[[quoteright:326:http://static.tvtropes.org/pmwiki/pub/images/DeusEx_1566.jpg]]
[[caption-width-right:326:[- JC Denton works on his tan. -] ]]

->''"You will soon have your god, and you will make it with your own hands."''
-->-- '''[[DeusEstMachina Morpheus]]'''

''Deus Ex'' is an award-winning FirstPersonShooter with RPGElements developed by Ion Storm Austin (A division of, yes, ''[[{{VideoGame/Daikatana}} that]]'' Ion Storm) and published by Eidos. It was released around the summer of [[TurnOfTheMillennium 2000]] for Windows and [[AppleMacintosh Macintosh]]. A PS2 port, titled ''Deus Ex: The Conspiracy'', was released in spring 2002. The PS2 version was made available on the PSN Store, as a PS2 Classic, on May 16, 2012 in Europe.

In the [[{{Dystopia}} dystopian]] [[TwentyMinutesIntoTheFuture near]] [[{{Cyberpunk}} future]], a [[ThePlague deadly plague]] known as the [[{{Nanomachines}} Gray Death]] has befallen mankind. The only known "[[YouFailYourMedicalBoardsForever vaccine]]", Ambrosia, the distribution of which is tightly controlled by Orwellian government agencies, merely delays the inevitable. Terrorist groups are capitalizing on the increasing desperation of the common folk, and their increasing activity urges world governments to create the UsefulNotes/UnitedNations Anti-Terrorist Coalition (UNATCO). You follow [[WhatDoYouMeanItsNotSymbolic JC]] Denton, a [[NaiveNewcomer rookie]] [[ElitesAreMoreGlamorous elite]] UNATCO operative, who eventually becomes tangled in a conspiracy plot [[ConspiracyKitchenSink involving]] the [[AncientConspiracy Illuminati]], [[{{Chupacabra}} Chupacabras]], [[TheGreys Greys]], [[BlackHelicopter black helicopters]], genetic design [[ElaborateUndergroundBase underground labs]] and [[AIIsACrapshoot rogue AIs]].

The gameplay combines FirstPersonShooter, StealthBasedGame and RPGElements – as you progress through the game you receive {{skillpoint}}s to upgrade your various skills. You also collect "[[BioAugmentation augmentation canisters]]," which work as cybernetic implants, giving JC extraordinary abilities at the cost of energy. Even though the gameplay has its flaws, its non-linearity and interactivity have received much praise from the press and players - it is actually possible to go through the game [[PacifistRun killing almost nobody]].

''Deus Ex'' has had several games follow in its wake. The original developers released ''VideoGame/DeusExInvisibleWar'' in 2003, seen as a ContestedSequel by the fandom due to the drastic changes in gameplay and story. A prequel, ''VideoGame/DeusExHumanRevolution'', was released by Eidos Montreal in late August 2011.

In 2004, Eidos released ''Project: Snowblind'', a SpiritualSuccessor that began life as ''Deus Ex: Clan Wars'' until ''Invisible War'' sold poorly.

The game is also known for its relatively active modding community. 2006 saw the release of the ''VideoGame/{{Zodiac}}'' mod, a fan-made {{Interquel}} that allows you to play as Paul Denton. In 2009, the most notable of the game's total conversion mods, ''TheNamelessMod'' was released, featuring an original non-linear plot and fully voiced dialogue. A fan-made prequel, ''[[VideoGame/TwentyTwentySeven 2027]]'' featuring DirectX 9 graphics, and a non-linear plot was released in 2011. Latest mod to make a wide impact was ''[[VideoGame/DeusExNihilum Deus Ex: Nihilum]]'' in 2013, set in an alternate continuity few years before the canonical start of the game.

'''Please add any examples relating to ''[[VideoGame/DeusExInvisibleWar Invisible War]]'' and ''[[VideoGame/DeusExHumanRevolution Human Revolution]]'' to their dedicated pages.'''

----
!!This game provides examples of:

* AbsurdlySharpBlade: [[GameBreaker The Dragon's Tooth sword]]. With the required skills and augmentation, you can cut even open some doors or chests that otherwise don't take scratch damage.
* AbsurdlySpaciousSewer: Sewer levels in New York and [[TruthInTelevision Paris]].
* AdultFear: The player has the option to read the emails of a cyborg government agent. In one email he expresses fears about new innovation's in cybernetics that will render him obsolete and useless thus forcing the government to fire him and leaving him without specialist care he requires to function.
* AIIsACrapshoot: Daedalus was specifically programmed [[ExactWords to hunt down terrorist groups]]. Unfortunately for its creators, [[HoistByHisOwnPetard they qualified]]. By the same token, Helios' entire ''raison d'etre'' was the efficient administration of the world, a task which it quickly realised a self-obsessed psychopath like [[spoiler:Bob Page]] would just get in the way of. Icarus was always a [[JerkAss jerk]], because it was programmed to be that way.
** Morpheus completely averts this since it's only a simple prototype and does pretty much as instructed.
* AirVentPassageway: JC seemingly spends a good deal of his time crawling around in air vents and maintenance tunnels of all sizes and colors worldwide. You do have to watch out for acid-spewing greasels (which are annoying and/or dangerous, depending on the difficulty level) that tend to reside in the crawlspaces.
* AlwaysNight: Because the game's stealth system is shadow based, all levels take place at night (some may take place during the day, but you are underground and won't notice).
* AncientConspiracy: The Illuminati, as seen in works such as ''[[{{Illuminatus}} The Illuminatus! Trilogy]]'', ''Literature/FoucaultsPendulum'' or ''[[AngelsAndDemons Angels & Demons]]''.
* ApocalypseHow: Destroying the Aquinas hub knocks the world back into a new Dark Age as all global communication and commerce is wiped out. To quote Tracer Tong: "No more infolinks, no transmissions of any kind - we'll start over, live in villages." Destroying it doesn't directly cause more deaths, but humans have been dropping like flies since before the game begins.
* AppliedPhlebotinum. Minimally invasive human augmentation? [[{{Nanotechnology}} Nanites]]. AbsurdlySharpBlade? [[{{Nanotechnology}} Nanites]]. Engineered plague with artificially scarce treatment? [[{{Nanotechnology}} NANITES,]] [[VideoGame/MetalGearRisingRevengeance SON!]]
* ArbitrarySkepticism:
** JC has just learned [[ConspiracyKitchenSink that the UN is a front for MJ12 who have a base in the sewers and kidnap people, encountered Grays, learned of the existence of a machine that can just make just about anything desired and been attacked by mutant monsters.]] After all this, he thinks someone is making a poorly-timed joke when they say TheIlluminati is real.
** In the very beginning, if you give beer to Jock for information, he spoils the whole game's plot right there, although a first-time player who hasn't had the plot spoiled for him would just assume he is just making an educated (or overly paranoid) guess at the time. JC is quick to dismiss it as a crackpot theory, but as the game goes by, [[ProperlyParanoid ''everything'' he said was true.]]
* ArcNumber: [[{{Fahrenheit451}} 451]].
* ArtificialStupidity: When a hostile enemy chases you you can hide in a dark corner for a few seconds and they will go back to acting as if you didn't do anything. Even if they see you run into an air vent they will say you 'disappeared'. Leave dead bodies of a dozen allies in the hall, an enemy will get upset for few seconds... then return to his regular patrol by walking right over the corpses of his allies. Shoot someone with a tranq dart then hide? He will go back to his patrol even as the poison in the dart slowly incapacitates him. Really most stealth playthroughs are less about true stealth and more about abusing artificial stupidity by crawling into an air vent and waiting for the person chasing you to forget you exist.
** One fan theory suggests that the game [[HollywoodDarkness is a lot more shadowy than what is shown]], thanks to JC's vision, so he really is disappearing into shadows, at least to the mooks. No word on how this works in brightly-lit labs or against augmented enemies.
** Troopers react oddly to sound. They will cheerfully ignore a crossbow dart piercing the wall mere inches away from their eye socket, but are able to hear the drop of a box of cigarettes in the bathroom from behind the closed blast doors of the security checkpoint across the corridor.
** If there is an alarm button in the area, the most efficient way of dealing with early guards is to blow your cover. The guards will prioritize sounding the alarm over anything else, even if it implies turning their back on you, allowing for an [[TapOnTheHead instant knockout]] with a [[BackStab single swing]] of the melee weapon of your choice.
* AsianSpeekeeEngrish: Due to the bad voice-acting a lot of the dialogue sounds like this like the infamous "In the fresh" line.
* {{Autodoc}}: There are healing robots that can heal the player fully without using resources and perform surgery to install augmentations.
* AwesomeButImpractical: The assault rifle is the only full-auto weapon in the game, but it's highly inaccurate, and its damage per shot is the lowest of all the weapons, meaning it usually takes between a third to a half of a whole magazine to take down just ''one'' enemy. Damage, recoil and ammo cap mods make it a bit better, as does the suppressor and the general high rate of ammo availability, but the game's other weapons can do all the things it does, only better.
** In contrast, the sawed-off shotgun's extremely high damage output is hampered by its [[ShortRangeShotgun short range]], slow rate of fire, and long reload time.
