History Main / WeakenedByTheLight

If the author is not careful, this can overlap with WeaksauceWeakness, or at least KryptoniteIsEverywhere. May be counteracted with a KryptoniteProofSuit. This [[FridgeBrilliance might be]] one of the reasons why it's GrimUpNorth -- the longer nights give sunlight-averse creatures more time to hunt. A common way of [[PlayedForLaughs playing this trope for laughs]] is to have a BasementDweller or goth be harmed by sunlight.

If the author is not careful, this can overlap with WeaksauceWeakness, or at least KryptoniteIsEverywhere. May be counteracted with a KryptoniteProofSuit. This [[FridgeBrilliance might be]] one of the reasons why it's GrimUpNorth -- the longer nights give sunlight-averse creatures more time to hunt.

* ''Manga/{{Bleach}}'': Espada #9 Aaroniero Arruruerie cannot stand sunlight and can't maintain or perform his shape-shifting in the light.

* The giant winged serpent in the ''Series/{{Sanctuary}}'' episode "The Depths" is intolerant of sunlight. This is what kicks off the plot initially. Remembering this helps Magnus and Will sneak past it later in the episode.

* ''WesternAnimation/HotelTransylvania'': Dracula and his daughter Mavis only go outside at night because the sun will cause them to turn to dust and disintegrate.

* In ''Series/{{Castle}}'', a case involving vampire fetishists uncovers an obsessively fixated "vampire" whose skin burns when it makes contact with light. Turns out he has an exceptionally rare skin condition.

* ''WebComic/UnwantedHouseguest'': Doctor Wolfula speculates that this may be the case for the Shadow Demon. [[spoiler: He's proven correct when the Shadow Demon is defeated by the beam of Owl Head Lighthouse.]]

* ''Manga/TimeStopBrave'': All creatures of the Forces of Darkness are nigh-invulnerable in the dark and can only be harmed by [[HolyBurnsEvil holy magic or holy weapons]] or by [[ReviveKillsZombie healing spells]]. When in the light, they can be harmed by anything.

* The ''Series/{{Goosebumps}}'' episode "Welcome to Dead House". As in the novel it's adapted from, the (kind of) undead townsfolk of Dark Falls are cannibals who are weakened by daylight, and can be killed by direct sunlight. Instead of pushing a tree over to expose the sun, the Bensons smash out a window inside of a house during TheSiege after the townspeople have managed to get inside of the house, causing their undead neighbors to disintegrate into EmptyPilesOfClothing. [[spoiler:Unlike the book, it appears as if this does permanently kill them, and the TwistEnding is something completely different.]]

* ''Manga/{{Shiki}}'': Vampires who meet the sunlight directly catch on fire and burn to death. However, there's also [[OurWerewolvesAreDifferent Tatsumi]] (and later [[spoiler: Natsuno]] too) who subvert this, due to belonging to a rare species of vampires who can survive under the sunlight. However, in everything else, they're exactly like the others.

* ''Animation/BoBoiBoy Movie 2'' features the nocturnal sloth-like aliens called Kang Kong. They are very slow during the day, but viciously swift at night. Gopal slows one down with a flashlight while [[PlayingWithFire BoBoiBoy Blaze]]'s fireball reveals many Kang Kongs slowly approaching them.

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* ''Manga/DemonSlayerKimetsuNoYaiba'': The [[OurDemonsAreDifferent demons]] cannot withstand sunlight and will be destroyed if exposed to it. This is also why Nichirin Blades are the only weapons capable of slaying them: demons possess a powerful HealingFactor, but because the ore of Nichirin Blades have absorbed large amounts of sunlight, [[OffWithHisHead decapitation]] with a Nichirin Blade will instantly, and without fail, kill a demon.

* ''WebOriginal/HamstersParadise'': The troglofauna living in the Sub-Arcuterran Cavern System are completely blind as they lack eyes but they do have patches of skin on their bodies that can detect light and they will instinctively flee from it. The reason for this is to deter them from traveling to the surface where they are at a distinct disadvantage to the sighted predators living there. Some of the insects and fungus living in the caves have evolved to take advantage of this by developing bioluminescence that scares away any troglofauna trying to eat them.

* The monsters under Calvin's bed in ''Fanfic/CalvinAndHobbesTheSeries'' vanish with light. Except for Jark, [[spoiler:because he's partly absorbed Calvin's DNA. It doesn't last, though]].

* In ''Fanfic/HopeComesToBrocktonBay'' this is the downside of [[spoiler:Shadow Stalker's new powers]] and she is finally killed by very powerful lamps.

* The unseen monster in ''Fanfic/MotherOfInvention'' is never active during the day, from which Applejack correctly deduces it is vulnerable to bright light. [[spoiler:This enables her to finally defeat it by restoring the power to the underground facility where it hides.]]
* In ''Fanfic/{{Nosflutteratu}}'', Fluttershy explains that sunlight weakens vampires preventing them from using abilities like transforming into a bat.

* ''Fanfic/PrincipalCelestiaHuntsTheUndead'': Ghasts are a form of undead that are particularly vulnerable to light - full exposure is almost always fatal in a very short time, unless they can get out of it quickly enough.

* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fanfic ''Fanfic/TheLongEventide,'' this is shown to be a weakness of the ponies who are part of the Umbral Society. One is shown fleeing a sunrise in the first chapter, and another screams in pain when willingly stepping out the protection of the [[AlwaysNight Shroud]] that surrounds the titular city-state of Eventide.

* ''Film/EmbraceOfTheVampire2013'': Have stabbed the vampire through the hear with with a sharpened cross, Charlotte finishes him off by ripping down the curtain and exposing him to the direct sunlight: causing to burst into flames.

* ''Anime/{{Pokemon}}'': In "Ghost of Maiden's Peak", Gastly seems unstoppable, but when the sun rises, he says he can't stand the sunlight and retreats.