Treacherous Quest-Giver

A common Plot Twist found in Role Playing Games and Video Games, but also found in Adventure, Action, or anything that loosely resembles Hero's Journey. When the Quest Giver directly tries to deceive the PC/Hero for their own hidden purposes. They have managed to disguise their Evil Plan as the Call to Adventure. Upon finding out, The Hero must either change their goals, or simply go though with the evil-killing procedure that was so generously to mapped out for them in the first place.

These Blatant Lies are usually quite obvious to most Genre Savvy players, but playing the Unwitting Pawn is usually necessary to keep the plot moving. Demands for Darker and Edgier and Silly Rabbit, Idealism Is for Kids over the past few decades have also made this rather routine. Nearly an Omnipresent Trope in RPGs with multiple quest lines, if only because out of so many people bossing the player around, one of them ought to be lying.

A Treacherous Quest-Giver may be:
 * The Mole
 * The Big Bad in disguise
 * An Evil Chancellor
 * The Starscream using the heroes to stage a coup
 * A Knight Templar who wants to use the Artifact of Doom or the Unholy Holy Sword to usher in a new age of Light Is Not Good
 * A True Neutral character who believes The Hero must be screwed over for the greater harmony
 * Someone who is being coerced, as even someone slick enough to fool the hero isn't above being persuaded by brute force
 * The Quisling
 * A Mysterious Backer
 * Most can overlap with Treacherous Advisor

NPCs qualifying for this trope must have a vital part in both sending the heroes on their quest and, intentionally, instigating the final conflict of the plot / quest line, even if they have outlived their usefulness and die long before said conflict takes place. This also has to do with disguising one's own identity or intentions from the beginning, from the hero if not also the audience. Having some Obviously Evil huckster pop up in the third dungeon and telling a Red Shirt to open the Sealed Evil in a Can because there's yummy cheesecake inside most likely does not count. For the cases when the guilty party tries to divert suspicions by initiating an investigation expected to fail, see Detective Patsy.

This is generally considered a plot twist and often a Twist Ending, therefore spoilers may be unmarked

Often overlaps with Xanatos Gambit, Batman Gambit, Bitch in Sheep's Clothing, The Cake Is a Lie, MacGuffin Delivery Service, and, clearly, requires an Unwitting Pawn, or someone who acts like one to further their own plan. If the Quest Giver is someone who Can Not Tell a Lie, expect the truth to be bent unrecognizably.

Contrast Enemy Mine, But Thou Must!, or, An Offer You Can't Refuse, where he quest giver has openly disclosed their evil intentions and forces the hero to go through with it anyway. Inverting the trope produces Detective Patsy.

If this was all a ploy by the Obi Wan to help, improve, or evaluate the hero, then it's a Secret Test

Anime and Manga

 * Puella Magi Madoka Magica: Kyubey is not exactly upfront about what becoming a Magical Girl entails...
 * Kagihime Monogatari Eikyuu Alice Rondo:

Comic Books

 * In All Fall Down, is this to Siphon and the Pantheon when he sends them on a mission to the moon.

Fan Works

 * in With Strings Attached. Though the quest itself was real, he had no business getting the four involved with it, and had no intention of seeing it through to the end. He entangled them strictly For the Lulz.

Film

 * in The Gamers: Dorkness Rising definitely counts as this. Most of the players don't notice because acting like Munchkins has effectively rendered them Genre Blind.
 * King Pelias in Ray Harryhausen's Jason and the Argonauts (and probably the original myth) sends Jason on the quest to find the Golden Fleece in order to forestall the prophecy that Jason will kill him. As insurance Pelias sends his son with Jason's crew to assassinate him later.
 * The League Of Extraordinary Gentlemen. M, the person who gathers the League together
 * Indiana Jones And The Last Crusade. Walter Donovan, who sends Indy after the Grail,
 * Played with in Fifty/Fifty: when Martin Sprue hired Sam French and Jake Wyer to help Akhantar overthrow General Bosavi, he is completely sincere, and genuinely wants to help the people of Tengara. Then Bosavi cuts a deal with the US government, and Sprue gets ordered to sell out Jake and Frenchie.

Literature

 * Sharon Green's The Far Side of Forever. The man who magically summons the protagonists together and sends them on the mission turns out to be the Big Bad behind the evil plot.

Live-Action TV

 * In the Doctor Who story arc "The Key to Time", the White Guardian commissions the Doctor to retrieve the fragments of the Key to Time to keep them out of the hands of the Black Guardian.

Tabletop Games

 * Basic Dungeons & Dragons module CM3 Sabre River. The Seer sends the PCs to retrieve the sabre's hilt so he can end the curse on the title river. In fact the Seer is the one behind the curse, and wants the hilt so he can recreate the sabre and become invincible.
 * The Ravenloft module Touch Of Death involves  uses the party to try and awaken a powerful Mummy.
 * There are so many examples in Shadowrun it's pretty much become an expectation. Standard adventure design seems to be "Johnson gives the team a mission, the team makes a plan, the plan goes wrong so the team shoots their way out, Johnson double-crosses the team."
 * The general assumption in all cyberpunk games is that whoever's hiring you has huge ulterior motives and may decide to shaft you. It's so overdone, some GM's have started throwing non-treacherous quest givers at their groups just to watch the expressions of total incomprehension on the faces of the players.