** The heavy weapons tend to fall into this, too, mostly because their ammunition is hard to come by, and also because they are extremely bulky and heavy, so unless player develops JC into a heavy weapons specialist, said weapons are more a liability than help. The GEP gun is about the only one that's anyway useful.
*** The plasma rifle is particularly bad about this; despite being conceptually and visually awesome, whether its splash (or even primary) damage actually affects enemies where it hits seems to be basically a crapshoot. A lot of this is actually caused by a bug which applies the weapon projectile's lower damage in multiplayer to the singleplayer game as well. The weapon is meant to be a staggering five times more powerful per shot than it actually is.
** The Healing Augmentation, while useful as noted below, works by healing a certain number of hit points every second or so once activated, and it switches back off if you're at full health when it's due to repeat. At maximum level, it heals so much damage per second that you may (briefly) hit full health again in the middle of a firefight you were counting on it to keep you alive through, forcing you to switch it back on manually when you can't really afford to be distracted.
* BadassCreed: In the "[[spoiler: Kill Bob Page]]" ending:
-->'''Morgan Everett:''' We are the Invisible Hand. We are the Illuminati. We come before and after. We are forever. And eventually... eventually we will lead them into the day.
* BadassLongcoat: JC Denton and several other characters. Both {{lampshaded}} and {{invoked}} / {{exploited}} in story.
* BackStab: Attacks to the torso of unaware enemies from behind do significantly more damage, often an instant kill or knock out. Works on every humanoid enemy (yes, even [[EliteMooks MJ12 Commandos]]!), but the targeted area for instant takedowns seems to differ with the toughest troops.
* BenevolentConspiracy: Morgan Everett does his best to portray the Illuminati as this, going so far as to claim "there's such a thing as a compassionate conspiracy". To be fair, they actually come across as such, too, particularly when compared to the more immediate and malevolent threat of their defected spin-off organization Majestic-12, who they actively help Denton fight against. [[spoiler:You can even choose to put them back in power, under this reasoning, in the "Kill Bob Page" ending.]] However, Majestic-12's AI, Icarus, is quick to warn Denton that this is all just an act, and that for all their friendly relations with him, they're ''really'' no better. [[spoiler: And if their portrayal of them in the prequel is any hint, you may just be buying the world more time before the next dark times, rather than outright saving it.]]
* BigApplesauce: [[HarsherInHindsight Has been the site of repeated terrorist attacks]], and is the location for much of the early game.
* BigBadDuumvirate: [[spoiler: Bob Page and Walton Simons.]]
* BigNameFan: In universe. Bob Page is a huge fan of Thomas Aquinas, the monk who wrote the ''Summa Theologiae''. If you have an idea what it was all about, Page's end goal ambitions are rather explicitly spelled out for you.
* BlackAndGreyMorality: Though JC, Paul, Jock, Alex and Dr. Reyes are generally pretty good people, the rest of LaResistance are [[RightWingMilitiaFanatic right-wing militia fanatics]], [[TheTriadsAndTheTongs the Chinese mafia]], [[AncientConspiracy the Illuminati]], an enclave of {{Mad Scientist}}s, and [[BigBrotherIsWatching an AI that controls all of global communication.]] All these groups agree on what is Black, on what they are fighting -- but we have to wonder what happens to the world once these folks are empowered.
** Although as the Big Bad mentions in the opening cutscene, [[spoiler: X-51 have certain ethical limits that MJ-12 don't share]].
** In one of the endings we also learn that [[spoiler: The Illuminati have exactly the same modus operandi as MJ-12, complete with ending scene mirroring the intro]].
* BlackHelicopter: Jock's helicopter.
* BloodKnight: Most of UNATCO. JC can either join in and be liked by his senior agents or be more humane and earn their contempt.
** [[DefectorFromDecadence Except for Carter.]]
* BodyArmorAsHitPoints: Averted. While JC technically wears a ballistic vest all the time, he can only "use" the vests he finds lying around.
* BookEnds: The [[spoiler: "Kill Bob Page"]] ending of ''Deus Ex'' is a mirror to the opening scene.
* BoozeBasedBuff: Any alcoholic drink will net you two points of health, at the cost of blurred vision for a set amount of time. While this may seem small, if you find your way into the backroom of a bar, or collect enough bottles of alcohol that are lying around (which are alot) you can have a poor-man's health pack, at the cost of temporary blurred vision.
* BoringButPractical: The pistol, both the stealth and the standard one. The ammo for the pistol is quite common, not to mention you can [[SniperPistol slap on a scope,]] giving you a mini-sniper rifle. The only thing the pistol is worthless against really is the bots, which are no trouble if you stock up on EMP/Scramble grenades and/or explosives, or hack them to be turned off or on your side. Plus, you start off with training in the pistol skill, whereas the other weapon classes set to untrained by default.
** The combat shotgun, when loaded with buckshot, is pretty useful for anti-personnal situations, and sabot rounds are useful against smaller bots, especially if you run into spiderbots in air vents. Ammo is pretty common for it, and if you have a Master in rifle skill, the spread is ''non-existent'', giving you a powerful marksmen rifle.
* BrainComputerInterface: Occipital jacks are mentioned.
* BrandX: The vending machines throughout the game contain products which match the color schemes of numerous real-world candy bars, chips, and soft drinks, but the low-res image makes them indistinguishable enough for copyright purposes.
** The soda's description even lampshades this trope.
* ButThouMust: Several times in ''Deus Ex'', such as sending the signal, surrendering to an "overwhelming" (invincible) force, and finding out where the AncientConspiracy base is (both options result in [[InstantSedation getting knocked out]] and dragged there).
** Originally, some DummiedOut code showed that the player [[spoiler: could have stayed loyal to UNATCO, but the option was removed. A video of the conversation can be seen [[http://www.youtube.com/watch?v=-cEg5Xo7VFU&feature=related here.]] ]]
** The game actually does a good job of setting up situations that seem like ButThouMust, but then allows the player to subvert them. One example is when [[spoiler: JC's brother Paul is dying via a very slow killswitch, and there's a huge force of powerful enemies getting ready to storm the room they're in. The logical thing for JC to do is run away, leaving Paul to be killed by the incoming forces ([[IWillOnlySlowYouDown Paul actually suggests this!]]). However, if the player stays and fights, then Paul will live, no matter what happens in the ensuing battle. Either you leave through the front door (and get captured), or you get knocked out and wake up in the next area.]]
** Which can be quite frustrating to a player that doesn't know this who [[spoiler: defeats all the attacking guards in the hotel to save Paul's life and then reverts back to their preferred stealth tactics by leaving through the back window. Only to learn several hours later that Paul was 'killed' and assuming that it was a but thou must situation]]
** [[spoiler:Or TakeAThirdOption: You can try to KILL Paul instead, which does not work, but he apparently gets fired up enough to survive the assault.]]
** Also, [[spoiler: [[NoCanonForTheWicked Paul lives]]]] in the second game. And this time around, you actually can change that near the end.
* CaliforniaCollapse: Happened in the backstory; maps will be conspicuously missing California and the Baja peninsula.
* CantGetAwayWithNuthin: The games contain an incredibly complex series of flags that influence almost everything you do. If you walk into the women's bathroom at UNATCO HQ, Manderly WILL remind you of it when you go to your mission briefings. Other dialogue options will be influenced depending almost entirely on what you do and when you do it. For example, a robber in Paris will hire you to case up the local bakery for some vials of Zyme hidden away in the oven. If you break into the place before even talking to him, you'll mention that you already broke into it.
* DieChairDie: Nearly every object in the game is destroyable, from chairs, to frying pans, to rubbish bins and so on.
* ChekhovsGunman: Aside from Bob Page and Walton Simons, Maggie Chow can be seen in the background of the opening cinematic.
** ''Everyone'' is there, including Reyes, the M.I.B.s, and so on.
* {{Chupacabra}}: Gʁeen gʁeasy gʁeasels.
* ColorCodedForYourConvenience: Luminous blue indicates you are dealing with something high tech[[note]]examples:JC's eyes, aug canisters, the noticeably non-human parts of mech augs and the Morpheus AI's avatar for starters[[/note]].
* ColorWash: Blue is primarily used to signify anything related to [[ColorCodedForYourConvenience high technology or augmented characters]].
* TheComicallySerious: Denton, again.
* ConspiracyKitchenSink: One of the best sinks around. All conspiracy theories are true, and all at the same time. The game even has references to ''TheManWhoWasThursday''--one of the earliest grand conspiracy thrillers.
** However, the game's version of Majestic-12 seems to have nothing to do with its (supposed) real-world namesake apart from being a secretive group in general.
* ContemplateOurNavels: Seems to be a preferred passtime by pretty much everyone in the future. ''Everyone'' has complex, heavily researched and contemplated philosophies which guide their actions, and they're eager to share them-even if [[JustBetweenYouAndMe they plan to kill you afterward]]. [[TropesAreNotBad It's the key to the fanbase]].
* CrapsackWorld: Everyone is dying from a mysterious plague, martial law has been declared everywhere while rampant terrorism occurs unabated. Warren Spector has described ''Deus Ex'' as a story set "five minutes before the fall of human civilization."
