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- A very interesting case in Bleach is Giriko and his Time Tells No Lies ability. Essentially, it's a contract he invokes on himself or on others, with the spirit of his watch. It can take multiple forms; increased strength, the power to kill by line of sight, and so on. The catch is that no party involved can violate this contract, or they'll be incinerated—the part that makes it a Geas. Wonder what ever happened to Giriko's eye? Sadly, Giriko doesn't see much action.
- In more of a direct mind control example, Zommari the 7th Espada can hit you with a spell from any one of his 50-something eyes, controlling whatever he hits. If he hits your head, he gets your whole body.
- In Code Geass (the title of which this trope inspired), Lelouch has the ability to place a person he makes eye contact with under a geas, as they have to do whatever he tells them to do once Lelouch's "Geass" power kicks in (though it only works once per person). The "Geass" powers in this series often work more like a psychic power or ability (such as making people fall in love or mind reading), which makes the majority of those powers unrelated to this trope. Only Lelouch appears to have the ability to lay a proper geas on people.
- The Expanded Universe introduces more characters with the same type of power as Lelouch. Rai, protagonist of the Visual Novel Lost Colors, has a version based off of hearing rather than eye contact, while the Nintendo DS RPG's Big Bads Castor and Pollux have "The Bless", which works on the same person more than once.
- In Hunter × Hunter, it's eventually revealed that Nen can be used this way to provide a power boost, or to become proficient in a Nen style the user isn't normally able to master. For example, Kurapika eventually gains the ability to conjure unbreakable Nen chains, under the condition that if he ever uses them on anyone other than a Phantom Troupe member, it will kill him. He can also imbed nen spikes in people's hearts, which will kill them if they don't follow a command he gives while doing it. He manages to effectively de-power Chrollo this way, making the nen spike activate if he uses his powers.
- Dunstan in A Distant Soil is a Fair Folk, and he says he is under a Geas that he can't tell a mortal soul who he really is while he's on mortal soil. However, it applies only to soil, that is to say, the ground - which means when he's on a cruise ship or a spaceship, he can actually mention this without violating it.
Films — Animation
- In Howl's Moving Castle, the Witch of the Waste puts a spell on Sophie that ages her into an elderly woman; one of the provisions of the curse is that she can't tell anyone about what's happened. When Sophie attempts to do so at one point, her mouth quite literally seals itself shut.
- This also appears in Spirited Away, another Miyazaki film. The witch Yubaba uses enchanted contracts to keep her workers in eternal servitude, but is herself under a geas: if someone demands a job, she must grant their request. Yubaba complains about it—"I can't believe I took that oath, to give a job to anyone who asks..."—but is still bound to the rules. There's nothing stopping her from attempting to distract the person requesting employment, or even outright threatening them, but so long as they keep asking, they'll be hired.
Films — Live-Action
- Ella Enchanted: The title character is under one which compels her to obey not only any order she's given, but also suggestions such as by vendors to "buy this sandwich" and "try this perfume."
- Liar Liar: The main character is placed on a 24 hour gear that makes it so he Cannot Tell a Lie. If he tries to say a lie, it comes out a Gibberish. if he tries to write a lie, he will write the truth. He is even unable to ask a question if he knows the answer to the question is a lie.
- The otherworld beings from the Bartimaeus books are automatically compelled to obey their orders from magicians by something perhaps like an obsessive compulsive disorder.
- Bartimaeus explains that obeying the orders is necessary, since there was one djinni that refused to kill another djinni it loved. The djinni's repeated refusal to obey the order tore apart his essence and caused him to explode, destroying the prince commanding him and the prince's entire palace. Since then, magicians tend to be more careful about which djinni they summon.
- It's also in the djinn's best interest to just do what the magician commands and get it over with, lest the magician cast the Curse of Indefinite Confinement or the Curse of the Shriveling Fire, which is exactly as unpleasant, painful, and deadly as it sounds.
- In Dragon Bones, Oreg is magically compelled to serve whoever owns a certain ring at the time. (It's given from father to eldest son, and is unremovable until death). He suffers severe pain if he doesn't obey, even if he's genuinely unable to do as he's told. He also suffers when he's away from both his master and the castle he's magically bound to. He's also immortal, unless killed by the owner of the ring. The implications are quite horrible.
- Shaman of the Undead must lead the souls of the dead to the afterlife, or she loses part of her own soul and somebody else dies in the place of the undead ghost. People killed by Black Magic are excluded from the geas, because they turn into harpies and as such can't enter the Land of the Dead.
