When a person [[AppliedPhlebotinum taps into some mystical wellspring of power]], a common side effect is that their voice immediately plummets several octaves. Naturally, this is [[OhCrap a tell-tale sign]] that copious amounts of ass are about to be kicked.

When pulled off correctly, the results can be spectacular.

If the subject is a woman, this usually presents itself in the form of their voices sounding huskier and more sensual (remember, PowerIsSexy), although there ''are'' cases where their voices just become deeper and booming like the men.

May be justified if the power upgrade comes with HulkingOut or transforming into a OneWingedAngel: being larger probably corresponds with longer vocal chords, which produce deeper sounds.

Characters who are not, strictly speaking, examples of this trope may consciously alter their voices to sound deeper (or sexier) while in their heroic/villainous personas, in order to sound more impressive (or [[DistractedByTheSexy distracting]]) and to protect their [[SecretIdentity identities]].

SisterTrope to PowerEchoes, BadassBaritone and ContraltoOfDanger, and the neutral cousin of EvilSoundsDeep and VoiceOfTheLegion. It's not ''quite'' the same as BadassBaritone, although these two tropes aren't mutually exclusive. See also HeavyVoice.
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!!Examples:

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[[folder:Anime and Manga]]
* In ''Manga/SetoNoHanayome'', UnluckyEverydude Nagasumi turns into a [[Manga/FistOfTheNorthStar Kenshiro]] {{expy}} while under the influence of the Song of Heroes. Or just when sufficiently pissed off.
* ''Anime/YuGiOh'': Any time Yugi and his Millennium Puzzle-residing alter-ego do a MentalFusion, expect Yugi's voice to plummet faster than The Tower of Terror. This goes double for the dub, [[CompellingVoice thanks to none other than]] '''[[DanGreen DAN]] [[MemeticMutation GREEN]]!''' ([[VocalEvolution and it gets deeper over time]]). The voice is actually the Pharaoh's voice and is naturally that deep (so Yugi's just "borrowing" it) and in ''Anime/YuGiOhGX'', [[spoiler:older!Yugi]] is shown to have the exact same voice.
** [[SugarWiki/FunnyMoments Hilariously]] [[LampshadeHanging lampshaded]] in the first episode of ''WebVideo/YuGiOhTheAbridgedSeries'' by Kaiba.
-->'''Kaiba''': "Wait. Did your testicles just drop in the last five seconds or something? What the heck happened to your voice?"
** [[SealedEvilInACan Yami Bakura]] and [[SplitPersonality Yami Malik]] have also deeper voices than their host/other personality.
* [[VisualNovel/FateStayNight Archer's voice in comparison to Shirou's.]]
* In ''Manga/{{Bleach}}'', this happens to the Visored when they put on their [[SuperpoweredEvilSide hollow masks]].
** ''[[InvertedTrope Inverted]]'', whenever Ichigo transforms into a hollow. His voice gets ''higher''.
** Inverted again, with [[spoiler:Kaname Tousen]] whose voice gets higher after activating his Resurrección.
* In ''Manga/RosarioToVampire'', Inner Moka has a much deeper voice than Outer Moka. Ironically, Inner Moka is the real one, that means it's her natural voice.
* Manga/{{Naruto}}'s voice gets noticeably deeper while using Kyuubi's chakra.
** [[InvertedTrope Like Ichigo above]], Juugo's voice gets higher when he uses Level 2 of the Cursed Seal's power.
* [[Manga/DragonBall Goku and Gohan's]] voices got noticeably deeper when they transform into Super Saiyans 2 and 3 respectively.
** Goku's scream as he transforms into a Super Saiyan for the first time. More noticeable in ''[[Anime/DragonBallKai Kai]]''.
* [[spoiler:Mirajane Strauss]] from ''Manga/FairyTail'' voice gets deeper while using her Take Over Satan Soul.
* Also, Tsunayoshi Sawada from ''Manga/KatekyoHitmanReborn'' when in [[TranquilFury Hyper Dying Will Mode]].
* [[FriendlyNeighborhoodVampire Seras Victoria]] from ''Manga/{{Hellsing}}'' sounds much deeper after [[spoiler: drinking Pip's blood.]]
* [[Anime/FutariWaPrettyCure Honoka Yukishiro]] and [[Anime/YesPrettyCure5 Nozomi Yumehara]] from the ''Anime/PrettyCure franchise'' get noticeably deeper voices in their Cure forms, Cure White and Cure Dream, respectively. [[Anime/DokiDokiPrettyCure Aguri Madoka]], too, but in her case it's justified because Cure Ace is her OlderAlterEgo.
