"Well, we know in other cases with their later technologies that the Ancients used sensors that restricted access by detecting specific genetic markers."An item, MacGuffin, or other such that can only be used by someone who is, for example, pure of heart, a certain age, part of a certain family/bloodline, or has some rare property that only certain people have. This does not include needing a password, key, or other such item. In other words, the requirement to use it has to have more to do with the actual plot, although the actual importance of said requirement does not matter. Sometimes the requirement is a background detail, other times it has a major effect on the story. Supertrope to Level-Locked Loot, Loyal Phlebotinum, Only the Pure of Heart, and Only the Chosen May Wield. Sister Trope to Operator Incompatibility. Contrast Self-Guarding Phlebotinum, which is when the item protects itself against people with a certain quality. See also Phlebotinum-Handling Equipment. If a character is the only one in the cast who meets the requirements, they might also be The Team Benefactor.
— Dr. Dale Volker, "Human", Stargate Universe
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Anime & Manga
- Various types of mobile suits are made specifically for Newtypes.
- The RX-0 Unicorn Gundam from Mobile Suit Gundam Unicorn can only be piloted by someone who has a noble heart, and has a noble reason to pilot it. The pilot also has to be a Newtype.
- In Naruto, the sword Samehada can only be wielded if it likes the taste of the wielder's chakra.
- Barrage: Astro's weapon is described as working only for those who have the qualifications. Initially, it's assumed to be his bravery and pure-heartedness, but it turns out that it's actually royal blood, which Astro secretly possesses.
- The Mighty Thor: "Whosoever holds this hammer, if he be worthy, shall possess the power of Thor." Only a very few people have been able to lift Mjolnir: Thor himself, Beta Ray Bill, Thunderstrike, Captain America, and the occasional Heroic Bystander and/or emergency worker. In the JLA/Avengers Intercontinuity Crossover Wonder Woman was also found worthy. Superman wasn't, but Odin temporarily removed the enchantment so he could use it.
- Judge Dredd: the Lawgiver guns used by the Judges are specially made so that only a Judge can use them, by testing their DNA upon holding it. If someone that is not authorized to do so uses it, it explodes.
Films — Live-Action
- Lightsabers in Star Wars can be effectively wielded only by Force-users, with very few exceptions. This is explained by the weapon's very counter-intuitive balance and preternatural quickness needed to wield it. Only one such exception is in the film canon, General Grievous, and he's a cyborg, with his mechanical precision of movements preventing him from julienning himself with the energy blades. The other film canon non-Force user who tries to handle a lightsaber, Han Solo, is wise enough to only use it to cut open a dead tauntaun. Also noteworthy is that Han is apparently well aware of how easily he could wind up missing chunks of himself, and keeps the hilt close to himself and his elbows tight to avoid swinging the blade around too much and winding up having to change his name to Han Duo.
- In District 9 only prawns can use the prawn superweapons. Thus human Wikus becomes of interest to the authorities when he is infected with alien prawn DNA.
- In Lone Wolf, only a Kai warrior such as Lone Wolf can wield the Sommerswerd. If anyone else tries to wield it, its powers would slowly fade until they were lost forever. The sword will also burn any evil beings who lay hands on it.
- The Star Wars Expanded Universe novel The Crystal Star features a Jedi and Dark Jedi who have lightsabers that lack a traditional on/off switch. Instead, igniting them requires using the Force to close an internal electrical connection. In the New Jedi Order series the Skywalkers have a similar security feature on the bridge airlock of the Jade Shadow: opening the hatch from outside requires use of the Force to manipulate the internal mechanisms; the actual hand-operated latch is nonfunctional.
- Lloyd Alexander's Chronicles of Prydain: Only a member of the House of Llyr, such as Princess Eilonwy, can command the power of her "bauble" (a.k.a. the Golden Pelydryn) and use the House's magical spells.
- The Spear of Telesto in the Blood Angels novels can only be wielded by carriers of their Primarch Sanguinius' genes (i.e. just the Blood Angels and their successor chapters). Its flamethrower attack will likewise refuse to damage such.
- Harry Potter:
- Downplayed with wands, which have a certain loyalty to their owners and will not generally operate at full capacity for anyone else. Lore around the Elder Wand, a legendarily powerful item in Deathly Hallows, suggested that it may only work at full capacity for the person who has defeated (not necessarily killed) its last owner. Despite taking the wand from Dumbledore, it is no more powerful for Voldemort than his usual wand (which isn't saying much given the scale of Voldemort's powers), because he misread the chain of succession.Explanation (MAJOR SPOILER WARNING!)
- Invoked by Dumbledore in Philosopher's Stone. He sets up the Mirror of Erised so that only somebody who wanted to get the Stone but not use it would be able to retrieve it.
- Buffy the Vampire Slayer has a big hammer could only be wielded by someone of near-godlike (or Slayer) strength.
- Stargate Verse:
- Some Ancient technology (most famously the Puddle Jumpers) requires a genetic marker (quickly dubbed the Ancient Technology Activation [ATA] gene) to activate. This renders it inaccessible to most humans in the galaxy since the gene is recessive and tends to get bred out of smaller populations. Earth's is big enough to maintain it, and the SGC eventually developed a gene therapy to add the gene to their personnel.
- Much Goa'uld technology requires bloodborne naquadah to activate, including the hand device and healing device. The most common way to get this is by hosting a Goa'uld, hence why Samantha Carter, who briefly carried a Tok'ra in "In the Line of Duty," can use them.