- Features into the backstory of Diarmuid in Fate/Zero. He was bound to serve Fionn mac Cumhaill, but also had a curse on him that caused women to fall instantly in love with him, which is worse than it sounds: his lord's fiancee, Grainne, succumbed to it and placed him under a geas to make him run away with her. They eventually got married with Fionn's consent, but when Diarmuid was mortally injured and needed Fionn's Healing Hands to save his life, Fionn delayed long enough that Diarmuid died. As a Heroic Spirit summoned into the fourth Grail War, Diarmuid's only wish is to be able to make up for the whole mess by serving his Master faithfully. History repeats for poor Diarmuid. His master Kayneth's wife Sola falls in love with him and tries to use the Command Seals to make him reciprocate. Then he is betrayed by Kayneth and forced to kill himself. Diarmuid dies cursing everyone involved.
- Kiritsugu Emiya convinces Kayneth to bow out of the Grail War by, as part of the terms of their deal, offering to bind himself with a geas that will prevent him from harming Kayneth or Kayneth's fiancee Sola-Ui on penalty of losing his magecraft. When Kayneth takes the deal, Kiritsugu does indeed geas himself... but the geas doesn't say anything about letting someone else harm Kayneth and Sola-Ui, who are promptly gunned down by Kiritsugu's associate.
- Not stated to be such, but this is more or less the case with the Witch King of Angmar in The Lord of the Rings. It was prophesied that he shall not fall by the hand of Man, and in the end he is taken down by a hobbit and a woman.
- The novel Cryptum has a technological variant that can be imposed by Forerunners on other species (the term geas being the closest word in human vocabulary to describe the condition). The Librarian imposed one on the entire human race to make sure her husband was found and awakened at the proper time, the compulsion being that the humans present at his location would unknowingly sing a song that contained the codes needed to allow his reviver passage. Some Forerunners believe that their forerunners, the Precursors, had imposed a geas on Forerunners as well.
- Halo: Primordium takes it farther. One character has to deal with rejecting a geas that forces her to go to the dreaded Palace of Pain, which would ensure her and her companions' deaths. Turns out, gei are subject to change via nearby beacons, and the ones on that particular Halo have been hijacked by the less favorable side in the Enemy Civil War.
- Another aspect of the human geas is that the memories, and eventually entire personalities, of ancient humans are carried by many humans, "germinating and blossoming" as they do/see/hear/etc. something that triggers it. It gets to the point where the "old spirits" can hijack their host's body to communicate. None of this is considered a pleasant experience, to say the least.
- Used in The Laundry Series by Charles Stross, which is essentially MI6 meets H.P. Lovecraft. Figures prominently into the second book, The Jennifer Morgue where the protagonist is put under a reality-warping geas that essentially transforms him into a James Bond-esque hero (Turns out this is exactly what the Big Bad wants, as he plans on dismissing the geas right before the protagonist is about to win, at which point Reality Ensues and he can kill the protagonist easily. Fortunately, it turns out the protagonist was actually playing the role of Bond girl).
- Jo Walton's Tanagiri novels feature several geases, courtesy of the Irish Fantasy Counterpart Culture.
- In the The Witches Of Eileanan series several people are put under Geasa. Most of them are, or given them by, Khan'cobans (Like Inuit elves with ram's horns), though there isn't a spell involved, it's mostly just a task or obligation that is given social significance if one were to break it or accomplish it. It's less a spell and more a binding of honor.
- In the Cassandra Palmer series, the Geis is like a love spell, a magical claim that warns off any would-be suitors and compels the the two people to be attracted to each other.
- In Deep Secret, Rupert defeats one of the villains by laying a geas on him such that if he tries to use magic again he'll die.
Rob: 'Tis a heavy thing, tae be under a geas.
- Parodied in Sourcery, where everyone else thinks the guy under the geas is talking about geese, leading to much confusion. And then it turns out a geas really is a kind of bird.
- Parodied again in A Hat Full of Sky and Wintersmith, where Rob Anybody is put under a geas by his wife, Jeannie, to protect Tiffany Aching. It becomes a Running Gag that Daft Wullie keeps thinking Rob means an actual goose.
Daft Wullie: Well, they're big birds.
- Golems appear to be under a geas which is very similar to the Laws of Robotics. "A golem cannot harm a human" unless their writings include the addendum: "unless ordered to do so by duly constituted authority."
- In Clark Ashton Smith's "The Seven Geases", the protagonist is put under of a sequence of, well, seven geases. Which comes off as mind control.
