Backrooms Subway One-Take Horror
An extremely detailed prompt for generating a 30-second one-take video of a Chinese subway train entering Backrooms-like liminal spaces, referencing uploaded images for scenes and monsters.
Prompt
Seedance2.5 Backrooms Train Prompt:
Please strictly refer to all images uploaded in this session to generate a 30-second, 16:9 landscape, hyper-realistic, cinematic-grade, true one-shot video, compatible with Seedance 2.5. The theme is "A Chinese city rush-hour subway train, while maintaining normal high-speed operation throughout, unexpectedly enters a Backrooms/Liminal Space system that continuously invades reality, constantly changes, and becomes increasingly impossible." Please strictly distinguish the usage of the images: The first five images are the only visual references for the five main scenes, corresponding sequentially to [Classic Yellow Level 0], [Office Dark Forest], [Fake Sky Residential Area], [GET OUT Endless Dark Lawn], and [Ultimate Poolrooms/Flooded Water Hall]. The last three images are references for abnormal creatures. Among them, the two key entities responsible for "close-range face-jump/window-hitting scares" are only the Black Slender Monster and the White Eviscerated Monster; the Yellow Hazmat Suit Monster is used only as a distant static observer or mid-to-far distance abnormal silhouette, not responsible for the main window-hitting scare.
Highest Priority Rule 1: All five main scene images I uploaded can only be understood as "local visual samples within a huge continuous world." You absolutely cannot treat the reference image itself as a complete scene to stop and display there, nor can you directly paste the reference image outside the train window as a static background. The model must automatically extend into a complete 3D world hundreds of meters or even boundary-less, along the direction of train movement, the direction already passed by the train, and the depth of space, based on the architectural materials, structure, lighting, color, abnormal elements, and spatial language of each image. For example, Yellow Level 0 must be expanded into a huge yellow maze composed of dozens or hundreds of rows of yellow pillars, corners, doorways, low fluorescent lights, yellowed wallpaper, and old carpets; the Office Forest must be expanded into a huge office forest composed of hundreds of meters of continuous acoustic panel ceilings, office pillars, checkerboard floors, tree roots, tall grass, shrubs, and giant trunks; the Fake Sky Residential Area must be expanded into a complete community composed of many continuous residences, lawns, sidewalks, mailboxes, streetlights, and an infinite office ceiling above; the GET OUT Dark Lawn must be expanded into a huge wet grass space without normal sky or horizon; Ultimate Poolrooms must be expanded into a huge water hall system composed of many continuous white tile pillars, pool rooms, doorways, railings, steps, platforms, water channels, semi-submerged corridors, and deep water areas. Reference images only define "the visual language and structural logic of the world," they absolutely do not define "displaying this entire image completely."
Highest Priority Rule 2: From the first frame at second 0 to the last frame at second 30, the train must always maintain exactly the same high-speed gear. There should be no starting, accelerating, decelerating, stopping, hovering, or slowing down to showcase wonders. The speed cannot decrease due to monster appearances, scene changes, flood arrivals, or entering Poolrooms. The entire video must always look like a real Chinese city rush-hour subway train rushing forward at a fixed normal high speed.
Highest Priority Rule 3: The external motion direction throughout the film must always be consistent, it must be the same direction. It absolutely cannot suddenly reverse after crossing scenes, nor can there be errors like reversing, pulling back, shuttling backward, or sudden left-right direction reversals. Please explicitly lock: All near-view, mid-view, far-view objects outside the window, occluders, water flows, and monster passing directions must uniformly sweep from the left side of the screen to the right side at high speed; the same train, same forward direction, same outside-window sweeping direction cannot change from beginning to end. Any near-view object within 1-5 meters of the window, including pillars, wall corners, door frames, tree trunks, residential walls, streetlights, road signs, grass edges, tile pillars, railings, pool edges, handrails, huge doorway edges, and churning water walls, must fly past the window continuously from left to right at very fast horizontal speed, producing real, direction-consistent high-speed motion blur. It cannot just let one object pass; multiple groups of similar structures must appear continuously, e.g., the first pillar passes, the second pillar immediately follows, wall corner passes, door frame passes, third row of pillars continues to pass. Mid-view buildings must always continue to recede noticeably, and far views must also continue to shift backward, but because the distance is farther, the screen displacement amplitude is smaller. This difference can only come from real parallax, and must absolutely not imply the train is slowing down.
