History Main / LivingStructureMonster

** The [[VideoGame/DevilMayCry2 second game]] has Nefasturris, the "Tower of Sin", an enormous demon which is summoned into the human world using an entire skyscraper as a conduit.

** The Living Wall, which gains power by assimilating nearby corpses, was a [[DownplayedTrope downplayed]] example, the material specifically stating that it was limited to a single section of wall.
** First Edition had the "Lurker Above" (just called the Lurker in ''Advanced D&D''), which resembled the ceiling.
** Its counterpart, the Lurker (renamed the Trapper when the LA had the "above" dropped) disguised itself as the floor.
** Combine those three with the Gelatinous Cube, which is transparent enough to pose as the ''empty space'', and you can construct ''literally'' the entire room from disguised monsters.
** Second edition had the "Greater Mimic", a larger version of the game's resident ChestMonster which could impersonate rooms or other structures.
** An even-stronger [[KingMook unique individual]] of the aforementioned Greater Mimic returned in the 4th-edition supplement “Threats to the Nentir Vale”, known as the [[https://www.wizards.com/dnd/files/excerpts/intheworks_20110404_3.pdf Wandering Tower,]] which can not only disguise itself as [[SapientHouse any two-story structure]], but is also aided in its hunts by a group of devious Mirror-Mimics who can [[FaceStealer imitate anyone they bite]] and a flock of vicious [[FeatheredFiend Blood Ravens]] which feed on the Mimics’ leftovers but are not above killing prey for themselves. The Wandering Tower’s preferred way to obtain a meal is to have its Mirror Mimic minions invite unsuspecting travelers inside, and then, once they’ve been lured into a false sense of security, expose its [[EldritchAbomination central core]] to devour them alive, preferably in their sleep. If the prey fights back, [[MalevolentArchitecture the walls themselves transform into hellish masses of claws, tentacles, and fanged mouths]] to try to hold them in place. The Tower and its minions are [[ItCanThink intelligent]] enough to take advantage of adventurers’ {{Greed}} by offering up the possessions of its past meals as incentive to enter its waiting maw.

** One of the weirdest is the spanner, which is a monster that looks exactly like a stone bridge and can be found stretched across rivers and chasms. They have the ability to speak will allow people to walk across them with some convincing. If you try to cross one that doesn't want you to, it will try to throw you off or open a hole in its body to make you fall through it.

* In ''Manga/AttackOnTitan'', it is revealed at the ending of the anime/midpoint of the manga that the walls surrounding their CityInABottle are actually living creatures. [[spoiler:As in, the walls are made of Colossal Titans' hardened InstantArmor... with the aforementioned titans ''inside'' the walls as foundations. Said Titans turned out to be commanded by King Karl Fritz, an Eldian king of long ago, who set up the walls to protect the last surviving Eldians during the war -- and the Titans within as a weapon against the rest of the world should they attack them again, which are ultimately unleashed by Eren in an event called the Rumbling]].

* In ''Manga/AttackOnTitan'', it is revealed at the ending of the anime/midpoint of the manga that the walls surrounding their CityInABottle are actually living creatures. [[spoiler:As in, the walls are made of Colossal Titans' hardened InstantArmor... with the aforementioned titans ''inside'' the walls as foundations.]]

* In ''VideoGame/StarCraft,'' all Zerg structures are actually sessile Zerg organisms; based on the instinctive nests of each creature assimilated by their ecosystem, and grown from their WorkerUnit.

* In the ''WesternAnimation/AdventureTime'' episode "All Your Fault", the Lemongrabs have produced their own children, one of which, Lemonjon, is so big he takes up much of the castle, and his body is intertwined with the building.

* In ''VideoGame/StarCraft,'' all Zerg structures are actually sessile Zerg organisms; based on the instinctive nests of each creature assimilated by their ecosystem, and grown from their WorkerUnit

* ''Series/TheOuterLimits1995'' used this trope in "If These Walls Could Talk", when what at first appears to be a HauntedHouse turns out to have been brought to life by a former owner's tinkering with enzymes from space. At least, he'd been tinkering until the house [[ToServeMan got hungry]].

** ''VideoGame/FinalFantasyVII'' has Hell House, a fairly dangerous random encounter that first appears as an ordinary house, before revealing mechanical limbs, head, and weapons.
*** The [[VideoGame/FinalFantasyVIIRemake remake]] changes it into a scripted MiniBoss encounter instead.