- In the Lord Darcy story "A Case of Identity", Lord Seiger is by nature a conscienceless psychopath; a very extensive geas has been laid upon him never to hurt anyone save at the direct order of his superior in the King's Service. He shows no signs of resenting this, but he clearly enjoys those moments when he's let off the leash.
- Fairies in Artemis Fowl are under a geas set by their first king, Frond, to never enter a human's dwelling without permission. The idea was that fairies were mischievous and would abuse the humans. Over time, the magic has faded a little, but is still binding. At least until a certain imp warlock tears it down singlehanded for them between the fifth and sixth books, anyway.
- In the Vows & Honor stories, the sorceress Kethry's magical sword, Need, compels her to aid women in trouble, beginning with an insistent mental tugging that escalates to excruciating pain if Kethry fails to respond promptly. As noble as the intent of the geas is, in practice Kethry and her partner Tarma mostly find it enormously inconvenient given that it makes no distinctions regarding context and has almost no sense of proportion, forcing the pair to stick their noses into everything from cases of basic domestic violence all the way up to demon-worshiping cults-whether their interference is appreciated by the victims or not. It also gives them a reputation as heroes crusading selflessly on behalf of women everywhere, greatly complicating their efforts to actually make a living as freelance mercenaries since people assume they're more interested in just causes than in getting paid.
- Need's geas also prevents its bearer from ever using it to harm a woman-again with no sense of context or proportion. Kethry's granddaughter Kerowyn, who mostly manages to avoid being yanked around by the sword the way her grandmother was, nearly gets killed when she runs up against an enemy priestess in the midst of a battle and Need abruptly paralyzes her in place rather than allow her to defend herself.
- In the Inheritance Cycle, a character who swears an oath in the Ancient Language is incapable of breaking it (though they only have to obey the letter, not the spirit). What is more, a person can be compelled to swear such an oath by someone who knows their true name. There is an out, however-if who they are changes so much that their True Name in the Ancient Language changes, all oaths they've sworn up to that point are null-and-void.
- The Faerie Queens are known to put these on people in The Dresden Files. Titania in particular put a geas on the Summer Lady, Lily, and Summer Knight, Fix, both friends of Harry's, such that they could not offer information or help to him, despite them also owing Harry a favor for past deeds. They manage to get around it, either by Harry transferring the favor (they can't help him, but they can help the person with him), or by the Lady and Knight getting creative (while Fix can't warn Harry about Summer's forces, he can make a show of threatening Harry, which still lets him know they're on the prowl).
- Harry Potter:
- These are called "Unbreakable Vows" in Harry Potter and the Half-Blood Prince, wherein Severus Snape agrees to let Narcissa Malfoy place this spell on him as an act of good faith. It's explained that breaking the vow is fatal, but this never actually happens in the story so details are vague.
- The Magically Binding Contract that compels Harry to take part in the Tri-Wizard Tournament in Harry Potter and the Goblet of Fire is really more like this than a contract, since he is entered into it without his knowledge or consent. The consequences of breaking the contract are not explored and are a subject of much Fridge Logic.
- In Forgotten Realms:
- During and before the Time of Troubles, Kelemvor and his family were under such a curse. Originally the curse condemned Kelemvor's family to never accept payment for helpful deeds. In Kelemvor's case, the curse flipped so that he can never do anything for anybody without accepting a fair compensation for it.
- In the Counselors and Kings series from the same setting, a wizard-word oath is a self-inflicted, usually minor version - a Halruaan wizard who swears to do something "By wind and word" will be bound to follow through, though it's up to the wizard him or herself to interpret the oath. For example, when master wizard Basel Indoulur's apprentice Tzigone offends and humiliates his rival Procopio Septus, Basel swears he will "deal with her accordingly", which Procopio intended to mean "punish her" but Basel interpreted to mean "reward her", since he thought Procopio had it coming to him. More seriously, supporting antagonist Dhamari Exchelsor is bound by such an oath to never summon any creature he doesn't understand and can't control. Since his plans require him to summon Fair Folk who more than fit those criteria, he needs to manipulate Tzigone into helping him.
- In Zeus Is Dead: A Monstrously Inconvenient Adventure, any oath sworn by the River Styx (figuratively or literally) is binding, even for a god. Hermes even wiretaps the Styx so he can spy on anyone who utters such an oath in secret or in unthinking rage, and uses this to blackmail Zeus.
- The title character of Ella Enchanted is given, at birth, the "gift" of obedience, and she has to do whatever she is told, provided the order is given in a language she understands. (And she's an Instant Expert at languages.)
