
406* In ''VideoGame/{{Skylanders}}'', you can count on the series' BigBad Kaos to provide examples.
407** In ''VideoGame/SkylandersSwapForce'', he gets buried under a pile of the petrified darkness and gets powered by them, growing into a giant with the ability to [[ShockwaveStomp create shockwaves by stomping]] and [[PlayingWithFire shoot fire out of his hands]].
408** In ''VideoGame/SkylandersTrapTeam'', he infuses himself with the power of Traptanium turns into a crystal hybrid who attacks with Traptanium swords and black magic auras, can heal himself, and can even see the Portal Master on Earth all the way from Skylands.
409** In ''VideoGame/SkylandersImaginators'', he gets Brain to power him up with the best of Mind Magic, and gets turned into [[Anime/DragonBallZ Super Kaos]], who can summon his Doomlanders from throughout the game to aid him in the battle.
410* In ''VideoGame/Sly2BandOfThieves'', Arpeggio attempts to hijack the resembled body of Clockwerk to become immortal... and to finally fly. However, [[spoiler:Neyla betrays him and takes the body for herself, becoming Clock-La, and serving as the final boss]]. Considering that Clockwerk is [[ThePowerOfHate powered by hatred]], and [[spoiler:Neyla's]] heart is deathly black, it's fitting.
411* The arcade game ''VideoGame/SmashTV'' features a difficult boss named Scarface: an enormous green, well, ''face'' who spits swarms of bullets and ricocheting mines at you. You'll spend five to ten minutes (and about that many lives) grossly disfiguring him with ammunition until he finally dies and explodes, only for [[spoiler:his skull to scream "NO WAY!" and blast you with death beams from his eye sockets]].
412* In ''VideoGame/{{Solatorobo}}'', when you come to finally fight against Bruno, who up until then had been a regular-looking Caninu, he's been transformed into a hulking monster [[spoiler:by Lares]]. Although Bruno does state that it's his true form, it's debatable whether this is true, or if [[spoiler:Lares]] is simply using him as a puppet.
413* Following ''VideoGame/SonicAdventure'', the ''Franchise/SonicTheHedgehog'' series frequently uses this trope almost as much as Square-Enix does. For instance:
414** The original ''VideoGame/SonicAdventure'' has Chaos Zero, who actually has ''seven'' different transformations, one for each Chaos Emerald he absorbs[[note]]He never transforms into Chaos 3 or Chaos 5, as he was given two Emeralds at once as Chaos 2 and 4, respectively, and while Chaos 1 is seen in a cutscene, it's TheUnfought[[/note]]. After absorbing all the Emeralds, he transforms from a water elemental-like mutated chao into a watery leviathan powerful enough to destroy entire airships in one blast.
415** In [[AstralFinale 4th Dimension Space]], the fifth and final board of ''VideoGame/SonicShuffle'', [[BigBad Void]] returns to the Temple of Light so he can become whole. Lumina leads Sonic and his friends after him to prevent him from smashing the Precioustone that they spent the whole game collecting pieces of. Once they find Void in the temple and Lumina tells him to stop, Void gets upset and transforms into a giant monster. The final mini-game, "Void Battle" involves Sonic and his friends jumping on the light switches to restore the temple while avoiding Void's attacks, which include smashing the ground to create shockwaves, zapping one player, and stomping players. Once the switches are hit sixteen times, they will activate the master switch in the center of the temple to defeat Void.
416** In ''VideoGame/SonicAdventure2'', there's the Biolizard, [[SuperPrototype the prototype of the Ultimate Lifeform]]. After it was initially defeated by Shadow, its successor, it uses Chaos Control to warp right out of the room and binds itself to the Space Colony ARK [[note]]a giant space station housing, among other things, a weapon capable of destroying a planet[[/note]] and begins a crash course for Earth.
417** ''VideoGame/SonicHeroes'' has this happen to Metal Sonic, who, after spending most of his time in the shadows, transforms into a titanic metal dragon called Metal Madness, armed with the power of the aforementioned Chaos, as well as that of Team Sonic and Shadow. Three-quarters into the battle, he sprouts huge metal wings, further transforming into the Metal Overlord. Metal Sonic goes through a similar and even more threatening-looking transformation at the end of ''VideoGame/KnucklesChaotix'', nicknamed Metal Sonic Kai by fans. A similar transformation to the latter form also occurs when Metal uses the Phantom Ruby in ''VideoGame/SonicMania''.
418** Following a botched attempt to mind-control the main protagonist, Black Doom, the main BigBad of ''VideoGame/ShadowTheHedgehog'', transforms into Devil Doom, which was a giant 2-headed dragon-like alien that melded itself into the Black Comet.
419** The handheld title ''VideoGame/SonicAdvance3'' has Gemerl. Following the initial final battle with him and Eggman, he swipes the Chaos Emeralds from Sonic, akin to ''[[VideoGame/Sonic3AndKnuckles Sonic The Hedgehog 3]]'''s intro cutscene, and uses them to transform into a berserk orb-like machine with laser-firing claws.