** If a plan called "New dark age" sounds like a good idea, you know you are screwed.
* CrazyCatLady: Aimee, in the condemned building in Paris.
* CriticalExistenceFailure: Going around with 0 HP in every limb cripples you severely, but though you do bleed a lot, it never actually kills you. This is probably because of the nanomachines in your body keeping you alive to the fullest extent possible until you can replenish your health, by sealing your wounds and preventing infection and shock from setting in. Strangely, [=NPCs=] have the same ability to a lesser degree...
* CyberPunk: The series crosses the whole spectrum between this and PostCyberpunk. ''Deus Ex'' itself straddles the dividing line.
* CyberPunkIsTechno: The soundtrack for certain areas reflect this, along with the nightclubs.
* {{Deconstruction}}: Of the FPS. If you play the typical FPS method of simply taking down your enemies, the game [[YouBastard goes out of its way]] to make you feel like shit for killing people. [[spoiler: To add even more sting, many of the game's prominent characters will commend you for your willingness to mindlessly kill everything that moves in early missions, only for a PlotTwist to make you realize you've been murdering the good guys.]]
* DeadpanSnarker: Being a general cool cat, JC exhibits traits of this every now and then. He gets more cynical as the game progresses. Played absolutely straight regarding the ''deadpan'' aspect from the start on though (the only bit of dialogue in which you can actually hear him chuckle is triggered by a pretty complex series of actions, which is described in detail on [[TheDevTeamThinksOfEverything/DeusEx this subpage]]).
* DeusEstMachina: One of the endings for both games, although it requires a merger with a willing human element (found in [[spoiler: JC Denton]].
* DeusExitMachina: The [[spoiler:nano-aug agents' killswitch]] mainly serves to remove the more-experienced and equally-powerful Paul from the plot and force the focus onto JC (who has his activated - and wins a race with the clock to deactivate it.)
* TheDevTeamThinksOfEverything: [[TheDevTeamThinksOfEverything/DeusEx Has its own sub-page.]]
* [[spoiler:DidNotDieThatWay]]: JC was told that his parents had died in a car crash. They were, of course, [[spoiler:put down for protesting the things that Bob Page was doing to young JC]].
* DigitalPiracyIsEvil: From the UNATCO handbook:
-->Gullible and greedy, this army of middlemen remain insensitive to how their violations of intellectual property and copyright laws damage the global information economy.
** But also parodied in a conversation with Tracer Tong; when you enter a PC software store in Paris, Tong radios in and informs you not to waste your money, as everything in the store can be had for pennies on the streets of Hong Kong.
* DiskOneNuke: Picking the [=GEP=] gun when offered to you by Paul is probably the best choice, not only because the other two options, the sniper rifle and crossbow, can be found on the level, but since rockets can be easily found throughout the game, it can be used to breach doors and take out camera and turrets, saving you lockpicks and multitools.
** TheNamelessMod apparently [[TheDevTeamThinksOfEverything realized this,]] and most doors in the game have infinite strength, which keeps you from blowing them open, and rockets aren't as easy to come by.
* DividedStatesOfAmerica: If you talk to a bum in Battery Park, you will hear him mention about the Northwest War and the early days of the [=NSF=]. If you [[AllThereInTheManual look into this,]] the game's backstory mentions that after the West Coast was devastated by a massive earthquake (the after effects can be seen on world maps throughout the game), several states seceded from the Union after they felt like the Federal government abandoned them. The country is back together, but remarks made by JC hint that the US is on the verge for a third civil war.
* DoNotRunWithAGun: Only the poorly trained NSF do it -- presumably they need the accuracy bonus granted from standing still. More advanced foes like [=MJ12=] commandos or UNATCO troops will run and gun, although the running often consists of running at you in a straight line or occasionally circle-strafing.
** The player too, can have weapon accuracy thrown off by moving quickly. However, a sufficient amount of skill points invested in the category of weapon used, as well as stability weapon mods, will mitigate this by degrees (and enough of them will do so completely.)
* DoubleMeaningTitle
* DownerEnding: Technically all of the endings have their downsides ([[spoiler:have the Illuminati control the world, plunge the world into a new dark age, becoming a benevolent PhysicalGod]]), but considering just how horrible the world is in this game, any of the above can be legitimately argued to be an improvement over the status quo.
* TheDriver: Jock.
* DrunkenMaster: Jock, to an extent. The first time he gives JC a ride, he'll bring up that fact that he was just drinking in the bar not too long ago. Jock will point out that he's a better pilot when he is not wound up.
** Averted with JC however. Being drunk will put you at a disadvantage in combat and just getting around, as your vision will be messed up.
* DullSurprise: [[PlayerCharacter JC Denton]]. Partly due to the monotone attempt at DirtyHarry, and partly due to the limitations of the Unreal engine.
** [[http://www.youtube.com/watch?v=NG1qKzIsisU Oh my God, JC a Bomb!]]
* DumbMuscle: Logging into Gunther's email account reveals a distressingly high rate of grammar and ortography errors. He might be [[EloquentInMyNativeTongue Eloquent In His Native Tongue]] though.
** That's probably more down to the fact that his fingers are too big to operate a keyboard properly.
* DummiedOut:
** There is a conversation that can be brought up with editing tools that hints that the player [[spoiler: could have stayed loyal to [=UNATCO=].]]
** A message left on a phone in Paul's apartment [[spoiler: that hints towards his loyalties to the [=NSF=].]]
** At the terminal in the airfield, you could find a [=VOIP=] conversation between Juan and Tracer. [[spoiler: Tracer wants Juan to kill JC, as he considers him to be a risk, but Juan believes he will switch sides.]] Both this conversation and the answering machine conversation have been brought back with mods such as Shifter however.
* EndOfTheWorldSpecial: MultipleEndings version.
* EnemyChatter
* EnemyScan: [[MemeticMutation His vision is augmented.]]
* EverybodySmokes: Sort of. You won't actually see anyone smoke, but cigs are a common find throughout the game, and in many public areas, vending machines selling cigarettes can be found. You can smoke if you want, but it will cost you 10 points of health to the torso region, making a chain smoking session of 10 packs in a row, (assuming you are at full health in the torso) fatal.
** [[ImprovisedWeapon You can also kill people with cigarettes.]] [[http://www.youtube.com/watch?v=in8T0XTkSjw Smoke a ton in front of someone]] and it will kill them.
* EveryoneCallsHimBarkeep: Smuggler.
* EverythingIsOnline: Averted: One part of the game requires you get physical access to "Milnet". Additionally, at the ending [[spoiler: DeusEstMachina Helios has little power, at most able to change codes and turn off lights, but gets power because of willing followers]].
* EverythingIsTryingToKillYou: The final fight with Page is not a traditional boss fight so much as MalevolentArchitecture mixed with FlunkyBoss. On the three floors of the massive room in which he's being held, he's got swarms of repopulating minions (you can rush the nanoreplicators creating new creatures and turn their failsafes on, fortunately). He's also able to selectively blow up some of the computer banks and what-not where you travel to block your progress.
* EvilAllAlong: As with any good conspiracy-riddled, twist-laden plot, Deus Ex has quite a few characters who seem to be on the side of good (or at least order), but later are found to be working towards some nefarious purpose.
* EvilPhone: When JC arrives in Paris, answering one of the phones in an empty office will prompt a covnersation with Icarus, the evil AI of the game.
* ExactWords: [[spoiler: Daedalus was created by Majestic 12 to monitor all global communications in order to identify and eliminate terrorist groups, whom Majestic 12 (in their place as the power elite of the developed world) considered a threat to their power. Daedalus promptly ended up classifying Majestic 12 ''itself'' as a terrorist group due to their disregard for human life, and started using its considerable power and resources to oppose them.]]
* TheEyeOfArgon appears in a house you can break into at one point in the game.
* FailureIsTheOnlyOption: [[spoiler:You can never avoid being dragged to the [=MJ12=] base after you send the distress signal. Even if you manage to somehow avoid the battle in Battery Park when Gunther tries to pick you up, there are [[InvisibleWall invisible walls]] preventing you from reaching Jock's helicopter. Scrambling the brown robot behind Gunther shows [[HopelessBossFight that both are also invulnerable]].]]
** Depending on your values, you may find no truly happy endings to ''Deus Ex''. You can either [[spoiler:destroy global communications, throwing the world into disorder as government, banking, communication and transportation become irrevocably disorganized or you can rule the world either in secret as the Illuminati or openly as a omniscient AI.]]
* FallenStatesOfAmerica: The US is pretty much a third world country in the game. Homeless people are a common sight, and everything seems run-down. WordOfGod says to imagine the cities if their ghettos were the entire city rather than just a section.
* FantasticDrug: Zyme. In the unmodded game, it just blurs out your vision. In the Shifter mod, it gives you bullet time like perceptions with a blurred vision letdown after the slow down effects wear out.
* FemmeFatale: Maggie Chow.
* FictionalCounterpart
* FictionalDocument: ''Jacob's Shadow'', among others.
* FictionAsCoverUp: The conspiracy makes artificial life-forms called Grays that resemble the popular idea of aliens (round heads, gray skin) and is implied to let rumours about them circulate as a smokescreen for what they are really up to in the Area 51 facility.