- The Charmed Ones' Book of Shadows would only let good beings or mortals touch it and it would shield itself from Demons and the like. Similarly, The Grimoire, being an ancient and demonic tome, would only let demons and the like touch it and wouldn't let anyone good touch it as it was the Evil Counterpart to the sisters' magic book.
- In season 2 an evil witch is released from a magical sleep and goes out seeking her wand. If she were to obtain it she would be nigh impossible to vanquish. The only way to destroy her would be to use her wand against her, but the only person capable of wielding it would be someone who was the seventh son of a seventh son.
- In Season 8 Hippolyta's Belt would only let a morally good woman wear it or else it exploded.
- In the Doctor Who episode "Dinosaurs on a Spaceship", the controls of the alien spaceship only respond to two pilots who are genetically linked. (How lucky that Rory's dad got dragged along on this adventure...)
- In Fringeworthy, only a tiny percentage of the human race has the innate ability to use the Fringepaths without dying.
- In Warhammer 40,000, Tau vehicles apparently use a genescanning system to prevent hijacking, as seen when an Imperial commando tried to steal a battlesuit and got fried for it.
- Dungeons & Dragons:
- Spell scrolls can usually only be activated by characters who can also access the spell through their class spell list (e.g. only a wizard or sorcerer can use a scroll of magic missile, only a cleric or druid can use one of flame strike, et cetera). This restriction can be overcome with a Use Magic Device check. Use Magic Device also lets you overcome several other restrictions, most of which fall under Level-Locked Loot.
- Downplayed example: The Holy Avenger longsword is ordinarily "just" a +2 cold iron longsword. In the hands of a paladin it becomes a +5 holy cold iron longsword that also provides spell resistance to the wielder and anyone adjacent to them, as well as allowing them to cast greater dispel magic once per turn.
- Sanctified and corrupt spells (from the 3E supplements Book of Exalted Deeds and Book of Vile Darkness, respectively) require the caster to be of a class that prepares spells and be of respectively good or evil Character Alignment.
- NEXTs in Armored Core, which can only be piloted by people with some special type of psyche. Ill-defined, but still an example.
- The Elder Scrolls series has a few examples:
- In The Elder Scrolls III: Morrowind, you must be wearing Wraithguard in order to handle Keening and Sunder without dying instantly. And in order to even wear Wraithguard, you must sacrifice a large portion of your health, permanently. If acquired the "standard" way, through Vivec, he will take you "outside of time and space" so that it doesn't harm you.
- The Elder Scrolls IV: Oblivion:
- The player can't wear the Amulet of Kings; the clasp refuses to close. An in-game book, The Amulet of Kings, explains that it can only be worn by those who have "Dragon Blood" in their veins. This was initially unclear in meaning, but with the release of Skyrim it's evident that it refers to the Dovahkiin (Dragonborn), humanoids with the souls of dragons, of whom the Septim Dynasty is one line.
- The Divine Crusader equipment set in Knights of the Nine. To use it, you need to go on a long, annoying pilgrimage, and if your Infamy is raised to anything above 1 after you have obtained it, then you must go on said pilgrimage again.
- The Apple of Eden in Assassin's Creed can only be used by descendants of the first civilization.
- Various items in the Neverwinter Nights series are keyed to a particular race, class, and/or alignment. For example, the sequel's Hammer of Ironfist can only be wielded by dwarves, and many prestige classes have unique armors. A successful Use Magic Device check will override these restrictions, however.
- Inverted with the plot-relevant Ceremonial Sword of Neverwinter and the Silver Sword of Gith, which are classified as "universal swords" to allow even characters that lack sword proficiency to wield them. The downside is that this typing also means that none of your weapon specialization feats (e.g. Weapon Focus) work on them.
- The MacGuffin of Skullgirls, the Skull Heart, can only be used by those who are absolutely pure of heart, or else they will become the Skullgirl themselves. Parasoul's mother wanted to end a war, and the war ended, alright...by turning her into the Skullgirl and forcing everyone to unite against her. Similarly, Bloody Marie presumably wished for her freedom from enslavement by the mob, only to become as ruthless as the mobsters she kills.
- In the Paper Mario: The Thousand-Year Door intro, the chest containing the magical map that the merchant gives Peach says that only someone pure of heart can open it. Peach was able to open it. Later, it is revealed that The merchant was actually Beldam in disguise; who did so because she was trying to unseal the Shadow Queen, and needed the Crystal Stars to do so since the Crystal Stars are needed to open the Thousand Year Door, which is where the Shadow Queen is sealed. The magical map is what allows you to find them.
- In The Legend of Zelda: Ocarina of Time, Link could only wield the Master Sword when he is an adult, so upon gaining it he was put into a sleep for seven years.
- Inverted in Severance: Blade of Darkness. The macguffin required to defeat the final boss is the only weapon that isn't restricted by class.
- In Tales From My D&D Campaign, the evil Kua-Toa have found out how to power an alchemical Invisibilty Cloak using their skin secretions. This not only lets them produce the cloaks for 1/100th of what such a powerful item should cost, but also makes them impossible to steal, as only a living Kua Toa can produce the chemicals that power the thing.
- Regular Show has the Sandwich of Death, which is deadly unless you eat it the right way: by wearing a mullet and cut-off shorts.
- The Elements of Harmony in My Little Pony: Friendship Is Magic require wielders who embody their respective virtues and work together as a team. Otherwise, as shown in for example The Return of Harmony when five of the Mane Six were 'discorded', they simply don't work.