420** The main antagonist of ''VideoGame/SonicAndTheSecretRings'', the Erazor Djinn, suffers a surprisingly ''unintentional'' version of this, turning into an ugly "incomplete monster" called Alf Layla wa-Layla after absorbing the [[GreenRocks World Rings]] following [[TakingTheBullet a botched sacrifice.]]
421** In ''VideoGame/SonicAndTheBlackKnight'', there's [[spoiler:Merlina]], the Dark Queen. Throughout the course of the game, she goes from a harmless cute wizard to a scary evil sorceress to a giant armored knight with four arms, two of which are armed with building-sized swords.
422** Dark Gaia in ''VideoGame/SonicUnleashed'' goes through two transformations, first absorbing the energy Sonic inadvertently stole at the start of the game to become the Werehog and opening three giant green eyes on its head. The second transformation, which it activates after fully maturing, has it grow two more pairs of arms (that rip out of its body with AlienBlood) and open the seven giant eyes that are contained ''inside of its giant mouth''.
423* ''VideoGame/SoulSeries'':
424** In the first game, ''Soul Edge'', after defeating BigBad Cervantes de Leon, a cutscene shows how his body is burnt by hellfire to become "[=SoulEdge=]", a souped-up Cervantes with a [[IncendiaryExponent body of fire]] and a skull for a face.
425** ''Soulcalibur III'' features two. The first is the regular FinalBoss Abyss, a corrupted form of [[MagnificentBastard Zasalamel]] after being infused by a large amount of energy from the Soul swords. This turns him into a rotten, zombie-like EldritchAbomination with two rows of teeth and a horned skull-like head with PsychicPowers.
426** The second is Night Terror, the TrueFinalBoss only accessed by taking the correct path in the story mode, and represents a form taken by Nightmare after absorbing the power of Soul Edge and Soul Calibur into itself, offscreen. This transforms the azure knight into a flesh-colored, bigger, and more savage form with two large, fiery-feathered wings on its back (which allow him to fly back up if [[RingOut knocked off the stage]]). Nightmare also pulls this off [[spoiler:at the end of his story, turning into Night Terror with an input from the player]].
427* Parodied hard in the Sega CD adaptation of ''Manga/SpaceAdventureCobra''. When a rather fragile sentient plant is confronted, it proceeds to laugh mockingly at Cobra before turning into a gigantic demon. Its speech is cut short at "My name is..." when Cobra blasts it, splattering it all over the room. Afterwards he notes, "Next time I'll just whack it upside the head with a newspaper."
428* Purge from ''VideoGame/SpaceChannel5 Part 2'' doesn't transform into a One Winged Angel, but rather he MAKES it himself. He places his human body into a Giant P, and allows himself to become Purge the Great: [[http://i51.tinypic.com/6899i9.jpg A giant holographic being with blue gloves and goggles.]] He then [[NintendoHard starts firing electric shots at you, and you have to dodge them to survive.]] All to incredibly awesome music.
429* ''[[VideoGame/RocketKnightAdventures Sparkster: Rocket Knight Adventures 2]]'': Once Sparkster defeats [[BigBad King Gedol]] in his normal form, the second phase of the battle (which is skipped on the easiest difficulty) involves Gedol growing to an enormous size and shooting lasers from his eyes. Sparkster has to attack the jewel in the center of his head to damage him.
430* In ''VideoGame/SpiderMan2000'', Doctor Octopus finds himself bonding with the Carnage symbiote, becoming the deadly Monster-Ock. Between it and Ock's base exploding, Spidey decides the best thing to do is turn and run. Doing anything short of running ''away'' from it leads to a game over and you have to start the run again.
431* In ''VideoGame/SpiralKnights'', Lord Vanaduke does a variation of this. Although he starts out already big and monstrous, he takes the trope up to eleven in his final form. Upon significant damage, he will lose his mask and reveal his shadowed face, commencing the transformation. Fire and lava burst from cracks in his armor, he begins to glow as if possessed, and orbs of cursed flame spin around him, forming a halo as if he has become a god. In addition, he is surrounded by corrupted [[FlunkyBoss Slag Guards]]. The [[IAmNotShazam Jelly King/Royal Jelly]] does this as well, except he loses his crown to become more powerful, rather than gaining it.
432* ''VideoGame/StarFox'':
433** The series does this surprisingly little, but at the end of ''VideoGame/StarFox64''[='=]s hard route, Andross transforms into a giant brain, giving the quip [[{{Pun}} "Only I have the Brains to rule Lylat".]]
434** Then there's Great Commander's second form from ''VideoGame/StarFox''[=/=]''Starwing''.
435** Phantron, which morphs into a jumping frog-like mecha for its second form, with a ScareChord during the transformation.
436** In the first game's Hard route, Andross morphs into a horned demon about halfway through the battle.
437* [[AGodAmI The Grandmaster]] from ''VideoGame/{{Strider}}'' averts this in the [[VideoGame/StriderArcade first two Arcade games]] in the series, but then turns to it in the [[VideoGame/Strider2014 2014 game]]. Upon being defeated by Hiryu, he transports himself into outer space and adopts his true form: a massively large EldritchAbomination of an alien with two serpent-like CognizantLimbs known as "Meio Prime".