* {{Foreshadowing}}: The plague victims in Battery Park and the Free Clinic. [[spoiler: The one in the clinic will claim the virus is man-made, which it is, and it's further theorized by the old soldier who claims microscopic warfare is the new thing. And the one in Battery Park will claim you have the disease in you, which is technically true, since the virus is actually a nanotechnological compound which destroys the body similar to an actual disease and uses the same foundation as your nano-modified body.]]
** The optional conversation with Morpheus basically foreshadows [[spoiler: the Helios Ending -- if you go for that ending.]]
** As mentioned in ArbitrarySkepticism above, [[spoiler: Jock foreshadows Area 51 where the climax takes place.]]
* FutureSpandex: Common throughout the series.
* GaiasLament: 2050s Earth is not doing so hot. Coastal flooding is common (you can see what are probably seawalls around Liberty Island), grizzly bears are extinct, the East River in New York is stated to have been rendered nearly lifeless due to a chlorine spill, and a suicide clinic, built because of "dwindling resources" is mentioned in an email. An in-game ad for clinic reads like a cheery supermarket advertisement -- heavily implying that has transcended the garden variety doctor-assisted suicides to becoming an entire sub-industry unto its own. Squicky.
** Los Angeles has been destroyed, and you find this out via one line of secondary dialog that you may not even see if you make certain choices. UCLA gets a mention in what was probably a recent newspaper article, though.
** This can be seen when you look at a few world maps. Southern California and the Baja California peninsula are nowhere to be seen.
** A book found in Paul's apartment reveals that India and Pakistan are ''gone'', having exchanged nuclear warheads.
* GameMod: A few, such as ''VideoGame/{{Zodiac}}'', ''Shifter'', ''Redsun2020'', ''TheNamelessMod'', ''[[VideoGame/TwentyTwentySeven 2027]]'', and the ''[[http://www.youtube.com/watch?v=-faAQIjbJZE Malkavian Mod]]''.
* GameplayAndStorySegregation: The endings seem to have been rendered before the last level was finalized. Characters ask things which they should already know; JC asks who and what Helios is; Bob Page asks what's happening even thought moments before he was begging JC not to overload the complex; JC asks the true identity of The Organization, even though previous radio messages have clearly referred to it as The Illuminati.
* GatelessGhetto: Actually a ''part of the backstory'', as New York has passed, and the Supreme Court [[AmericanPoliticalSystem upheld the Constitutionality of]] (despite the Justice being quoted mentioning nothing about the Constitution and merely saying freedom should be given up for security), laws allowing giant walls to be erected around high-crime areas.
* GeneticEngineeringIsTheNewNuke: Downplayed. While JC and Paul have been genetically engineered [[spoiler: as clones of [[VideoGame/DeusExHumanRevolution Adam Jensen]]]], it's so that their bodies can accept nanotechnology, which is the real innovation.
* GeniusBruiser: JC Denton, while possibly [[spoiler:and at least [[TykeBomb built to be]]]] a killing machine, at more than a few points, such as with the bartender in China and with Morpheus, is quite able to sit down and talk philosophy.
* GenreBusting
* GiveMeASword: Gunther asks for a weapon after being rescued in the first mission. Whether or not you give him one affects his attitude towards you in the earlier missions. Later in the game, Gilbert Renton also asks for a gun to take out the gangster Jojo Fine by himself and again, the decision to give him one or not has some (minor) effect on the plot.
** ''What you give him'' seems to make a lot of difference. Give him [[spoiler: a tranquilizer crossbow, so he can shoot Jojo once while you [[VideoGameCaringPotential stand in front of Gilbert to keep Jojo from killing him]]]]. Or give him [[spoiler: a pistol, in which case Jojo probably ''will'' [[VideoGameCrueltyPotential kill him]]]]. Or [[spoiler: kill Jojo yourself, in which case Gilbert's daughter loses all faith in his ability to protect her and their hotel, and [[NiceJobBreakingItHero she runs off]]. Of course, if you don't want the third option to occur, you can also assist him by tasing Jojo before he takes too much damage, and let Gilbert finish him off while he's running away.]]
* GlobalCurrency: Credits, otherwise known as "chits". Justified by globalization. Walton Simons does refer to JC's augmentations/training [[spoiler:and presumably the cloning process]] as "another fifty billion dollars down the drain" at one point. It is not clear if this is just a script error, JC was created before the currency change or Simons still thinks in terms of the old currency[[note]]It's quite common on countries that had such changes: in the Eurozone, for example older people still refer to prices in the old currency, [[FridgeBrilliance especially large amounts of money]][[[/note]].
* GoodAllAlong: Much as with EvilAllAlong, Deus Ex is full of characters who are played up as the next Hitler, only to be revealed as working towards a good purpose, or at least motivated by good intent.
* GoombaStomp: The most bizarre method of killing Howard Strong. But can technically work on anyone. Including animals. (In fact, you'll probably end up accidentally killing several animals by stepping on them.)
* GotTheWholeWorldInMyHand: The Majestic 12 symbol is a hand menacing over Earth's globe.
** For extra symbolism points, the logo seen on their computers has the globe represented by the same projection used in the UN flag.
* TheGreys (are real, but their existence as actual aliens is {{Jossed}} in universe.)
* GridInventory
* GunsInChurch: Certain area are a "weapons-free zone." Some of these areas will have a sign notifying the player. If you ignore this sign and walk in with a weapon out, unarmed [=NPCs=] will panic, and armed ones will attack you.
* HairTriggerExplosive: Tossing a crate of TNT any significant distance will cause it to explode.
* HealingFactor: One of the augments gives JC constant healing (implyingly from his nanites knitting his wounds from inside) when active, at the cost of Energy. See also CriticalExistenceFailure above.
* HealThyself: The player can be damaged in the head, torso, legs and arms. Fully damaged legs greatly limit your movement, damaged arms give accuracy penalties, while going down to 0 in the head or torso means death.
* HeKnowsAboutTimedHits: Jaime Reyes on the keyboard controls at the beginning of the training course.
* HelloInsertNameHere: At the start of the game the player is prompted to provide a real name for the protagonist, but he is ''always'' referred to in dialogue as JC Denton, which is apparently only his code name. Later, you'll find the chosen name used in a few emails and newspapers.
* HeroAntagonist: After [[spoiler: defecting from UNACTO, any UNATCO trooper, cop, or US soldier not part of the conspiracy or sadistic is this.]]
* HoistByHisOwnPetard: If you fully upgrade the Aggressive Defense System aug, enemies who try to kill you with explosives will have them go off as soon as they launch or throw them. It is quite possible for an enemy to kill themselves this way.
* HollywoodSilencer: Available weapon mod, that can be attached to almost everything. It doesn't change the weapon's appearance though.
* HopelessBossFight: Everything between escaping Ton hotel after betraying UNATCO and meeting Gunther and his group at Battery Park. The moment you die you will be imprisoned for plot advancement. And you can't avoid death because Gunther is immortal.
** If you manage to escape and sneak by Gunther your find a massive number of opponents and bots. Defeat those and you'll be trapped in your current area due to things being placed to block the exits out of the area your in. Build a pyramid of junk to allow yourself to climb over the walls and you'll still find that your pilot refuses to land and pick you up. But in all honesty to get to this point you've probably already cheated, done some save scumming, or abused the stealth game play and ArtificialStupidity to an absurd level.
* HostageForMacGuffin: Bob Page tried this, holding Tiffany Savage and demanding components for Universal Constructor. Instead JC Denton came and killed everyone (sans Tiffany if you were skilled enough).
* HumanPopsicle: Lucius [=DeBeers=]. He thinks he's still the head of the Illuminati, and if JC tells him he's only a figurehead now, Lucius requests JC euthanize him.
* HumanResources: CHOCULENT DREAM. IT'S CHOCOLATE! IT'S PEOPLE! IT'S BOTH!(tm) 85% recycled material.
* HyperactiveMetabolism: Eating chips and drinking soda heals you by a (very) small amount. [[JustifiedTrope Justified]] by the {{nanomachines}} in your body optimizing the chemical input and using them to encourage healing. Likewise, the effects of chemical intoxicants (alcohol, drugs, etc.) is quickly flushed from the system, compressing the effect to being [[InterfaceScrew very brief but very strong]].
* HyperspaceArsenal: While large items are limited by the [[GridInventory Inventory grid system]], JC sure has a lot of space in that coat to store the maximum amount of ammo.
* IfIWantedYouDead:
--> '''JC Denton''': If I'm gonna kill you, [[YouAreAlreadyDead you're already dead.]]
* ImprobableAimingSkills: you start the game barely able to hit the side of a barn, but as you gain skill in specific weapon classes, you gain accuracy with them. This would be perfectly OK, if it weren't that gaining skill also somehow causes the ''weapon itself'' to be more accurate. It becomes particularly ludicrous with shotguns; max out the rifle skills, and ''all'' the pellets from shotgun blasts will hit exactly in the centre of the crosshair, essentially giving you [[GameBreaker one-hit-kill sniper shotguns]].
* ImprovisedWeapon: The crowbar, any heavy object that you can pick up and drop on someone, fire extinguishers, and [[http://www.youtube.com/watch?v=in8T0XTkSjw cigarettes.]]