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[[folder:Comic Books]]
* In the Franchise/MarvelUniverse, Tyrone Johnson's voice became much lower when he changed to his [[ComicBook/CloakAndDagger Cloak]] superhero identity.
* The comic versions of Comicbook/GhostRider all get deep, scary voices once they change from their human identities to the Rider. Typically, it's represented by a change in their speech bubbles (speaking in italics, with the bubbles now outlined in black fire, or speaking in white text in black bubbles, and so on).
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[[folder:Fan Fiction]]
* Averted in ''FanFic/{{Nexus}}''. When Jack's in his demon form, his voice has a metallic edge; much like the Autobots.
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[[folder:Film]]
* Blackheart from the movie ''Film/GhostRider'' gets this magical power once he summons 1000 souls into his body. That may have been the only benefit from the whole deal; unless standing around getting blown up so you can slowly reform again is highly sought after in demon society.
* [[PlayedForLaughs Done for humorous effect]] in ''Film/BatmanForever'':
-->'''The Riddler:''' "For if knowledge is power, then '''''{{A GOD AM I}}!'''''" ({{beat}}) "Was that over the top? I can never tell!"
* Galadriel's voice got pretty deep (and reverbed) in the first ''Film/TheLordOfTheRings'' film when she was ''imagining'' what she would do with the kind of power provided by the One Ring. However, Galadriel is already plenty powerful, so all the deep voice and special effects that went with it were her own doing.
** In the book, her normal speaking voice is described as "clear and musical, but deeper than woman's wont."
* When [[spoiler:Tia Dalma]] once again becomes the sea goddess Calypso in the third ''Film/PiratesOfTheCaribbean'' film, her voice grows extremely deep and reverbed. It could be because she was also extremely pissed off. [[AttackOfThe50FootWhatever Growing to a size so massive]] that she dwarfed the ''Black Pearl'' and all of its crew might've also had something to do with it.
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[[folder:Literature]]
* The High Seekers in the ''[[Literature/{{Emberverse}} Novels of the Change]]'', controlled by some unearthly force, sometimes go so deep that it's represented by boldface. This usually heralds the good guys getting a royal spanking.
* Subverted in ''Literature/ArtemisFowl'', when the characters expect this, but get a falsetto instead.
-->'''Number 1:''' "I know. Less airy, more fairy, right?"
* In the Franchise/StarWarsExpandedUniverse there are a few times when the SentientCosmicForce decides to convey something to a young Force-Sensitive in a less ambiguous fashion than usual, and actually takes on a voice that seems to come from deep inside of the person. This either sounds like someone the person knows who has died and joined with TheForce, or it sounds a lot like ''them''.
** ''Rebel Force'' has Luke Skywalker think that the voice sounds like his, but deeper, older, more certain. He assumes it's his father's voice encouraging him from beyond the grave. [[LukeIAmYourFather We know it's not.]]
** ''Literature/GalaxyOfFear'' has Tash Arranda similarly encouraged and hearing an older-Tash voice. Before that, the Force swells in her when she's commanding someone to stop and not kill [[spoiler: her uncle]] and she doesn't recognize it as hers - it's lower, commanding, and forceful.
* Zoey from the ''Literature/TheHouseOfNight'' series experienced this during a certain [[BigLippedAlligatorMoment infamous scene]] in ''Chosen''.
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[[folder:Live Action Television]]
* DoctorFate in ''Series/{{Smallville}}'' sounds deeper than Kent Nelson.
* Willow in ''Series/BuffyTheVampireSlayer'' gets amped up on mystical magic powers and Creator/AlysonHannigan speaks the character with a ''slightly'' lower and slower tone and speed.
* Bailey from ''[[Series/TheSuiteLifeOfZackAndCody Suite Life on Deck]]'' when she's possessed by Princess Xaria. This also happens to London in the same episode, but as a closing gag.
* Anyone in ''Series/StargateSG1'', when possessed by a Goa'uld symbiote, although it's actually the Goa'ulds invoking the trope. They can use normal voices if they want to, but they want people to think that they're all-powerful gods, so they change their voice to match people's expectations.
* ''Series/{{Merlin}}'' gets into this when Merlin begins speaking Dragon-language. His regular magic doesn't usually deepen his voice, but the dragon calls do.
* ''Series/{{Supernatural}}''[='s=] Misha Collins made a deliberate decision to have his voice as Castiel, the extremely powerful angel, be deeper than his normal voice--it was a one-shot character, right? Four seasons later he kind of regrets it. He got to use his normal voice in ''one episode'', in which the man Castiel has been using as a vessel appears.