438* ''VideoGame/{{Suikoden}}'': At the end of the first installment, the human antagonist transforms into a three-headed dragon.
439* ''Franchise/SuperMarioBros'':
440** [[BigBad Bowser's]] signature One-Winged Angel tactic in the ''VideoGame/YoshisIsland'' and ''VideoGame/NewSuperMarioBros'' series is [[AttackOfTheFiftyFootWhatever growing giant]].
441** In ''VideoGame/SuperMario3DWorld'', Bowser pulls off a different method of transforming for the final battle. Instead of merely growing to giant size, [[spoiler:he decides to take a page out of Mario's book and use a power-up on himself, absorbing the power of a Super Bell to become a [[CatsAreMean giant cat monster]] known as Meowser]].
442** ''VideoGame/MarioParty10'': In Bowser's Tank Terror, after Bowser is reduced to only half of his remaining health, his tank explodes and sends him flying into the surrounding lava pit, only for him to rise back up as a giant Dry Bowser for round two.
443** Bowser in the original ''VideoGame/{{Paper Mario|64}}'' super-sizes, and gains some cool blue flames on his shell, before the final fight with him.
444** ''VideoGame/PaperMarioTheThousandYearDoor'':
445*** [[spoiler:Grubba]] is ''already'' a monster, but a roughly-human-sized, comical one. Before you fight him, he turns into a much more menacing-looking giant creature.
446*** The final boss has two forms, starting off as [[spoiler:her form where she first possesses Peach]], then going into her [[spoiler:true form]].
447** ''VideoGame/SuperPaperMario'':
448*** Mimi is not the BigBad, but she transforms into a GiantSpider frequently. It's also really disturbing. Oddly enough, you don't battle her regular girl form until the second time you battle her.
449*** [[spoiler:Dimentio possesses Luigi]] and turns into [[spoiler:Super Dimentio]].
450** In ''VideoGame/PaperMarioStickerStar'', Bowser turns giant again, only this time he's made of cardboard.
451** In ''VideoGame/PaperMarioTheOrigamiKing'', the titular villain King Olly takes on different monster forms across all three phases of his battle. [[spoiler:In the first phase, he uses his own Magic Circles to transform into one of the four [[ElementalEmbodiment Vellumentals]]. His sister, Olivia, needs to assume these forms herself to counter his attacks. With the second phase, he folds himself into a giant paper sumo. Olivia uses the same transformation on Bowser (subsequently being a rare ''heroic'' instance of this trope for the Koopa King) to fight Olly on equal footing. Finally, Olly uses all his power and hatred to grow supersized, gaining his own Thousand-Fold Arms in the process.]]
452** ''VideoGame/MarioAndLuigiPartnersInTime'' features one with Princess Shroob, who turns into a [[CognizantLimbs multi-tentacled]] beast. [[spoiler:This is the older Princess Shroob]], and you don't learn that until after you beat [[spoiler:the first Princess Shroob]].
453** ''VideoGame/MarioAndLuigiBowsersInsideStory'':
454*** When Bowser fights [[TheDragon Midbus]] for [[RecurringBoss the final time]], Fawful uses his ray gun to transform him into [[AnIcePerson Blizzard Midbus]].
455*** The main antagonist, Fawful, transforms into Dark Fawful, and during Bowser's battle with [[spoiler:Dark Bowser]], the Mario Bros. fight Dark Fawful in a giant form with many limbs that must be attacked (similar to the previous two final bosses before him).
456** ''VideoGame/MarioAndLuigiDreamTeam'':
457*** The FinalBoss is [[spoiler:a larger, rainbow-colored Bowser called "Dreamy Bowser"]], powered up as a result of [[spoiler:swallowing the fragments of the shattered Dream Stone]].
458*** The game also features [[spoiler:Antasma]], who is first encountered as a dark fog cloud with eyes, then proceeds to turn into a [[spoiler:bat when teaming up with Bowser]], then in the overworld assumes a [[spoiler:vampire-like]] form while not using his second form for travelling, and finally, when he's fought [[spoiler:in the Dream World, takes on a much more powerful-looking variation of the latter]]. Somewhat subverted in that [[spoiler:his final form, albeit with only one attack and automatically going down after being attacked twice regardless of damage (which isn't even displayed for either side), is also fought as the game's tutorial battle]].
459** The final boss of ''VideoGame/MarioAndLuigiPaperJam'', [[spoiler:Shiny [=RoboBowser=], is not an example of this for the regular Bowser, who merely does his usual MakeMyMonsterGrow routine, but for Paper Bowser, who performs a FusionDance with a bunch of his paper minions to transform into a massive suit of cardboard PoweredArmor for his counterpart to wear]].
460** ''VideoGame/PrincessPeachShowtime'': Once Grape is defeated for the first time, she assumes a much bigger form named [[spoiler:Grape the Great]], who ended up destroying the entire Sparkle Theater, leaving it in rubbles.