- In The Will of the Empress, Shan implies in a very squicky way that "There are ways to make mage wives obey you."
- One of the Xanth books is titled Geis of the Gargoyle.
- Schooled In Magic: There are many spells of this sort mentioned or shown. People are compelled to be loyal, obedient and tell the truth with them, etc.
Myths & Religion
- This is all over the place in Irish Mythology:
- Diarmuid O'Duibhne was "under geis" not to hunt the Boar of Ben Bulben. But Finn MacCool tricked him into participating in a hunt that tracked the very same boar, and the boar killed Diarmuid.
- Cú Chulainn was under geasa never to refuse an offer of food, and never to eat dog meat. Of course, eventually his enemies offered him dog meat. He ate, and was killed soon afterwards.
- Cú Chulainn's son, Connla, was placed under a three geasa: to never turn back on a journey, to never turn down a challenge and to never give his name. This leads to Connla seeking out his father when he came of age, only to die at his father's hands when refused to speak his name. Depending on the version, the one who put the geis on him was either his mother who did not leave Cú Chulainn on the kindest terms or else Cú Chulainn himself.
- High King Conaire Mór was under a whole host of geasa. Eventually events conspired to make him break all his geasa in a single day. The same night, he was killed by sea-raiders.
- The Children of Tuireann: Lugh of the Long Hand is under geis never to refuse a second request. The sons of Tuireann exploit this when he sends them off on a quest to redeem themselves for killing his father. First, they asking Lugh to lend them the horse of Manannan, which he refuses, then ask him for the boat of Manannan, which is what they actually want.
- Samson in the Book of Judges of the Old Testament was bound to the terms of the Nazirite vow (he was not allowed to partake of wine or anything else made from grapes, touch a dead body, nor cut his hair) due to a promise made by his mother; breaking the vow would result in the loss of the super strength God had blessed him with. Sure enough, when Delilah, who had been hired by the Philistines to trick him into revealing his secret weakness, shaved him bald, he was left defenseless and promptly taken captive. It turned out the effect was as temporary as his baldness. By that point Samson had already broken the other terms of the Nazirite vow. The hair-cutting was just the last straw.
- As befits the genre, the 3rd Edition GURPS sourcebook Celtic Myth has rules for imposing geasa on characters.
- There is a spell called geas in Dungeons & Dragons that forces the character to fulfill the terms. Clerics call the same spell "Quest", and also have a "Mark of Justice" that places a curse on a character who breaks the conditions of the Mark.
- The powers of Wu Jen and characters under the various Vows of the Book of Exalted Deeds have specific behaviors or tasks they must perform to maintain their powers.
- Geasa were used in 3rd edition Shadowrun to recover points of magic that had been lost by shaman/magicians/adepts. Your character had to accept some sort of condition to recover a point of magic. Usually anything the GM wanted/was willing to allow but classic ones were some sort of talisman that you had to keep on your person, having to fast on a regular basis, spend time in meditation, or only use magic in certain circumstances. Breaking the geas reduced your magic back to it's normal level.
- In Mage: The Awakening, geasa can be inflicted by mages who have gained Mastery of the Fate Arcanum. Working against the terms of a geas (or even failing to actively do something required by the geas) inflicts a very debilitating curse. A geas (and the curse for breaking it) can be made hereditary, affecting the subject's descendants as well.
- 7th Sea has the geas, a special ability that can be purchased at character creation. As long as you have the geas, it gives you an extra experience point each session, but if you fail it's condition you lose the geas forever.
- This is the power the demonic lilim have in In Nomine. They can look into a person's eyes and discover their true desires (ranging in intensity from 'needs a light for their cigarette' to 'needs to get a million dollars'). If they then fulfill one of them (or more) for the person, they can (attempt to) attach a geas to the person to do something in return. They're limited only by the scale of the desire (an easy-to-fulfill desire would grant a geas that only lasts an hour or so) and the target's ability to resist the compulsion. The dangerous part is the target is usually not aware the lilim is doing this, and doesn't have to agree to a Deal with the Devil for the lilim to get the geas. The only real defense is a combination of never looking a lilim in the eyes, and never accepting anything they offer, ever.
- In Exalted, the Primiodals placed one on their creations, the gods. It forbad them from directly attacking any Primoldial (except in self defence or on the order of Theion). The gods got around this by giving power to mortals whose free will means that their actions are seen as sperate from the gods. They were then free to help these humans as long as they themselves didn't attack a Primoldial; anything else was fair game.