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[[folder:Radio]]
* [[OlderThanTelevision This trope's roots may have sprouted from]] the radio drama ''Radio/TheAdventuresOfSuperman'', in which the same voice actor used his tenor range for Clark Kent and his baritone range for the superhero. Most exemplified when, in order to show that Clark Kent was changing outfits, the voice actor would start out in his Clark Kent tenor saying "This looks like a job," then his voice would drop nearly an octave and he'd finish with "for Superman!"
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[[folder:Video Games]]
* [[VideoGame/{{Onimusha}} (Kajin no) Soki]] in ''[[VideoGame/TatsunokoVsCapcom Tatsunoko vs. Capcom]]''. For his [[LimitBreak Level 3 Hyper]], he assumes his [[DarkIsNotEvil Black Oni]] [[PhysicalGod Onimusha]] [[SuperMode form]], donning a {{mask|OfPower}} with {{red eyes|TakeWarning}} and a mane of white hair. His voice goes from "BoisterousBruiser" to "Holy hell! He sounds like {{Satan}}!" Said voice is also [[PowerEchoes booming]] and [[TheUnintelligible incomprehensible]], but his voice drops from bass to baritone in no time flat.
* In ''VideoGame/DevilMayCry 2'' ([[FanonDiscontinuity the one nobody talks about]]), when Dante's [[DesperationAttack health is at critical levels]] (his lifebar will be flashing red), activating his [[SuperMode Devil Trigger]] will cause Dante to morph into a stronger, bigger, [[NighInvulnerability invincible]] alternate form (Devil Trigger Majin Form) able to mow do ''anything'' in the game with ease. While all of Dante's Devil Triggers [[PowerEchoes echo]] ([[EarlyInstallmentWeirdness except for in the first game]]), this one has a much deeper, demonic sounding voice.
** In ''Devil May Cry 3'', [[spoiler:Arkham]] manages to unlock the dormant power of the [[SwordOfPlotAdvancement Sparda sword]]. Three guesses on what happens to his voice.
** Nelo Angelo (aka [[spoiler:a BrainwashedAndCrazy [[EvilTwin Vergil]]]]) has an unnaturally low voice. According to [[WordOfGod The History of DMC]], [[spoiler:[[BigBad Mundus]] destroyed Vergil's original body and placed his soul into an artificial, yet powerful construct.]] Compare this to [[spoiler:Vergil in ''3'']], where his original form had a slightly raspy, but still normal-sounding voice.
** Arius, the BigBad of ''2'', gets a deeper voice when [[spoiler:he's killed and revived as a demon by [[BiggerBad Argosax's]] power.]]
* Invoked in ''[[VideoGame/Jak3Wastelander Jak 3]]'', where the Precursors, revealed to be [[spoiler:fuzzy little Ottsels]] with not-so-impressive voices, use a voice-manipulating device to get that "uber powerful ancient" boom. They know they wouldn't be taken seriously without it.
* In ''VideoGame/GuildWars: Nightfall'', [[spoiler:Kormir's]] voice becomes layered over a less high voice when [[spoiler:she replaces Abaddon as the God of Secrets]].
* When [[Franchise/TheLegendOfZelda Link]] wears the [[EleventhHourSuperpower Fierce Deity Mask]] in ''[[VideoGame/TheLegendOfZeldaMajorasMask The Legend of Zelda: Majora's Mask]]'', he physically becomes older, and therefore his voice becomes deeper.
* In ''VideoGame/ViewtifulJoe 2'', when [[spoiler:Blade Master Alastor]] is defeated, [[ArtifactOfDoom the Black Film]] controls/empowers him, warping him into the even more demonic [[spoiler:Underworld Emperor Alastor]]. When the transformation is complete, his voice quickly deepens. [[TrickBoss Cue Round 2]], where he has a slew of new tricks, more power and defense, and a much larger healthbar.
* In ''[[VideoGame/CastlevaniaRondoOfBlood Castlevania: Rondo of Blood]]'', Dracula's voice deepens mid-''word'' as he transforms into a massive bat-creature for the second part of the battle. Conversely, when that form is defeated, he roars in pain, and his voice spontaneously ''rises'' back to normal as his transformation is forced to revert.
** Dracula's more recent cases of OneWingedAngel forms exhibit this as well, either during or after his transformation. Other examples include ''[[VideoGame/CastlevaniaSymphonyOfTheNight Symphony of the Night]]'', ''[[VideoGame/CastlevaniaPortraitOfRuin Portrait of Ruin]]'', ''[[VideoGame/CastlevaniaTheDraculaXChronicles The Dracula X Chronicles]]'' (a [[VideoGameRemake remake]] of ''Rondo''), and ''[[VideoGame/CastlevaniaHarmonyOfDespair Harmony of Despair]]''.