* InfantImmortality: If you so wish, you can avert this trope.
** Killing Louis Pan, for instance, gets you a WhatTheHellHero from Gordon Quick.
* InformedAbility: Engine limitations mean augmented enemies don't actually have proper augs, just always on abilities (which are generally limited to elemental resistances) and a cloak that has a scripted activation at low health, that mimic augs. Walton Simons, noticeably, does not have most of the augmentations he is described as having.
** More humorously Leo Golds [[http://images.wikia.com/deusex/en/images/f/fe/Leo_Mugshot.jpg file photo]] describes his hair as "None"... well there's some hair-like object perched upon his head.
* InsecurityCamera
* InstantExpert: Skills are learned on the spot when you put skill points into them, and their effects are immediate.
* InstantSedation: If you shoot someone in the face with a tranquilizer dart. It does, however, take several seconds to bring someone down, during which time they'll run around doing their level best to kill you and alert their buddies.
* InterfaceScrew: Getting shot with a tranquilizer dart, greasel venom, or taking zyme or alcohol will cause your screen to go blurry.
** The interface screwing effects ''stack'', so drinking every bottle of booze you find (in some areas that means fifty or more) will zoom your perspective to a tiny shifting tunnel, clouded by dark gray difference clouds.
* InvadedStatesOfAmerica: See Mexico Called down below.
* InvisibilityCloak: Available as an augmentation in one of two mutually exclusive flavors: the classic chamaleonic cloak for the naked eye, and an EMP dampener to make oneself indetectable to robots, turrets, cameras and other electronic devices. They require copious amounts of energy to keep them from breaking the game.
* JustAStupidAccent: The Hong Kong levels are particularly notorious for this. For the game's Chinese characters to speak saying things like "''Rucky Money''," and "''In the fresh''"?... (Hint. The Chinese language has the letter "L.") Also seen on the Paris levels with painfully thick French accents. Averted with the Chinese soldiers on the ship, though, who possibly through an oversight, speak perfect American-accented English. Plot point if you miss [[spoiler:the mechanic in Everett's home]], who has an incorrect accent.
* JustifiedTutorial: JC is finishing his training before starting work at UNATCO.
* KatanasAreJustBetter: In this universe where people can pay to have the ability to level a building and reduce an entire town full of people to mush by just ''thinking'' at them, or can carry enough firepower to make the US Army blush, the strongest weapon in the game is a sword.
* KleptomaniacHero:
** In most places, the worst you get is a "Hey, what are you doing?!"
** Deconstructed in Paris when [[spoiler:Icarus contacts JC via infolink while he is breaking and entering people's houses and implores, in a very deadpan manner, the player to consider his motivations for violating "arbitrary laws" and to not miss the chance to join a new world order]].
** Police will attack you if they catch you picking locks, and in some places, picking lots will cause unarmed [=NPCs=] to panic, and armed ones to attack you.
* KnowledgeBroker: The Oracle, which is a reference to the Usenet Oracle. The oracle sends out three emails to other characters, providing and requesting information (even if the information is otherwise mundane.)
* LaserHallway: Red lasers sound alarms, blue ones do something else, like activate security bots. Gold lasers cause damage or instant death.
* LethalJokeItem: Most players write off the assault rifle due to dealing a whopping 3 damage, far less than even the stealth pistol. The catch is that [[BoomHeadshot headshots]] do considerable damage, so with a higher rifle skill level and some recoil mods, an on-target burst to the head can kill EliteMooks that might shrug off a headshot from the pistol or crossbow.
* LightningBruiser: [[SuperSpeed Speed aug]] + [[SuperStrength Combat Strength aug]] + [[BulletProofVest Ballistic Protecion aug]] + [[AbsurdlySharpBlade Dragon's Tooth Sword]] = Lightning Bruiser JC.
* LoadsAndLoadsOfLoading: The console version gets bogged down with this, mainly due to memory limitations of the [=PS2=] which forced changes to the level design which breaks them into smaller, more frequently loaded areas.
* MadeOfExplodium: Most of the more powerful enemies really are filled with explosives and explode into violent gibs when dead.
* MagikarpPower: Most of the weapons and augs you start out with tend to be pretty weak, but if you upgrade them along with your skills, they tend to become a GameBreaker.
* MathematiciansAnswer: If you confront Morgan Everett about [[spoiler: Lucius [=DeBeers'=] potential restoration from cryostasis]], he will give a not-so-straight answer:
--> The technology has been around for decades, but he does not need to know that.
** Whatever he means by that is left for the player to decide, but judging from his point of view [[spoiler: it doesn't sound like Everett is intent on reviving him.]]
* MatrixRainingCode: This is a "May Tricks Mode" cheat in the game. Plus, it is visible in the background of the hacking-time meter.
* MeaningfulName: [[spoiler: There's an e-mail in that game that says the Denton clones are named after the apostles. If JC is the pinnacle of the project...]]
* TheMenInBlack: As EliteMooks. As befits the game, JC is a scary black/blue-clad government spook, and Men in Even Blacker try to outspook him. There's also a few Women in Black.
* MercyKill: If you tell [=DeBeers=] that Everett has no intentions of healing him, he will command you to do this to him.
* MexicoCalledTheyWantTexasBack: In the backstory, [[AllThereInTheManual only mentioned via in-game media]]. The original NSF showed Mexico how weak the US has become; Mexico attempts to reclaim Texas.
** Silhouette allegedly C4'ed the Statue of Liberty because they felt France was wrong to give her to us. [[spoiler: It's implied Majestic 12 did it to pin the blame on them.]]
* MissileLockOn: GEP (Guided Explosive Projectile) Gun. The time improves if you become more skilled in heavy weapons.
* MissionControl: The security for JC's "infolink" apparently has more holes than Swiss cheese, as almost everyone in the game is able to send him a message. Usually the people talking to him are connected to UNATCO, so it makes sense that they have access, but even people he's never seen before, such as Everett, can give him a call.
** Alex Jacobson, a UNATCO-trained communications engineer, [[spoiler:tags along to the locations JC goes to. He shows up at Tracer Tong's and Morgan Everett's respective places, thereby giving them access to the infolink.]]
* MohsScaleOfScienceFictionHardness: Deus Ex is on the harder end of the scale, with only the [[spoiler:universal constructors in the end game]] and [[WritersCannotDoMath super sonic black helicopters]] tilting to implausible.
* MoneyForNothing: There are precious few places in the game world to spend your credits, and none whatsoever after about the two-thirds mark.
* MookMaker: [[spoiler:Area 51's inner depths have a few Universal Constructor outlet chambers that constantly generate enemies to throw at you, such as Greys. You have to find a switch to seal the rooms off to stop the reinforcements from coming in.]]
* MsFanservice: Anna Navarre, if you're into domineering bionic women dressed in dominatrix gear.
** Also, a couple of locations feature "Women in Black" - sexy women wearing sunglasses and wearing business attire. That some of them carry swords adds to the appeal.
* MultipleEndings: Three distinct endings, [[BittersweetEnding each with their ups and downs.]]
** [[spoiler:Merge with HELIOS and use its power to [[ThePhilosopherKing rule over the world as a benevolent dictator.]]]]
** [[spoiler:Destroy Area 51 and shut down communications worldwide, [[LibertyOverProsperity allowing the world to run itself.]]]]
** [[spoiler:Kill Bob Page and work with Morgan Everett to [[BenevolentConspiracy use the Illuminati to improve the world.]]]]
* {{Nanotechnology}}: Augments a human by truly merging man and machine, unlike the patchwork of mech-augs where meat and metal are still distinct from each other. Gets into some philosophical ramifications of using it to augment a human beyond what it's naturally capable of.
* NeverBringAKnifeToAGunFight: [[spoiler:Maggie Chow]] will show up at the [[spoiler:[=MJ12=] lab]], scorn you and then [[CallingYourAttacks state hostilities]], nanosword in hand. You will likely get to shoot first. Some Women in Black are also seen with the nanosword as a weapon of choice, but since they are augmented they can soak up more damage and thus are much more dangerous.
* NintendoHard: Even on Easy, it's not always practical or even feasible to be a straight up FPS hero all the time, and Realistic difficult makes this a rather insane option at the best of times. Towards the end of the game it becomes possible to run and gun successfully: with the proper augmentations JC is all but invulnerable.
* NoCommunitiesWereHarmed: The [=NSF=]'s first big stand is said to have happened in the Pacific Northwest, at the "Battle of Squalnomie". Squalnomie is not a real place, but ''Snoqualmie'' is the name of a city and several geographic regions east of UsefulNotes/{{Seattle}}.
* NoGearLevel: After you get captured by UNATCO in New York. You can get your weapons back. Strangely though, they don't take your ammo.
* NonCombatEXP: Exploring nooks and crannies of the various maps not only nets you more inventory, some additional lore and bonus scenes, but every so often also gives you "Exploration Bonuses" in EXP.
* NonFatalExplosions: Averted; most explosives have a surprisingly large (for games) blast radius and direct hits will kill you and even boss enemies. Even with upgrades you can only detonate them remotely before they reach you, not survive actual hits.