Video Games

 * The Mentor in H-game "Erotical Nights" is actually the goddess of the succubi; who was training the character to out-sex succubi in order to create a human warrior able to survive her touch long enough to conceive an offspring.
 * The King in Retro Game Challenge's Guadia Quest RPG tells the heroes to go fight each boss, then turns out to be the final boss who wanted to bring chaos to the world by destroying the Balance Between Good and Evil.
 * Basically in Knights of the Old Republic II.
 * A lesser example from the first game is Hulas of the Genoharadan. The player will know going in that it's a Dark Side quest, but that Rodian is just using you to kill off the other guildmasters and take control of the whole thing himself. Of course, a Dark Side player can just finish off the job...and the guild.
 * Dragon Age: Origins has one quest where the player is assigned by  to deliver documents proving his rival, , has been ripping off his political supporters.
 * The Dalish send the PC to kill a wolf named Witherfang in order to stop a contagious werewolf curse from effecting their entire tribe. As it turns out
 * has no problem ratting out the party that rescues her, once she suspects Failure Is the Only Option.
 * In Dragon Age II an Antivan noble asks your help in arresting an elven assassin.
 * A much nastier one is when
 * Deus Ex. In the latter half of the game, you kill the people you worked for in the first.
 * If you want to.
 * StarCraft  I won't even mention the Z-word in episodes 2 and 6.
 * Guild Wars: Divinity coast, several prophecies mission before the last one, Possibly a few Palawa Joko quests.
 * The Pope in Grandia II sends you to go collect all of the pieces of Valmar, the god of evil, to be resealed. Unfortunately
 * Dungeon Siege 2: The old Azunite student
 * Two instances in the Oblivion:
 * In Dark Brotherhood, your correspondence containing the names of people to kill is hijacked by a traitor, who uses you to murder before your mentor catches up with you to reveal the truth.
 * During the Fighters Guild storyline, you infiltrate the Blackwood Company, which sends you to clean out goblins overruning the Water's Edge settlement. . Partially Subverted in that
 * The mage's guild quest to visit the count to get a book back. His retainer tells you to meet him at a certain time.  Three false quests in one (although only one quest giver was evil).
 * Where the spirits have lease; after digging around in a Haunted House, you find the body of an old wizard (killed for being evil). He says he's repented and asks you to replace his hand so he can make things right.
 * In The Legend of Zelda Phantom Hourglass one dungeon has an Escort Mission with some Obviously Evil Creepy Child girls. Needless to say, they're the dungeon's boss.
 * Another Zelda example is Blind The Thief in The Legend of Zelda a Link To T He Past.
 * Deadly Premonition has you running quests for both The Dragon and The Big Bad. Subverted in that some are rather benign fetch errands.
 * Would you kindly remember BioShock (series)?
 * In the spiritual predecessor ,System Shock 2, it is revealed that your quest-giver for the first half of the game has been.
 * In the Tribunal expansion for Morrowind
 * Ratchet and Clank 2002 spend the first half of the first game trying to contact Captain Quark, who sends them to his hidden base planet in order to demonstrate their heroic worth.
 * Ratchet and Clank Going Commando: It turns out the whole time, the man the duo have been working for was  in disguise.
 * Captain DeSanta from Red Dead Redemption, who forces Marston to Kick the Dog in the course of his mission path and, eventually, betrays him outright.
 * Wario Land 3: The protector of the music box world sends Wario on a quest to retrieve five magic music boxes to restore his power.
 * Master Li in Jade Empire. After you kill the Disc One Final Boss, he reveals he's used you to obtain the Dragon Amulet and the throne of the Dragon Empire.
 * In Etrian Odyssey II, a couple of Side Quests were actually posted by bandits taking advantage of the noticeboard system to lure unwary adventurers into traps. The bartender who manages the request system is understandably pissed when he finds out, and warns your Guild when they take the second mission.
 * The Illusive Man in Mass Effect 2, who feeds you misinformation about your former squadmates (he should know what Liara is doing, at least), leaks info about you to Alliance intelligence to further alienate you from old friends, and.
 * The titular Task Maker.
 * In Thief: The Dark Project, a client named Constantine asks you to find The Eye but it turns out he's really
 * Pretty much the entire plot of.
 * In Myst, the player is led to choose which of the two brothers is good and which is evil, both brothers presenting themselves as good and their brother as evil. The twist is that both are evil and if the player helps either, the player will be trapped in a book for eternity. The only way to progress is to view both as untrustworthy and do the opposite of what they agree on.
 * The original Baldur's Gate included a textbook example with, who initiates a Surprisingly Easy Mini Quest that ultimately results in you being framed and wanted to mass murder across all of Sword Coast... just as he planned.
 * In the sequel,  sends the player on a side quest to kill some monsters menacing his land. It turns out he's actually trying to ruin the player's reputation, and the monsters are actually some paladins on the same fake quest under a disguise spell.
 * Last Scenario goes above and beyond on this one: not only was the Mysterious Informant trying to manipulate the main character in the guise of guiding him, but
 * Last Scenario goes above and beyond on this one: not only was the Mysterious Informant trying to manipulate the main character in the guise of guiding him, but