461* ''VideoGame/SuperRobotWars'' has several, such as the R-Gun Rivale and Dark Brain.
462* ''VideoGame/SuperSmashBros'':
463** By beating the Adventure mode of ''VideoGame/SuperSmashBrosMelee'' on a hard enough setting, the last boss Bowser transforms into the giant beast that is ''Giga Bowser''.[[note]]Specifically, this requires completing Adventure Mode in normal or higher difficulty within 18 minutes without using any continues.[[/note]] ''Brawl'' actually has this as Bowser's Final Smash, Giga Bowser; Ganondorf gets a similar transformation, based off his ''Twilight Princess'' beast form. Mr. Game & Watch's Final Smash has him transform... into an octopus.
464** In the ''Subspace Emissary'' in ''VideoGame/SuperSmashBrosBrawl'', [[spoiler:Tabuu, the ManBehindTheMan (behind the other men)]], transforms into a winged version of himself that can [[spoiler:transform the heroes back into trophies]]. But then [[spoiler:Sonic the Hedgehog]] comes and damages both of his wings, thus weaking his power to just an instant KO.
465** In ''VideoGame/SuperSmashBrosForNintendo3DSAndWiiU'', Master Hand gets his own One-Winged Angel form: Master Core. Triggered when he takes enough damage on higher difficulties (5.0 and up) in Classic Mode. Depending on the difficulty, Master Core comes in a total of four forms to fight. [[HumanoidAbomination Master Giant]], [[MixAndMatchCritters Master Beast]], [[StormOfBlades Master Sabres]], and [[EvilKnockoff Master Shadow]]. Once all forms are defeated, Master Core will be reduced to a simple [[ClippedWingAngel Smash Ball]] that the player needs to knock off the stage fast, otherwise it will send a [[OneHitKill series of shockwaves that will instant KO the player]]. Master Core can only fire five of these before [[PhlebotinumBreakdown it self-destructs]]. The ''Wii U'' version takes it up to eleven with an additional form called [[LevelInBossClothing Master Fortress]], which manifests if the current difficulty is within the 8.0 - 9.0 interval.
466** ''VideoGame/SuperSmashBrosUltimate'' includes [[Franchise/{{Castlevania}} Dracula]] as a boss, who will assume his true form from ''Symphony of the Night'' after you beat him for the first time; and introduces as DLC the TropeNamer himself, [[VideoGame/FinalFantasyVII Sephiroth]]. Not only can he sprout his eponymous one wing from ''Advent Children'', but he also turns into Safer Sephiroth as part of his Final Smash.
467* ''VideoGame/SweetHome1989'': Lady Mamiya turns from a regular-looking ghost of an old woman to a horrific blue-skinned monster with the right side of her face burnt, spindly arms, and lots of tumor-like bumps (which are actually faces of children who she burned alive) covering her and forming a massive hunchback in the final battle.
468* ''VideoGame/TalesOfPhantasia'' has Dhaos, who is first fought in his human form, then reveals his "True Power", a giant monster vaguely reminiscent of a giant armored purple-and-red Praying Mantis, then crosses the BishonenLine by invoking his gods and turning into an angelic-like being -- much like Yggdrasil from the later ''VideoGame/TalesOfSymphonia''. In the original SNES version, however, he only has the first two forms.
469** Kronos/Miktran from ''VideoGame/TalesOfDestiny'' turns into an EldritchAbomination after being defeated once in the original game, but takes on a form resembling a purple demon in the remake.
470** ''VideoGame/TalesOfSymphonia'':
471*** The aforementioned Yggdrasil transforms from an AdorablyPrecociousChild into some odd mechanical form in his boss battle. Unfortunately for him, [[ClippedWingAngel the angel form is much easier than his first form]].
472*** Earlier in the game, Rodyle is confronted by the protagonists, who have learned he's been using a farming method even crueler than the one used for making normal Ex Spheres, to create specialized stones called Cruxis Crystals, which transform people into [[OurAngelsAreDifferent angels]]. When he's cornered and left no option but to fight, he equips what he believes to be a Cruxis Crystal, intending to become an angel and put the smack down on the heroes. It turns out his "Cruxis Crystal" is an ordinary Ex Sphere that hasn't been equipped with a proper seal, making him pull this trope instead.
473** The final boss of the main story of ''VideoGame/TalesOfLegendia'' starts off looking human, but transforms after he absorbs the power of the Nerifes and becomes its physical avatar, which looks like a blueish humanoid robot.
474** Mathias from ''VideoGame/TalesOfInnocence'' ditches her human form immediately, changing into a freakish centaur-like form that has her torso situated on the body of Asura in place of his head. In the remake, she additionally takes on a human form after that, then becomes a near-perfect copy of Asura for her final form.
475** In ''VideoGame/TalesOfVesperia'', [[spoiler:Duke]] starts off looking perfectly human, then changes into an ethereal form with a ton of AttackDrones floating around him. If you collected all of the Fell Arms, he'll change into a third form, which is similar to the second, but with dark skin and [[ShirtlessScene no shirt]].