* Not-So-SubliminalSeduction: In the Hong Kong [=VersaLife=] offices, over the programmers' heads are message boards that continually flash one-word messages such as "OBEY", "TRUST", and "LOYALTY".
* OnlyAFleshWound; JC and other characters. Even basic NSF mooks can ignore a headshot (from the Stealth Pistol), without any noticeable concussion, and can shrug off pepper spray in a few seconds, where it would be a game breaker in real life. They are wearing gas masks, though since they're coughing and are stunned [[RuleOfFun enough of it is clearly getting through to their lungs]]--
* OppressiveStatesOfAmerica: As the US fell to shit, and as the cabals in the background tightened their grip, the US government became more and more tyrannical, resulting in the rise of the [=NSF=].
* OptionalStealth: Stealth is possible. While certain {{NPC}}s will react positively or negatively based on whether you primarily use lethal or nonlethal force, it usually doesn't matter if you take a stealthy approach or not (although playing stealthily makes nonlethal runs easier for obvious reasons).
** However, there's a mission near the end where you have to rescue a scientist's daughter from the Majestic-12, in which getting caught results in an {{MIB}} killing her, causing you to fail the mission and miss out on a reward. It is still possible to complete the game, though.
* OxygenMeter
* PacifistRun: You can come pretty close. You "need" to kill two, [[spoiler:three for the Illuminati ending, as you will have to blow up Bob Page.]] As for the other two people; one can be bypassed via an AI glitch; the other tends to suicide with [[spoiler: his own grenade]] (and can be knocked out).
** Strongly encouraged at the beginning of the game (two characters encourage you to sneak or to use as little force as possible). But ... [[spoiler: one of them either becomes or has already become TheMole, and is thus preemptively protecting his new friends from ''you'', and the other one joins you when ''you'' leave your old organization as well]]. By the end of the game, you have very little external encouragement towards subtlety whatsoever, though you can acquire many artificial sneaking aids.
** Extremely inverted at the end of the game, however: in the second-to-last level you have to [[spoiler:launch a nuclear missile at an active US Army base]], while at the end of the game, [[spoiler:you can destroy whatever remains with an antimatter explosion, bringing down all global communication systems around the world]].
* PamphletShelf: The book excerpts the player can read, such as of ''TheManWhoWasThursday'' or the fictional ''Jacob's Shadow''. Er--the fictional fiction ''Jacob's Shadow''.
* ThePasswordIsAlwaysSwordfish:
** You'd think that Maggie Chow would know that making your birthday your password is a bad idea. Also, Chow's computer passwords are the names of her favorite novels.
** Majestic 12 is not immune to this either. Just take a wild guess what the passcode is if you ever encounter a keypad in a [=MJ12=] compound and have to enter a code of 2 numbers. [[TooDumbtoLive Facepalm]]
** Of course the real problem is that people leave their passwords lying around. The number of times you'll find a datapad that was sent out to tell people that "the password is still: something" is really incredible.
** In the naval base level, there is a 7-digit keypad. On a lark, you may be inclined, just for the heck of it, to enter "8675309". Lo and behold, it's valid.
** The password for [[spoiler:accessing Helios]] is "panopticon", a term for a prison where the wardens have a clear view of every prisoner. Which is rather fitting for [[spoiler:an AI originally designed to monitor criminals.]]
** In the game's engine, the default username and password for any locked computer is [=USER/USER=]. A large number of computers in the game still use this combination; most have very little or literally nothing on them, but a small number hold access codes, control buttons, or other such things.
* PoweredArmor: The MJ-12 Obsidian power armor used by [[EliteMooks MJ12 Commandos]].
* PowerUpgradingDeformation: The cyborgs made before the protagonist, which annoys them to no end.
* ProductPlacement: Parodied for the soda can description.
-->The can is blank except for the phrase 'PRODUCT PLACEMENT HERE.' It is unclear whether this is a name or an invitation.
* ProperlyParanoid: Killing [[spoiler: Joe Green before being asked to, or the gatekeeper at the graveyard will elicit this response from characters.]] Some [=NPCs=] will come up with what would in normally be dismissed as paranoid conspiracy theories in real life, but in the universe of ''Deus Ex'', they are just about spot on.
* ProphecyTwist: Aquinas spoke of the mythical city on the hills...
* PunchClockVillain: Most [[spoiler: UNATCO employees]] are unaware that their agency is corrupt to boot.
* PunchPackingPistol: Among the most famous in gaming. It applies to both yourself and your enemies, especially on the harder difficulties, where an enemy can kill you in a single shot if you aren't lucky. Interestingly, the more trained mooks carry assault rifles, which are incapable of this, but the militia fighters carry pistols, which given the game's physics, arguably make them dangerous to the player.
* RangedEmergencyWeapon: A small plasma projector, the size of a cigarette lighter. Can only be fired once, can only carry one.
** The game describes the [=PS20=] as a ''self-defense weapon''. The comparison is obviously to the two-shot .45 Derringer of old, but the fact remains that the [=PS20=] is a ''plasma weapon'', and one-shot or not, it goes ''way'' beyond self-defense.
* RealityHasNoSubtitles:
** One of the locations in the game is HongKong. Most people you meet there speak English, though there is a monk that speaks Cantonese with no translation given. ("Please give way" and [[LampshadeHanging "Can you speak Cantonese?"]]) There is some Chinese text, unfortunately most of it is [[GratuitousForeignLanguage complete nonsense copy-and-pasted repeatedly]].
** There's also some untranslated French lines in {{Paris}}.
* ResearchInc: Versalife
* RenegadeSplinterFaction:
** [[spoiler: Majestic 12 to the Illuminati]].
** [[spoiler: X-51 to Majestic 12]].
* RidiculousFutureSequelisation: NetHack v54.3.1 with v54.3.3 coming out next week. Especially ridiculous in that NetHack last versioned in 2003.
* RightWingMilitiaFanatic: The original NSF were this, but at the time of Deus Ex, membership has spread from just secessionist fanatics to anyone oppressed by the current political and economic system, which, in turn, has given their policies a more leftist slant. They are no less fanatical, however, and they're mostly ''right''.
* RoarBeforeBeating: Karkians.
* RunDontWalk: Menu option. It's an ''option'' because moving at all, but running especially, always heavily hinders your aim.
* SelfDestructMechanism: The [=MechAugs=] are programmed with a Kill Phrase that literally makes them self-destruct, ostensibly in the event that they go rogue. Later on, you find out [=NanoAugs=] have a much less explosive killswitch mechanism installed that results in a slow death, [[spoiler: when Simons activates the one in Paul as revenge for the Dentons' defection.]] Dead Mech-Augs and [[TheMenInBlack Men in Black]] also explode in a rain of gibs.
* SelfImposedChallenge: Several other than PacifistRun are possible, but the real cake-taker is the [[http://qntm.org/alginon Alginon Run]]. No items, no money, no augmentations, no skills. Realistic (hardest) difficulty setting. It involves a ''lot'' of sneaking and running away.
* SequelHook: The cloning tanks at the very end of the game include [[spoiler: a clone of JC himself]]. In a CallForward, a nearby computer screen even gives their name as Alex.
* SequenceBreaking: When returning to Paul's apartment, the attacking Men in Black troopers are triggered by entering conversation with Paul. Savvy players can lace the hallway with proximity mines before triggering the sequence. They barely get two words out before being blown to hell.
** Similarly, killing Maggie Chow, or [[http://www.colinfahey.com/deus_ex_mr_manderley_and_me/deus_ex_mr_manderley_and_me_en.html knocking her unconscious and throwing out the window of her apartment building]], significantly [[spoiler:impairs her ability to confront you later in the Versa-Life complex]].
* ShinyNewAustralia: Averted, the BigBad offers you Europe to stay out of his way instead.
* ShipperOnDeck: If you took the main entrance to Battery Park on your first visit, the UNATCO troop to the right of the main door of UNATCO (going in, left when leaving) will say that he thinks that you and Agent Navarre would make a nice couple.
* ShopliftAndDie: Stealing from the shops in Hong Kong is met with an armed response. Stealing is also punished in Paris; there are many completely optional locations in Paris that are people's living quarters. If you are caught breaking into them, the Parisian police go after you. One house will have the owner attack you after you attempt to talk to him a few times.
* ShoutOut: Many.
** Tracer Tong's speech in the sewers about halfway through the game--it's lifted almost word for word from ''{{Illuminatus}}''.
** For that matter, Tracer Tong himself, or rather his login. To the uninitiated, "[=TracerT=]" looks like a reversal of many corporate or academic networks' login naming convention of "first initial, full last name" (such a system is frequently used in game). Anyone with a background in computer networking will be able to tell you that "tracert" is the win32 command to invoke the IP traceroute tool, which tracks the progress of a data packet from source to destination. And Tong is just the kind of wiseass who would create a login like that for himself.
** Paul rents two movies: ''[[http://en.wikipedia.org/wiki/See_You_Next_Wednesday See You Next Wednesday]]'' and ''[[StarWars Blue Harvest]]''.
** There's also an e-memo in the Majestic-12 sewer base from a [[WesternAnimation/BatmanTheAnimatedSeries Dr. Harleen Quinzel]].