* Several ''Franchise/TheLegendOfZelda'' games contain enemies called [[http://zeldawiki.org/Flying_Tile Flying Tiles]]. From a distance they're just ordinary floor tiles, but as you approach they levitate up, start spinning, then hurl themselves at you. ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' has living fake doors that attack Link if he approaches them. As some of them are in front of the ''actual'' doors, it's a good thing a bomb can deal with the issue.

* In ''Literature/IBecameTheDemonLordSoICreatedADungeon'', we have a rare protagonist example. Yuki is a human from Earth reincarnated into a Demon Lord and bound to a dungeon. The dungeon is a living being and both it and he are dependent on each other to live.

* In ''LightNovel/IBecameTheDemonLordSoICreatedADungeon'', we have a rare protagonist example. Yuki is a human from Earth reincarnated into a Demon Lord and bound to a dungeon. The dungeon is a living being and both it and he are dependent on each other to live.

** Thanks to Big Mom's SoulPower, ''anything'' in her territory can become an AnimateInanimateObject; This includes doors. They won't open unless they want to.

** In the [[VideoGame/DevilMayCry1 first]] [[VideoGame/DevilMayCry2 three]] [[VideoGame/DevilMayCry3DantesAwakening games]], the blocked doors would attack Dante if you got too close, but otherwise left you alone until you got rid of them by solving a puzzle and/or killing some enemies.

* Zehnoa, one of the bosses in ''VideoGame/TrialsOfMana'', is a demonic fireplace/furnace that attacks by spitting enemies out of its fire.

** In the first three games, the blocked doors would attack Dante if you got too close, but otherwise left you alone until you got rid of them by solving a puzzle and/or killing some enemies.
** The second game has Nefasturris, the "Tower of Sin", an enormous demon which is summoned into the human world using an entire skyscraper as a conduit.

** Stonjourner from ''VideoGame/PokemonSwordAndShield'' is a Pokémon resembling a Stonehenge formation. Its ''Shield'' Pokédex entry says that once a year at a certain time, multiple Stonjourner gather out of nowhere and form in a circle.

* The Ultra Beast Stakataka from ''VideoGame/PokemonUltraSunAndUltraMoon'' takes on the appearance of a castle tower. Each of the individual "stones" is actually a separate life form with an inward-facing eye, hence its code name, "UB Assembly".

* A rather well renowned {{youkai}} from Japanese folklore called a {{Nurikabe}} is an animated wall that impedes travelers. It is the basis for many characters such as the Whomps from ''Franchise/SuperMarioBros'' and the Monol monsters from ''Videogame/MonsterRancher''. Interesting enough, its common depiction of being an animated wall is somewhat of [[NewerThanTheyThink a modern representation]]. Originally during the Edo period, one of its early depictions was that of a three-eyed grotesque vaguely dog-like creature. Over time, its depiction changed to a literal wall with limbs and very vague features.
* Another {{youkai}} is the Mokumoku-ren which is a monster created from shoji, the paper sliding doors and windows found in Japan houses. When shoji are not taken care of, they can become riddled with holes. If not repaired for a long time, these can become infested with [[EyesDoNotBelongThere eyes]]. The Mokumoku-ren is generally creepy but relatively harmless. It is however usually a sign of a greater infestation of youkai in a household.

* In ''WesternAnimation/DofusTheTreasuresOfKerubim'', Louis is a [[OurDemonsAreDifferent Shushu]] possessing a whole house, and is able of manipulating rooms, floors, corridors, doors and furniture inside as he wish. He can also sprout spider legs to move around. He serves as Kerubim's shop for the time being.

** In the first game, the blocked doors would attack Dante if you got too close, but otherwise left you alone until you got rid of them by solving a puzzle and/or killing some enemies.

* Several ''Franchise/TheLegendOfZelda'' games contain enemies called [[http://zeldawiki.org/Flying_Tile Flying Tiles]]. From a distance they're just ordinary floor tiles, but as you approach they levitate up, start spinning, then hurl themselves at you. ''VideoGame/OcarinaOfTime'' has living fake doors that attack Link if he approaches them. As some of them are in front of the ''actual'' doors, it's a good thing a bomb can deal with the issue.