- In Kitsune: Of Foxes and Fools "geased" is a consequence that prevents a fox from regaining foxfire for two turns.
- Lancer in Fate/stay night, whose true identity is Cuchulainn himself, has a geas that if a man from Ulster uses Caladbolg against him, he must lose the fight, but it never happens. The sequel, Fate/hollow ataraxia has Shirou play a trick on him involving his original two geas, though they are never stated outright: Three female friends of his from school offer Lancer a hot dog, an offer he can't refuse and (were it actually dog meat) something that could potentially kill him. This is actually related to how he originally died.
- At one point in Unlimited Blade Works Rin threatens to use Geas on Shirou. One bad ending in Heaven's Feel occurs when she follows through on her threat, placing Shirou under a Geas and using it to stop him from saving Sakura.
- In Fate/Zero, Kiritsugu uses one to eliminate Lord El-Melloi as a Master: he kidnaps El-Melloi's wife, and threatens to kill her, unless El-Melloi orders his Servant to commit suicide, removing himself from the Holy Grail War, in which case Kiritsugu will geas himself into never harming El-Melloi or his wife. El-Melloi accepts (as a magus himself, he can see that the self-geas scroll Kiritsugu is holding is genuine), and Kiritsugu's partner immediately kills both El-Melloi and his wife... after all, she wasn't under a geas to do them no harm.
- In Neverwinter Nights: Hordes of the Underdark, as a way of avoiding the But Thou Must faux-choice, the player character gets a geas to kill the evil sorceress Valsharess.
- Yoshimo in Baldur's Gate II is under a geas to betray you at a certain point of the plot.
- Referenced in Wild AR Ms 3 - Janus, after acquiring his demon form is bound to follow the Prophets' instructions, under pain of being blown apart by the remote bomb called Geas.
- In Quest for Glory IV, the Hero is placed under a geas by Katrina, giving him three days to recover the rituals needed to free the the Dark One. The geas is removed once he returns successfully with them.
- Continuing from the Halo plot thread mentioned in the "Literature" section, Halo 4 has the Librarian imprint mentioning to the Chief that a good part of the UNSC's advancement, including Cortana's design and the Chief himself, has to do with the geas she implanted into humanity over 100,000 years ago.
- In Dragon Age: Inquisition, an Inquisitor with Arcane Knowledge can figure out that Abelas' warning that the Well of Sorrows' power comes with a price isn't hollow: anyone who drinks from it is put under a powerful geas. Morrigan is dismissive of the geas since she believes that Mythal is long gone. Then it's revealed that Mythal is Flemeth.
- In The Order of the Stick, Belkar is put under a Mark of Justice which prevents him from dealing lethal damage (a D&D rules term, basically meaning any damage that isn't the kind you'd use in a sport fight — and Belkar never bothers with sublethal damage when he can get away with lethal) to any living thing within the bounds of a settlement. He also cannot travel more than a mile from Roy, on pain of suffering from a sickening curse. The curse is eventually invoked when Belkar stabs the Oracle, who had established a village around his tower for exactly that purpose, and then removed by a cleric who needed Belkar to protect him from an invading horde of goons.
- One of the powers that Acanthus Mages such as Amical or Tyler have in morphE.
- In The Gamer's Alliance, the archdemon Malphas ends up under a geas when he kisses fellow archdemon Nina Heeate's enchanted ring, and the geas forces him to serve Nina's every whim. It turns out that Nina was using magic and her female physique to mess with Malphas's mind, which confused Malphas enough to make the geas take effect. Nina doesn't keep Malphas on a tight leash, however, and instead lets him do what he wishes as long as he doesn't stand in her horde's way. The geas also requires Malphas to keep his mouth shut about the whole endeavour, further ensuring that Nina's part in the whole mess stays out of the limelight.
- An unusual example in Gargoyles; Demona once placed Goliath under a spell compelling him to obey the spoken orders of "whoever held the spell." Brooklyn seized the book from her, found the page with the compulsion spell, and tore it out before Demona could reclaim it, so that Goliath would follow Brooklyn's orders rather than Demona's. After Brooklyn and Goliath defeated Demona, Eliza found a way around the spell: holding the page, she commanded Goliath to act as he would if he were not under a spell from then onward. So essentially, for the rest of the show's run, Goliath was under a geas—to be himself.
- In Freakazoid!, a character who must not be named has the power to kidnap children, but only if they say his name out loud. At one point in his debut episode, he's in a bunk at a camp filled with kids, but is only able to speak to and interact with the ones who are foolish enough to say Candle Jack, and tho