** One of the songs in the soundtrack (by Creator/AlexanderBrandon) is titled "Mission Eight" ([[IHaveManyNames among other names]]) and is similar in name and in style (at least in the beginning) to "Mechanism Eight" (by Necros) from ''VideoGame/UnrealTournament'', the soundtrack of which was also composed mostly by Brandon.
** One apartment in Paris feature the characters from ''The Story of O''.
** Whenever a random name appears in in-game text, it's likely to be a reference to something. The people in the Hilton hotel register are all from novels (plus one comic book character). The list of people in the annals of the Luminous Path are all characters from martial arts movies or Chinese actors. [[http://nuwen.net/dx.html This page]] has an extensive list of references.
** There is an advertisement of the euthanasia company (see below) named [[http://en.wikipedia.org/wiki/Jack_Kevorkian KVORK Inc.]].
** A simple little keypad in the Naval Base level has a daunting seven digits, inclining you to just simply take your multitool to it. Until you get this impulse to type in "8675309".
** A newspaper on the ground in the warehouse mission (near the wall-mounted LAM) is a reference to the Literature/SherlockHolmes NoodleIncident, the [[RodentsOfUnusualSize Giant Rat of Sumatra]].
** The Stealth Pistol is a [[GhostInTheShell Seburo Compact eXploder]].
** One of the Paris apartments features a passage from TheEyeOfArgon!
** You'll find numerous references in emails and datacubes to a NSF agent named Decker. [[Film/BladeRunner Add a "d" to the end....]]
*** In ''VideoGame/DeusExHumanRevolution'', a computer in the Detroit police station is owned by a RDECKARD.
** Look carefully at the pinball table...the playfield is clearly ''[[http://www.ipdb.org/showpic.pl?id=311&picno=301 Black Knight 2000]]''! Too bad it doesn't play [[http://www.youtube.com/watch?v=fCKDvjVzpNQ the AWESOME music.]]
** At Versalife, you can find an email from [[CreatorCameo Austin Grossman]] to WilliamGibson bragging he finally beat ''NetHack''.
--->I managed to nail Nethack v54.3.1 just a few minutes ago. Made it past the Astral Plane, and _then_ back in time to work through all of history up to Nethack v3.2.3 (this, of course, has been in every version since 48.2), but after that the game jumped a thousand years into the future and I had to build an entire interstellar trading alliance (with only the Amulet of Yendor) before the aliens from the other side of the black holes showed up...took me six months to solve that part of the game, and then I finally won. Check it out: www.nethack.org. I hear v54.3.3 should be out next week.
** The disease, Grey Death, is named for a character in an obscure anime OAV.
** The password to get into Smuggler's den, "bloodshot," is a reference to a nano-technologically augmented superhero published by Valiant Comics in the 90s.
** In Area 51, you find a list of scientists killed during the MJ12 attack; one of the scientists bears the last name "Alibek", like [[http://en.wikipedia.org/wiki/Ken_Alibek Ken Alibek]], a defected scientist who worked on bio-weapons for the Soviet Union.
** Some mods get in on the fun, too. With Shifter installed you can also read a message from [[Film/FightClub Project Mayhem]] the first time you go into the bar in Hell's Kitchen.
* ShownTheirWork: With ConspiracyTheories in general. For Example: EnemyChatter in one level has an "Informed Guard" telling a "New Guard" the various Executive Orders that give FEMA the power to do what it's doing, assuring him that it's all legal. Said Executive Orders are cited by conspiracy nuts to mean these things.
-->'''Informed Guard''': "Executive Order 10990. It lets us take over all modes of transportation."
-->'''New Guard''': "FEMA can do that?"
-->'''Informed Guard''': "If the President declares an emergency. Executive Order 10995. We can take over the media."
-->'''New Guard''': "All of it?"
-->'''Informed Guard''': "Any at all. Executive Order 10997. We can take command of natural resources."
-->'''New Guard''': "So it's all legal."
-->'''Informed Guard''': "The National Security Act also falls under our umbrella. And the Defense Production Act. If he plays his cards right, Walton Simons can pull off a bloodless coup."
-->'''New Guard''': "All the better. Then we don't have to fight."
-->'''Informed Guard''': "Exactly."
* SniperPistol: You can make one if you add a scope to a pistol. You'll never see the actual scope in-game though.
* SniperRifle
* SniperScopeSway: This happens, but leveling up your rifle skill results in the scope swaying less, with the crosshairs perfectly steady at the highest level. Rather than sway related to breath, the crosshairs do a random walk.
* SomebodySetUpUsTheBomb: "[[http://www.youtube.com/watch?v=tOKt1z1TkvU A bomb!]]"
* SpiritualSuccessor: To ''SystemShock''. There are also many similarities between the game and ''VideoGame/{{KGB}}''.
* SpoilerOpening: The opening cinematic not only identifies the BigBad and TheDragon and their current spheres of influence, but also that a certain woman in a dragon dress is affiliated with them, UNATCO has a puppet leader in place and the conspirators are investing in, amongst other things, an electronic sentience. The developers seemingly realised they were invoking this trope, as the intro for the later-released PS2 version of the game cuts out all of the spoilers mentioned except for the Big Bad and Dragon's identities.
* StandardFPSEnemies:
** [[TheGoomba Grunts]]: [=NSF=] terrorists. They have poorer aim and less health than normal soldiers, and are armed only with pistols, sawed-off shotguns, or mini-crossbows (granted, in this game pistols ''really hurt''; in the hardest difficulties, you can be one-shot killed with one, even at full health, while assault rifles do noticeably less damage than in most other games.)
** Soldiers: Most human opponents in the game, but the most prominent are [=MJ12=] Troopers and [=UNATCO=] soldiers.
** Snipers: Any soldier armed with a sniper rifle, but since they use the same A.I. as every other human opponent, they're apt to end up trying to Rambo you at medium range.
** [[EliteMooks Elites]]: [=MJ12=] Commandoes and Men in Black. Commandoes wear an insulated suit of light PoweredArmor equipped with twin chainguns that do ''much'' more damage than any other automatic weapon in the game, while Men in Black have more than 3 times as much health as a standard Mook, come equipped with full-auto shotguns or dragon tooth swords, and ''explode'' when they die, potentially killing you if you're at melee range.
** [[GiantMook Heavies]]: The light and medium security bots fulfill this role, equipped with a machine gun and being heavily armored against ballistic ordinance and requiring either armor-piercing rounds or explosives to kill. This is balanced out by their relatively slow walk speed.
** [[HumongousMecha Walking Tanks]]: The heavy security bots are very tough, and only appear a handful of times throughout the game.
** Zombies: Karkians pretty much just charge at you and try to bite you. Greasels and Greys have a ranged attack in addition to their melee attack, but aren't much brighter.
* StatOVision: One of the two possible vision upgrades; this module shows where enemies are damaged and what weapons they're carrying. Using it also increases the damage you do by default; however, a lot of people pass over this upgrade for the other one, which lets you see enemies in the dark, ''through walls.''
* StealthBasedGame: One way to play the game. [[ButThouMust Most of the time]].
* StoryDrivenInvulnerability: You can kill certain characters but not others. For example, [[ButThouMust you can't "choose" to carry out your orders to kill Paul]] because... he's a "vital" character in the storyline, so your bullets won't harm him. Paul ''can'' die, however, if you leave through the window of his apartment while he's fighting baddies.
* SubSystemDamage: The player (and everyone else, for that matter) are divided into six damage zones. Hitting different parts confers different damage multipliers, and losing any has a negative effect on the character's ability to function properly. Losing legs inhibits movement, and arms will hindering aiming. If you lose all health in head or torso equals death.
* SuicidalOverconfidence:
** A terrorist with a knife will happily engage a security bot powerful enough to take down a hundred punks like him at the same time.
** [[spoiler:After JC unravels her schemes, Maggie Chow (if not dead) will try to kill him in the UC building.]] While the character in question is supposed to be good in unarmed and weapon martial arts (and wielding a nano-tech sword), JC (their target) is a highly trained government SuperSoldier, and (most likely) armed to the teeth with various high tech weapons.
* SunglassesAtNight: Directly [[LampshadeHanging lampshaded]] by early-game partner Anna Navarre, who mocks JC for it. He gruffly replies that his [[MemeticMutation vision is augmented]]. The real reason is that he has [[UhOhEyes solid, softly glowing blue eyes]], and uses the sunglasses to hide them from others.
** A number of other characters do the same, although strangely, your brother Paul, who has exactly the same issue with his eyes, doesn't.
*** Gunther will remark it's a good way to tell the difference between Paul and J.C.
* TaintedVeins: Walton Simons looks like a right freak with the 'bioelectrics' marking his face. JC {{Lampshades}} this in one of his snarky moments.
** An easily missed background conversation between him and resident UNATCO chief doctor Jaime Reyes has Simons complain about constant headaches, caused by his fixation on keeping his bioelectric reserves maxed out always. This could likely be the cause of his face veins as well.
* TalkingIsAFreeAction: Dialogue happens in realtime, but can be fast-forwarded and is not interrupted by combat, with hostiles politely waiting to attack.