476** Downplayed by [[spoiler:Van]] in ''VideoGame/TalesOfTheAbyss'' and [[spoiler:Gaius]] in ''VideoGame/TalesOfXillia'', whose FinalBoss power-ups are marked by little more than a costume change. It's still played straight with [[spoiler:Mohs]] in ''Abyss''.
477** [[spoiler:Bisley]] in ''VideoGame/TalesOfXillia2'' chooses to activate his [[spoiler:Chromatus]] for the final battle, which manifests as a suit of black and red armor with [[PowerGivesYouWings black wings]].
478** In ''VideoGame/TalesOfBerseria'', after beating both [[BigBad Artorius]] and [[spoiler:Innominat]] in the first phase of the final fight, Artorius fuses with the latter. He becomes much taller, his hair comes loose, starts to [[PowerFloats float]], and his sword turns into a massive OneHandedZweihander.
479* In most every ''Franchise/TeenageMutantNinjaTurtles'' game that came out after ''[[Film/TeenageMutantNinjaTurtlesIITheSecretOfTheOoze Secret of the Ooze]]'', Shredder would turn into Super Shredder. In the SNES version of ''[[VideoGame/TeenageMutantNinjaTurtlesTurtlesInTime Turtles in Time]]'' he would do this without you even fighting him as normal Shredder.
480* The ''VideoGame/{{Tekken}}'' series has such boss characters as Ogre's transformed state True Ogre (which resembles Beast from ''Disney's Beauty And The Beast'', but with a snake for a left arm). In 'The Devil Within' subgame from ''Tekken 5'', Ogre goes through even more transforming states. While you don't fight them always (never Jinpachi, sometimes Jin) in their normal forms prior to their transformed forms, Devil Jin and Jinpachi from ''Tekken 5'' are transformed characters. They are for most characters the second-to-last and final bosses. In both cases, they are infected with the Devil Gene, so if the Devil Gene is seen as the enemy, it is incarnating within two separate people. If Devil Jin defeats Jinpachi, he absorbs his power and transforms further, though he is not someone who can be played as or fought.
481* Used in an interesting way in ''VideoGame/TempleOfElementalEvil''. Towards the end of the game, your party can encounter a human adventurer deep inside one of the Elemental Planes. She explains that she came down there with her party, but they were killed and she barely escaped. She asks to go with you, and if allowed, you'll find she's a decent-ish sorceress. But if, in dialogue, your characters detect something amiss, they can confront her about it. At this point, she reveals that she's actually a half-succubus, and wants to come along with the party because she's ''bored.'' If you let her, she'll drop the pretense and switch back into her true form, making her a much more powerful companion.
482* The FinalBoss in ''VideoGame/{{Tenchu}}: Wrath of Heaven'' takes on different OneWingedAngel forms depending on the character chosen: when facing Rikimaru, Tenrai will summon previous BigBad Lord Mei-Oh's power to empower himself into a darkness-based magical form; when facing Ayame, he will instead use the powers of the MacGuffin to transform into a snake-like form with [[PoisonousPerson poisonous powers]].
483* Happens to the ''T-1000'' at the end of the SNES version of ''Film/Terminator2JudgmentDay''. After a RingOutBoss fight where you shoot it to knock it into the steel vat like in the movie, the T-1000 emerges from the vat as a giant man-shaped blob that spits molten steel at you.
484* ''VideoGame/TerminatorRampage'' ends with your confrontation with the latest Skynet AI, Meta-Node, who assimilates the machines in the base to become a gigantic, hovering robotic monster to fight you as a boss.
485* Most bosses from ''VideoGame/{{Terraria}}'' go through this. An early example is the Eye of Cthulhu, which changes from "slow laser projectiles" to "fast ramming" about halfway through the fight.
486* In ''[[VideoGame/TimeCrisis Time Crisis 5]]'', [[spoiler:Robert Baxter's HumongousMecha undergoes this in the final battle]].
487* In ''VideoGame/TomatoAdventure'', King Avira becomes Abiwrath, a powerful robotic being with pacifier cannons after merging with the headless robot. [[spoiler: This is the result of the robot merging with its now different head.]]
488* Several bosses in the ''Franchise/TombRaider'' series:
489** In ''VideoGame/TombRaiderII'', Bartoli turns into a dragon.
490** In ''VideoGame/TombRaiderIII'', Dr. Willard is mutated into a grotesque human/spider hybrid creature.
491** In ''[[VideoGame/TombRaiderTheAngelOfDarkness The Angel of Darkness]]'', Boaz is shoved into a pod of some sort and mutated into a giant [[ThatOneBoss slime-spitting cockroach-like creature]] (then turns into a skeletal ClippedWingAngel).
492** Honourary mention goes to Natla from the [[VideoGame/TombRaiderI original game]], who fixes herself up as a two-winged version for the final showdown.