* ''VideoGame/{{Dota 2}}'':
** Undying, [[OurZombiesAreDifferent a zombie]] whose ultimate is an ability which transforms him into a much beefier version of his regular self. [[http://www.youtube.com/watch?v=g0OX247BKdg That includes his voice.]] (This soundset can be heard from 1:14.)
** Earthshaker's voice is automatically ridiculously deep, and [[ForMassiveDamage you better believe]] [[EarthquakeMachine that he lives]] [[GroundShatteringLanding up to]] [[MeaningfulName his name.]]
** One of Terrorblade's abilities also transforms him into a demon, which obviously simultaneously makes him both more powerful and makes his voice even deeper, too.
* ''VideoGame/HearthstoneHeroesOfWarcraft'' couples this with one card's mechanic. The card, Questing Adventurer (3 mana, 2/2, gains +1/+1 for every card you play), has his voice grow deeper as his effect stacks.
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[[folder:Webcomics]]
* [[LampshadeHanging Lampshaded]] in the ''Webcomic/TheOrderOfTheStick'' prequel ''Start of Darkness''. When Xykon becomes a lich, he expresses admiration for his new voice and repeats several Creator/JamesEarlJones-isms.
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[[folder:Web Original]]
* {{Inverted|Trope}} in the ''Eskimo Bob'' episode "The Swarm." When Yuck absorbs all his clones and takes on his OneWingedAngel form, his voice actually becomes ''more'' high-pitched.
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[[folder:Western Animation]]
* Mike Morningstar from his debut in ''[[WesternAnimation/Ben10AlienForce Ben 10: Alien Force]]'', where he uses the full extent of his powers after [[TheMole revealing himself to be]] [[EvilAllAlong the villain of that episode]] and siphoning off of Gwen's mana. His skin [[GoldenSuperMode turns gold]], while his voice noticeably deepens and [[PowerEchoes gains an echo effect]]. When {{depower}}ed, Mike's voice returns to normal. As Darkstar, however, it's back to said deepness, but this is a subversion, as it's an effect of his CoolMask.
* Both [[WesternAnimation/HeManAndTheMastersOfTheUniverse1983 He-Man]] and [[WesternAnimation/SheRaPrincessOfPower She-Ra]]'s voices get significantly deeper when they do [[ByThePowerOfGreyskull their]] {{Transformation Sequence}}s. Overlaps with OlderAlterEgo.
* The WesternAnimation/SupermanTheatricalCartoons did the same thing as the radio serials (using the same actor, no less).
* In ''[[WesternAnimation/{{Thundercats 2011}} ThunderCats (2011)]]'', Lion-O's voice gets deeper whenever he uses the [[InfinityPlusOneSword Sword of Omens]] and [[ByThePowerOfGrayskull shouts "ThunderCats, ho!"]]
* In Creator/RalphBakshi's animated ''Franchise/{{Spider-Man}}'' [[WesternAnimation/SpiderMan1967 series from the 1960s]], Peter Parker deepens his voice while donning the Spidey suit.
* In ''[[WesternAnimation/{{Spider-ManTheAnimatedSeries}} Spider-Man: The Animated Series]]'', [[AmazonianBeauty Black Cat's]] voice gets deeper when she [[GrowingMusclesSequence transforms]] or uses her powers.
* In ''WesternAnimation/IronManArmoredAdventures'', Pepper incorrectly answers the test in the trial for uncovering the fifth Makulan ring. This results in her being taken over by [[MagmaMan a volcanic entity]] (which was previously controlling Rhodey), gaining [[PlayingWithFire fire powers]] and a booming voice, and going into a berserk fury while shouting lines like, "You are not worthy!" as the energies within her body [[TheEndOfTheWorldAsWeKnowIt threaten to cause worldwide volcanic eruptions]] [[ApocalypseHow that will eventually blot out the sun.]]
* When Avatars such as [[WesternAnimation/AvatarTheLastAirbender Aang]] and [[WesternAnimation/TheLegendOfKorra Korra]] go into the Avatar State, this is the general effect--though it's because the spirits of hundreds of past lives are speaking through them, [[VoiceOfTheLegion all at once]].
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[[folder:Other]]
* TruthInTelevision, funnily enough. Men will subconsciously deepen their voices if they feel confident or superior to the person they're talking to. (And the other way around--if you feel inferior, your voice gets higher.) Has to do with establishing dominance. Hence, not only will a person with a very deep, gravely voice subconsciously be seen as a powerful individual, BEING powerful will also cause you to lower your voice without realizing it.
* Male frogs and toads developed their extensible chin pouches so that their mating calls would sound deeper and more resonant. This suggests larger body size to females, which [[BiggerIsBetter seek out the biggest males]] to father their offspring (because only males with a good set of genes live long enough to ''grow'' big).
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