* TalkingTheMonsterToDeath: Most straight example possibly. Anna and Gunter will die if you say right words to them.
* TechnicalPacifist: JC himself ''can'' qualify, but the more obvious example is his brother Paul, who will extol the virtues of non-lethal takedowns while still being programmed to annihilate any enemies he spots with a plasma rifle.
** By skirting around him on the dock, you can lead Paul on a homicidal rampage across Liberty Island. While chasing you down to deliver his lecture on the virtues of nonlethal force, he will happily [[HypocriticalHumor gun down every NSF troop who gets in his way]]. Which becomes doubly hilarious when you take into account the fact that [[spoiler:Paul is himself a member of the NSF.]] This is more of a case of GoodBadBugs, as the developers didn't intend for Paul to ever leave the dock during the mission, but it is still funny nevertheless.
* TechnoWreckage: The Ocean Lab.
* ThisIsUnforgivable: Explicitly stated by Gunther when he finds out [[spoiler: you killed Anna Navarre]].
* ToHellAndBack: Mentioned in Jacob's Shadow.
-->'''Allie:''' Lot a people say this city looks like Hell.
-->'''Jacob:''' Most people never been to Hell.
-->'''Allie:''' And I suppose you have?
* TooAwesomeToUse: For some, the GEP gun. The basic pistol or stealth pistol can fall into this in the endgame, as by this point it is highly modded and is fast and accurate enough to kill most foes with two or three well placed headshots, but the supply of 10mm ammo drops off quickly late in the game.
** HE 20mm grenades for the assault rifle are even more rare and powerful than GEP rockets.
** The [=PS20=], a pocket plasma powered derringer pistol which carries only one shot and which, despite its size, the player can only carry one of at a time. By the time the player might think about using it, he will be already be fighting PowerArmor Mooks and mechs armored against energy attacks, shrugging off the one shot it delivers like pistol rounds.
* TranquillizerDart: Subverted in. JC's mini-crossbow can be loaded with Tranquilizer Darts which take several seconds to subdue the target. And, furthering the subversion, the victim runs around yelling for help before falling unconscious. Though shooting them in the head plays it straight, earning you an instant knock-out.
* TranslationConvention: [[GameplayAndStorySegregation JC is actually speaking French with the Parisians.]]
* TwoShotsFromBehindTheBar: The bartender has a sawed-off shotgun behind the counter. However, she also carries her own.
* UnitedNationsIsASuperPower: The UN is very powerful by the 2050s, and holds sway over the politics of nations. China left it sometime before the game, and is arguably better off for it.
** The justification is shown in ''Human Revolution'': the United States was on the brink of economic and social collapse in 2027, and things did not improve. The UN was already stepping in to shape world policy back then, and has grown more powerful in the intervening years [[spoiler: thanks to the Illuminati/Majestic 12 machinations]].
* UnusuallyUninterestingSight: Most of the time, no one will blink if you plop a dead body in front of them.
** Curiously, the general NPC AI code has an option to either freak out or get angry whenever a dead body is seen, but both options are rarely used except on hostile [=NPCs=]. Whether it was a deliberate decision not to set the option on general civilian [=NPCs=] is unknown.
* UpgradeArtifact: The upgrade canisters.
* VengefulVendingMachine: Early in the game, you overhear Gunther Hermann grumbling to Anna Navarre. The vending machines gives him the wrong soda so often he believes there is a conspiracy against him.
* VerbalTic: Helios, ''Y-e-e-e-e-s-s-s.''
* VideoGameCaringPotential: Half of the UNATCO troopers are named and occasionally strike a conversation with JC. This means there's a high chance that later, when they want you dead, you'll be doing an almost-PacifistRun trying to not harm any of the old buddies.
** The option to save Miguel from the Secret MJ12 base.
* VideoGameCrueltyPotential: Shooting a {{Mook}} in the legs, tranq'ing him several times and watching him run away as his partner looks on in disbelief is on the ''low end'' of the scale in terms of brutality. In fact, the game takes on a decidedly different tone (with various characters admonishing you for your actions) if you decide to kill plot-sensitive characters or NPC's before you're asked to. Better yet, you can:
** [[KillItWithFire Light people on fire with a flamethrower]], and [[ManOnFire watch them run around in pain until they drop dead]]. Alternatively, you can blow them into LudicrousGibs.
** Sucker invulnerable characters (like Gunther in the opening mission at Liberty Island) into attempting to destroy the turrets at the front of the Statue of Liberty, and watch the carnage (and copious amounts of blood) that result.
** Drop unconscious or dead bodies off high buildings, or simply slash at them until they ''explode''.
** Freak civilians out by shooting near them.
** Withhold food from a homeless child in Battery Park, then chase after him, guns a-blazing. Or better yet, give him a candy bar for the code to the nearby keypad, [[ArsonMurderAndJaywalking then kill him to get your candy bar back.]]
** Lob grenades into a market in Hong Kong and watch the local vendors attempt to escape their booths before they go off.
** You can give Gilbert Renton a gun, let him kill Jojo, watch as his daughter Sandra leaves home after admonishing him and then kill Gilbert right after she leaves. Then, you can find her near the end of the game huddling around a fire with other homeless people, let her tell you her story about being robbed and left penniless, ''then'' kill her and her homeless buddies. Now that's taking cruelty to a new level.
* WeAllLiveInAmerica: For some reason a wanted bulletin in France uses feet to describe the person's height. Maybe it's an extension of TranslationConvention.
* WelcomeToCorneria: There is a sizable pool of lines for background [=NPCs=] throughout the whole game, but they will eventually run out if talking to the same person enough times.
* WeWillHaveEuthanasiaInTheFuture: An email you read on Paul's computer mentions a suicide clinic that pays its customers' families 10,000 credits if they use it.
* WhatTheHellHero:
** Paul will let you have it if you go on killing sprees, and ''especially'' if you kill NSF leaders.
** Alex will chew you out if end up getting the hostages killed in the train station, kill or knock out Leo Gold after he surrenders, or if you [[spoiler: kill Anna on the 747, although he'll be more shocked than angry, considering Anna's reputation.]]
** Everett will call you out if you [[spoiler: euthanize [=DeBeers=]. Strangely enough, he immediately forgives JC for euthanizing century-old Illuminati leader responsible for JFK's death among other things.]]
** Depending on conversation choices in the Underworld Bar, Jordan will call you out on drinking on the job if you are buying drinks.
* WhatTheHellPlayer: A number of actions, throwing potted plants at people, going to the womens' bathroom, shooting the journalist in Underworld Bar, or killing the NSF leader after he's surrendered will provoke this kind of response.
** Can be a bit jarring at some points. You can hop on people's computers, even those filled with sensitive emails, log in (or worse, hack into them) and mess around, and the most you will get is a dirty look and some harsh words. In some areas however, the consequences of this action are played more realistically. Police in Paris will become hostile if they see you trying to break into buildings, and in the [=VersaLife=] labs, scientists will call security if they see you trying to break open locked cabinets.
* WhoShotJFK: The conversation with [=DeBeers=] implies that he instructed the Illuminati to kill JFK, as well as RFK.
* WideEyedIdealist: Some of JC's dialog indicates him as this. He appears to a firm believer that the US government, for all of its flaws, still works. Especially notable is that he continues to believe this even after [[spoiler: UNATCO is revealed to be heavily involved in a conspiracy.]]
* WholePlotReference: In ''Literature/Neuromancer'', the main character is hired to destroy the barrier between two Artificial Intelligences, resulting in an incredibly powerful AI when they merge. The same thing eventually happens here, too.
* WorldHalfFull: All three possible endings are improvements in comparison with current situation: [[spoiler:You can return power to Illuminati (More benevolent conspiracy, which will allow you to distribute food and vaccine for gray death), rule the world as an omniscient and benevolent AI, which lack emotions and ambitions, or take down communication, ensuring no one will be able to achieve global domination]]
* WritersCannotDoMath: In game text gives multiple conflicting clues as to the date the game takes place, some sources being off from others by as much as two years.
* YouALLLookFamiliar: Despite the fair amount of model diversity, the facial textures are virtually universally used, having some weird effects... Such as making the 23 year old JC Denton look 45.
** "[[http://www.youtube.com/watch?v=6j8jMn2Kcgs ... And everyone looks]] [[Creator/BenCroshaw the same...]]"
* YouBastard: Many of the Mooks will have conversations when not fighting the player, giving them more of a human side to them. Also, in a café in Paris, you can meet the parents of a [=MJ12=] trooper. The father will be a bit accepting about his son's potential death at the hands of the player, seeing what he and the rest of [=MJ12=] are doing, whereas the mother will beg you not to kill him. What is implied in just about everything Icarus says to you over the infolink after you do something that he considers unseemly. The comments are directed at JC, whose entire characterization is driven by the player, thus the comments are really directed at the player.
* {{Zeerust}}: This is truly thrown into sharp relief when compared with ''[[VideoGame/DeusExHumanRevolution Human Revolution]]'s'' more advanced looks. See CosmeticallyAdvancedPrequel.
** WordOfGod is that [=DX=] takes place in slummy and run down areas, where as [=HR=] has you seeing nice and richer areas, which would have much better tech and aesthetics.
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