493* A variation, in that it's not exactly a transformation and does not instantly follow the first battle: one PC-98 ''Franchise/TouhouProject'' game features an early boss that fights you using a flower-themed tank. She returns in the game's extra stage with a ''much'' more intimidating EldritchAbomination-looking tank consisting of a humongous eye with bat wings, tentacles and an angelic halo. [[ThatOneBoss This form is widely considered as the hardest extra stage boss in the series.]]
494** The same game (which happens to be ''VideoGame/TouhouFuumarokuTheStoryOfEasternWonderland'') has a similar concept with the final boss, [[EvilSorceress Mima,]] but only if you beat the game [[NintendoHard without using any continues]]. She says she wasn't trying before and now she's serious. [[SchizophrenicDifficulty Oddly enough, she dies a lot faster in this form than in her normal form.]]
495** In ''VideoGame/TouhouYouyoumuPerfectCherryBlossom'', [[TheUndead Yuyuko]] turns into a completely invincible shadow of her being in the last stage of the FinalBattle. The music of this battle is appropriately named "Border of Life".
496** In the very first game, ''VideoGame/TouhouReiidenHighlyResponsiveToPrayers'', the final boss of the Makai route gets that kind of second form. [[SchizophrenicDifficulty It has a surprisingly low number of hit points compared to the first form, though.]]
497*** That said, if you don't know that Sariel has a final form, you are likely to have blown all your bombs defeating its first form -- and thus have no bombs, one life, and are fighting something with unknown attack patterns.
498** In ''VideoGame/TouhouHyouibanaAntinomyOfCommonFlowers'', Shion Yorigami, one half of the two main villains, turns into her Super Poverty God form after their [[LetsYouAndHimFight trump card]] was overcome, and fights Reimu [[DuelBoss alone]].
499* In ''[[VideoGame/TheLegendOfHeroesTrailsInTheSky Trails in the Sky SC]]'', at the climax of the story, [[BigBad Weissmann]] forcibly fuses with the [[PhysicalGod Aureole]] and becomes Angel Weissmann, a gigantic angelic monster which acts as the final boss of the game.
500* Nero Chaos in ''VisualNovel/{{Tsukihime}}'', when he finally realizes that he is getting his ass kicked but refuses to run away, eventually joins all the chaos left in his body into its ultimate destructive form, which isn't very well described except that it looks 'efficient.' The motion blurred picture given looks something like a [[VideoGame/WorldOfWarcraft worgen.]]
501* Even a vertical shoot'em'up with space fighters can have this. In the final level of ''VideoGame/{{Tyrian}}'', Vykromod, the alien assassin who's been stalking the player for some time, seems to turn into a giant floating face -- a pair of eyes, a nose, and a mouth.
502* Dr. Crayborn in ''VideoGame/UndercoverCops'' locks himself into one of his experimental machines and mutates into a giant monster for the FinalBoss battle.
503* ''VideoGame/{{Undertale}}'':
504** The final boss of the Neutral route is [[spoiler:Photoshop Flowey, a hideous monster form Flowey takes on after destroying King Asgore's soul and stealing the six human souls. In a world where bosses are usually depicted in monochrome, Photoshop Flowey is something akin to an EldritchAbomination, an uncanny mix of colorful photo-realistic sprites situated around a monitor depicting either Flowey's hideously-grinning SlasherSmile or photorealistic sprites of a shouting human face. He fights in all sorts of bizarre ways, including bullet hell patterns, tentacle-like vines, flame-throwers, finger guns, bombs, and twisted versions of previous weapons found in the game (like the Toy Knife and the Ballet Shoes)]] .
505** Then there's the final boss of the Pacifist Route. [[spoiler:Flowey steals the six human souls ''and'' the souls of nearly every monster in the underground, allowing him to return to his original form as Asriel Dreemur. Then he uses the power of the souls to become an aged-up, super-powered version of himself. And in the final stage of the battle, he goes one step further and becomes "The Absolute God of Hyperdeath", gaining ethereal wings and a more demonic appearance.]]
506** On the Genocide Route, [[spoiler:Undyne, after being seemingly struck down by the player, gets back up in a flash of light as Undyne the Undying, her one-winged form. In addition to being referred to in the start of her fight as "the heroine" and gaining new, spike-clad armor, her new forms' arrow attacks become much faster and deadlier than her usual set prevalent in the other routes, and she gains more spear-based attack patterns. Her new speed, patterns and attacks, as well as the circumstance of being the first actual boss battle of the Genocide route, make her harder to fight than Photoshop Flowey.]]
507* The normally body-less BigBad of ''VideoGame/AnUntitledStory'' takes a total of five forms[[note]]four on Simple[[/note]], starting from [[VideoGame/{{Jumper}} The Boss]] look-alike, a duo of flying rings, a walking mecha (and its head), and a disturbing pair of disturbing eyes.
508* Dii in ''VideoGame/{{Utawarerumono}}''; initially an actual [[WingedHumanoid angel-winged]] {{Bishonen}}, he transforms into something best described as a [[{{Notzilla}} black-armoured blue]] Franchise/{{Godzilla}}. [[spoiler:Hakuro does the same thing, only he has blue armor.]]