MMORPGs

 * A number of contacts in City of Heroes did this, more notably in City of Villains, including one who sent you on an "innocent" smash-and-grab into the Midnighter's Club, and then later informs you that you just stole a number of artifacts that will help your contact to free Rularuu, a god-like being who eats universes.
 * World of Warcraft:
 * An undead questgiver that gives a quest to collect materials for a "truth serum" to be used on a human prisoner held in the nearby Horde base. The serum is actually
 * The PC gathers items and eventually frees The Death Knight Teron Gorefiend. Players eventually fight him in the Raid Black Temple.. Known to be one of the hardest bosses in there.
 * Abercrombie's questline in Duskwood. Abercrombie is a creepy hermit who sends you on several quests to gather an odd assortment of items from all over Duskwood, supposedly for completely innocent purposes. Short of actually flashing up on screen the words "Stop now before it's too late, you idiot!" the game does everything possible to clue you in to the fact that doing Abercrombie's bidding is not the smart thing to do. But will you listen? Like hell you will.
 * The crone you meet along the game's single longest questline who sends you to meet and revitalize Thorim
 * Neko Matta of Adventure Quest Worlds at first appears to be helping you in your fight against Chaos Shogun Kitsune by giving quests to you. It eventually turns out that it was all a ruse as he was actually buying Kitsune enough time to summon the O-dokuro.
 * The Great Godfather of Soul is another Treacherous Quest-Giver, as he sets up Lord Ovthedance by claiming he cheats in dance contests and cons you into doing his dirty work for him so he can take the title of Dancing Champion for himself... and he would've succeeded if you hadn't won the /Dance Off Minigame, after which he vows vengeance against you with help from his manipulator, Chaos Lord Discordia...
 * One of the quests of the Sharn Syndicate chain from Dungeons and Dragons Online has you working with Burgundy Tir, who has recently contacted an underlord of the Sharn Syndicate. He sends you on a run with his agent Zircon, a Warforged who has VIP access to the Lordsmarch Bank, in order to steal the Stormreaver Fresco, a piece of art from ancient times. Zircon, who it turns out is the underlord, betrays you during the mission, running off after getting his hands on the Fresco in hopes of framing you for the theft, leaving you to escape the vault and deal with Iron Sentinels and the city guard. Later, during a mission to kill Zircon and retrieve the Fresco for its real owner, a dragon by the name of Kear, you learn that Burgundy Tir was behind the whole thing. Since you can't kill Burgundy, you instead blackmail him into giving you an item of his in return for your silence after the mission.
 * Calder Cob is an early questgiver you meet in the introductory Archet quests for Hobbits and Men in The Lord of the Rings Online. The best soldier of the village leader, Captain Brackenbrook, Calder sends you to Bronwe's Folly, a ruin that turns out to have been claimed by the Blackwolds, in order to kill wolves. The wolves turn out to be the property of a Blackwold Wolf-master, who it turns out was tipped off about your arrival by Calder and who you then have to kill. The rest of the intro quest line involves proving Calder Cob's treachery and the truth of the Blackwolds' intentions to assault Archet to the Captain, who Calder has been serving as a Treacherous Advisor to, as well as making plans to defend the village from the assault in question. In the final instance of the quest line, where the Blackwolds finally do make their assault, Calder Cob becomes your final enemy.

Web Comics

 * Order of the Stick: Nale relies on Roy's willingness to accept a sidequest in order to send him on a useless quest for starmetal in order to slow him down.
 * In one Dungeons and Denizens story - starts here and ends here.
 * Eight Bit Theater: Sarda sends the Light Warriors on a quest to collect the Elemental Orbs. That way he can use them to become all powerful, and kill the Light Warriors.
 * Well, that's not quite true; after all, he's quite clearly able to kill them with barely a thought, anyway, and has evidently done so enough times that he got bored with it. His real goal is much pettier: he just wanted to given them the means to reach their potential, only to dash them without breaking a sweat, to drive home the point of how much more powerful than them he really is.
 * In Homestuck, the guide for both Vigilante Troll Terezi and "bluh bluh huge bitch" Vriska is the, guiding them to go against the plan with her own motives to
 * Closer to Evil Versus Evil, given that
 * Schlock Mercenary had the Toughs backstabbed by the employers more than once, including General Xinchub. Kevyn even started his job for King Lota with devising a backup plan in case things will go bad again.
 * xkcd muses as to how Opportunity will react to being left on Mars.

Web Original

 * In the French webfiction Les Aventures de Morgoth, when the titular mage with an Unfortunate Name is being briefed about adventuring, Vertu recounts a quest where the sponsor was not treacherous, before adding that it's the only known such instance in over a century (it's a Crapsack World Played for Laughs).

Western Animation

 * Veggie Tales: The Lord of the Beans had the Head Elder of the Razzberry Forest be secretly in the pay of Scaryman.