Highest Priority Rule 4: The entire 30 seconds must be a true one-shot. There can only exist the same camera, the same 24mm wide-angle lens, the same adult eye-level fixed position, the same shooting axis, the same real Chinese city subway car, the same large side window, the same window frame, and the same batch of passengers. The camera is fixed at adult eye-level height at the rear of the car, slightly angled towards the front of the car. About 65%-70% of the left side of the screen is always the same large side window and the abnormal world outside, while about 30%-35% of the right side always retains the interior of the same real car, including passengers, handrails, straps, top lights, seat edges, door frames, and door structures. Absolutely prohibited: cutting shots, hidden editing, changing cars, changing windows, changing positions, changing focal length, re-composing, moving camera closer to glass, window frame disappearing, side window becoming front window, full-screen blackouts, full-screen white flashes, Morph, digital dissolves, portals, space melting, and game-level style scene changes.
Highest Priority Rule 5: Transitions between different scenes must be completed through "real space evolution + giant object full-window occlusion," being both natural and impactful, not simply A ending and B appearing. Each transition must first allow the next scene's material, structure, lighting, or terrain to grow out from within the current scene, then have a huge near-view structure or huge moving entity completely occlude the entire window, and naturally expose the new scene when the occlusion leaves. Occluders usable for transitions include: giant concrete tunnel walls, yellow giant pillars, collapsed walls, giant tree trunks, residential exterior walls, streetlight poles, backs of road signs, entire pure black structural walls, giant tile pillars, pool walls, and entire churning floods. Occluders must also obey the same direction rule, uniformly sweeping from left to right at high speed across the window, and absolutely cannot reverse due to scene changes.
Highest Priority Rule 6: Each main scene must possess its own internal "process of change," not a fixed background. As the train passes at high speed, the space outside the window must also continuously invade, crack, darken, grow new structures, accumulate water, rise/fall, collapse, or expand.
Highest Priority Rule 7: The two monsters responsible for the main scare tasks—the Black Slender Monster and the White Eviscerated Monster—must both have clear "face-jump/window-hit" effects. They are the two abnormal entities most likely to scare passengers and viewers in the whole film; however, their appearance methods must still differ somewhat, not being exactly the same. The Black Slender Monster is more suitable for silent, abrupt, shadow-like sudden approach to the entire window, focusing on eeriness and oppression; the White Eviscerated Monster is more suitable for strong close-range explosive window-hitting or tapping, focusing on physiological shock. The Yellow Hazmat Suit Monster only appears as a distant/mid-ground static observer, does not perform face-jumps, and does not hit the window.
Highest Priority Rule 8: The car must be a very realistic weekday evening rush-hour subway car in a Chinese first-tier or new first-tier city, with about 20-30 ordinary Chinese commuting passengers, mostly Chinese people, both male and female, primarily ordinary white-collar workers, students, and office workers aged 20-45. They wear shirts, T-shirts, thin jackets, hoodies, ordinary pants, sports shoes, and commuter shoes. Some carry backpacks, shoulder bags, canvas bags; some hold phones, wear earphones, hold thermos cups; some sit, some stand holding handrails and straps. Characters must be natural and real, not looking like models or extras. At second 0, most people are in ordinary commuting states, looking down at phones, wearing earphones, spacing out, leaning against handrails; as abnormalities gradually escalate, a few people first look up, frown, remove one earphone, stop scrolling phones, lightly touch companions, silently raise phones, grip handrails tightly; when the Black Monster or White Eviscerated Monster performs face-jumps/window-hits, nearby passengers must have corresponding reactions, such as body jerking back, phone almost dropping, instinctively raising hands to block, short startled cries, quickly looking outside the window, moving closer to neighbors, but overall still maintaining realistic restraint. Prohibited: synchronized screaming of the whole car, collective running around, exaggerated horror movie acting.
Specific time structure is as follows:
0-0.5 seconds: Real Chinese city only flashes briefly. The train is already running at high speed from the first frame. Outside the window, sound barriers, elevated bridge piers, high-rise residences, ordinary office buildings, and a small amount of Chinese urban streetscape flash quickly. Near structures sweep rapidly from left to right. Do not establish a comfortable real environment.