509* The final boss of ''VideoGame/VandalHearts 2'' has two OneWingedAngel forms; you fight his human form earlier in the game.
510* ''VideoGame/VikingBattleForAsgard'': Hel pulls one of these in your final fight with her.
511* Similarly, in ''VideoGame/WarcraftIII'', demon hunters like Illidan and mountain kings like Muradin can transform into bigger and monstrous version of themselves.
512* In ''VideoGame/{{Wardner}}'', the eponymous FinalBoss takes a few licks in his evil wizard form, then transforms into a giant brown demon and starts spitting out a continuous maze of descending fireballs.
513* In ''VideoGame/{{Warframe}}'', the Grinner councilor Vay Hek was once a relatively normal Grineer mook boss who happened to have some better equipment and abilities. However, once he seriously pissed off the [[PlayerCharacter Tenno]], he fled and began a regime of comprehensive combat augmentations. Now [[BrainInAJar little more than a head]] mounted on a flying platform, he's a far more dangerous. In his Assassination mission, once "defeated", he will laugh before calling down a HumongousMecha that his [[MetaMecha body hooks into]].
514* The Watcher grows wings to become this in ''VideoGame/HeartOfIce''. [[spoiler:In the hardcore fight with him, a [[LampshadeHanging literal example]] of this trope occurs.]]
515* Taken to an extreme in ''VideoGame/{{Wild ARMs 3}}'', in which the final boss has a whopping '''''ten''''' forms. The first ''[[VideoGame/WildArms1 Wild ARMs]]'' game has a few of these. Several bosses will take another form after their apparent defeat, only to return bigger and badder than ever (so they claim), such as Mother, Ziekfried, and Boomerang (after his final death, you can fight his resurrected form in the arena). Alhazad doesn't transform, but he has always worn a white cloak covering his body, and he finally takes it off to reveal his true form. But the best example in this game that fits the trope perfectly is Zed -- a bumbling wannabe boss who, in a side quest late in the game, finally loses his cool and turns into his true form, a huge grotesque monster, and becomes one of the toughest bosses in the game.
516* ''VideoGame/TheWorldIsYourWeapon'': The FinalBoss, [[spoiler:Ameno Ohbari]], has a second form once her first form is injured enough, which turns her lower body into a head with many hands. The first form cannot be captured and has no entry in the glossary, but the second form can be captured in a rematch.
517* ''VideoGame/WorldOfWarcraft'' has several bosses that transform during battles; Illidan Stormrage shifts into and out of his fully demonic Metamorphosis form (as opposed to his normal half-night elf, half demon form); similarily Leotheras the Blind shifts between being a Blood Elf and a Demon (until eventually splititng into two separate forms); similarily, several dragon bosses who start out in humanoid forms. Saidan Dathoran/Balnazaar and [[spoiler:Baeren Westwind/Mal'ganis]] revert to their true demon forms mindway through battle, being previously disguised as humans.
518** Demonology Warlocks can learn the "Demon form" talent that transforms them into a demon for a short period, buffing their armour and spellcasting. In its [[http://www.wowhead.com/spell=59672 later form]], it also grants defensive bonuses that often make it overlap with EmergencyTransformation.
519*** In the Legion expansion, Demonology Warlocks lose this ability, as it is returned to its original owners (see the notes about VideoGame/WarcraftIII below): Demon Hunters. Havoc-specced Demon Hunters transform into the traditional winged form, and Vengeance Demon Hunters transform into hulking armoured brutes, as is fitting for their role as tanks.
520** A few other bosses go through consecutive transformations throughout the fight. Thus, EldritchAbomination C'thun starts out as a giant eye, before turning into a huge bloated body with a lot of teeth and eyes. Even more prominent with Yogg'saron, whose first form is humanoid, and second form is... well... his title is "The Beast of a Thousand Maws" and it fits him to a T.
521** [[Film/MontyPythonAndTheHolyGrail The Black Knight]] is a regular NPC you fight in a mounted duel after a short (but annoying) quest chain. Being an agent of the Lich King, he comes back zombified as the final boss of the Trials of the Champion instance, resurrecting the announcer who he force choked earlier as a ghoul. You kill him, but you can't loot him. Because he's back ''again'', only this time, he's a skeleton. And then he summons about 10 ghouls. And then you kill him. And ''then'' he comes back as a ghost, even more powerful than the ten ghouls of the previous phase. Which you kill. He finally stays dead -- until tomorrow, when you do the instance again!
522** In the Icecrown Citadel raid dungeon, we have Professor Putricide (who happens to be one massive ShoutOut to [[WesternAnimation/{{Futurama}} Professor Farnsworth]]). He imbibes some of his own concoctions during the fight, causing him to become extremely muscular and grow a pair of tentacles from his back a la ComicBook/DoctorOctopus.
523*** Putricide is very much a parody of this trope. During his two transformations (it's a three-phase fight), he stuns the raid with "Tear Gas," runs to his lab bench, grabs a potion and declares "Hmm... I don't feel a thing. Whaaa?? Where'd ''those'' come from?" first, and "Tastes like... Cherry! Oh my! Excuse me!" the second time.
524*** Also during the fight, one of the raiders has to do this and become a Mutated Abomination and eat the ooze around the room that the Professor throws around and forms puddles.
525** The trash (ladies of the night) before the Maiden of Virtue (see the irony?) transform into their true form (succubus or undead) when they hit half health.
526** In the Dragon Soul, the final raid of ''Cataclysm'', Deathwing undergoes a transformation between his first and second encounter. At the end of the first, he crashes into the Maelstrom, and at the start of the second, emerges from it as a hideous monstrosity, complete with molten tentacles and appendages clinging to the platforms and attacking the players.
527* ''VideoGame/{{Xenogears}}'': Deus is first fought at a pivotal point during Disc 2 in a weakened state. After Fei defeated it, it regressed into an abyss to evolve itself until it regains its complete form for the endgame.
528* The final bosses of the main ''VideoGame/YokaiWatch'' games tend to resort to this:
529** After being beaten the first time, Chairman [=McKraken=] from ''VideoGame/YokaiWatch1'' manages to break the seals between the two worlds, absorbing their aura to become a crazy-looking head monster whose arms now function as his legs.
530** Likewise, Dame Dedtime from ''VideoGame/YokaiWatch2'' decides to absorb the positive thoughts of every human in Old Springsdale to become Dame Dreadful, a serpentine beast with a coiled body, four thin arms, black-feathered wings, and some thinner tentacle-like appendages she uses to steal your Yo-kai's stats.
531** Ghoulfather from ''VideoGame/YokaiWatch3'' also fights with a second form that drastically changes his appearance, using the power of the UFO Stone to become Don Spiracy, a monstrous version of himself with a second mouth which can spam various objects and creatures for each of his attacks. In the Blasters-T mode, he pulls if off again when it's revealed he survived, transforming into Goldfather (a golden dragon with treasure-like skin) by absorbing all of the Pyramid of Clu's gold.
532** Unlike the ''Shadowside'' anime, the final form of Overseer in ''VideoGame/YokaiWatch4'' mixes this with BishonenLine. He sheds a single tear, which proceeds to absorb his entire mass and clouds. After crashing to the ground, Overseer takes a humanoid shape, with black armor and his "clouds" serving as his cape. His sword is a more menacing version of the swords he uses in his first form.
533** Subverted with the final bosses of the ''[[VideoGame/YokaiWatchBlasters Blasters]]'' Games: Whisped Cream (both of his versions) will grow several times his size and fight the Blasters in Excellent Tower, and Kanaendesu will just stop possessing Catleen to fight the heroes directly. Also, Norukasoruka from ''Yo-kai Three Kingdoms'' actually is a desperate FusionDance of Noruka and Soruka, and it's stated they will be unable to undo the fusion.
534* ''VideoGame/YokusIslandExpress'': [[spoiler:As soon as Kickback reveals himself to be the God Slayer, he takes on a sinister clawed form. Then he takes on an even ''more'' monstrous form partway through the battle with him.]]
535* In ''VideoGame/{{Ys}}''
536** Garland in ''Wanderers'' and ''[[VideoGame/YsTheOathInFelghana Oath]]'' does this, as well as becoming LargeAndInCharge.
537** In ''VideoGame/YsIVTheDawnOfYs'', [[BigBad Arem]] transforms into a gigantic humanoid blob, after you defeat his normal and SuperMode forms. Actually more of a ClippedWingAngel.
538** In ''VideoGame/YsVLostKefinKingdomOfSand'', TheDragon, Dorman, and the BigBad SealedEvilInACan, Jabir, mutate into grotesque monsters for their boss battles; Dorman becomes a [[BatPeople bat-winged]] [[SpikesOfVillainy spiky-shouldered]] [[MagmaMan fire demon]] with FloatingLimbs, called "Adeptos Dorman" in the FanTranslation, while Jabir becomes a six-winged DraconicAbomination.
539** In ''VideoGame/YsVITheArkOfNapishtim'', Ernst uses the power of the ark to become a "two-winged dark angel". After his defeat and subsequent return to normal form, he tries to draw more power from the Ark, but suffers a fatal SuperPowerMeltdown and causes Napishtim to go haywire.
540* Doctor Tongue in ''VideoGame/ZombiesAteMyNeighbors'' quaffs his mad scientist potions and becomes, first, a giant spider, then a giant floating head of himself -- that fires tongues!
541* ''VideoGame/ZoneOfTheEnders: The 2nd Runner'' features Anubis fusing with the super weapon Aumaan, becoming Aumaan Anubis which stripped the mech of most of its armor and barely held together by a small number of wires and gaining a white color scheme. In place of its wings were a massive set of hexagonal plates ripped from the arena. Its already absurd power is shot up to eleven thanks to being fused with a weapon capable of [[spoiler:destroying the entire universe]]. Luckily, you get to fight it in Jehuty's own One-Winged Angel form it gets by absorbing regular Anubis's Metatron, which gives you the ability to one or two-hit kill any enemy and boss in the game.

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