0.5-2 seconds: The train rushes into a real Chinese subway tunnel at the exact same high speed. The transition from the real world to the Backrooms world must be richer, not monotonous, not just entering a normal tunnel. Initially, it is still gray concrete tunnel walls, pipes, cable troughs, maintenance lights, inspection doors, and niches sweeping continuously at high speed, but soon the tunnel begins to be invaded by the Backrooms: Ordinary maintenance lights are gradually replaced by rectangular office fluorescent lights; behind some inspection doors, yellow wallpaper and old carpets flash briefly; yellowed walls, office pillars, and low fluorescent lights that shouldn't exist gradually appear on concrete walls. The real tunnel seems to be swallowed, covered, and grafted from within by another world. Finally, a huge close-range tunnel concrete wall sweeps completely across the window from left to right at high speed, covering the entire window. After the wall leaves, the real tunnel has thoroughly evolved into the huge yellow Level 0 corresponding to Reference Image 1.
2-6.3 seconds: First Main Scene: Classic Yellow Level 0. This must be a huge yellow maze extending continuously for hundreds of meters. Rows of yellow pillars, wall corners, doorways, low fluorescent lights, yellowed wallpaper, and damp old carpets constantly sweep from left to right at high speed. This scene must continuously change internally: Upon entry, it is relatively intact, then cracks appear increasingly on carpets and floors, parts of the floor arch up, break, sink; wall corners begin to become damp, blacken, and mold; some fluorescent lights start flickering and extinguishing; the first batch of tree roots, wet grass, and tiny plants grow from cracks. The Yellow Hazmat Suit Monster can appear for the first time in this segment, but only as a distant static observer: It stands between a group of yellow pillars, or deep inside a distant doorway, body facing the car, almost motionless, only chopped up by foreground pillars repeatedly, flashing in and out, creating a sense of being watched. The Black Slender Monster takes on the first true "face-jump/window-hit scare" in the latter half of this scene: Initially it only appears once or twice among distant/mid-ground pillars, like an unnatural black vertical shadow. Then, after a giant pillar sweeps past, it suddenly presses very close to the outside of the window, almost filling more than half the window surface with its entire black face or upper body instantly, silently looking into the car, as if the entire face/head is pressed directly against the glass. But it does not stay long, does not repeatedly hit the window, but under the train's continuous high-speed advance, it merely completes one extremely short, abrupt, terrifying face-grazing sweep, and is immediately flung backward by the high speed. Passengers by the window will be visibly scared, bodies jerking back, phones almost slipping, someone looking up stunned. The end of this scene must naturally transition to the second scene according to your requirements: Ground cracks deepen rapidly, tree roots become thicker, real trees begin to grow from broken ground, yellow carpets are torn apart by wet mud, tall grass, and tree roots, fluorescent lights dim overall, yellow pillars are gradually occupied by a real forest. Finally, several giant tree trunks, thick tree roots, and a collapsed section of yellow wall-pillars sweep continuously from left to right across the window at high speed, completely covering the window. After the occlusion leaves, enter the second scene.
6.3-11.8 seconds: Second Main Scene: Office Dark Forest. Must be expanded into a continuous office forest hundreds of meters long. Above is still acoustic panel ceilings, rectangular fluorescent lights, vents, and fire sprinklers; below is checkerboard floors, wet mud, standing water, tree roots, tall grass, shrubs, and many real tree trunks. Multiple tree trunks, office pillars, wall corners, and shrubs sweep continuously from left to right at high speed. This space must continuously change internally: Upon entry, office structures still occupy a high proportion, then lights become darker, ceilings gradually missing, tree density increasing, grass getting taller, tree roots crawling over office pillars and walls, the office becoming more and more like it is completely swallowed by a dark forest. No main window-hitting monster is arranged in this scene, leaving the scare focus for the two main monsters before and after, but the Yellow Hazmat Suit Monster can appear once more in the depths, still only distant static or slowly turning head, not approaching. The latter half of the second scene must reflect the feeling of "the train starts to slowly go uphill, or drive upwards, or like a brief drop followed by continuing upward charge," but the train speed remains completely unchanged, no deceleration. Express height changes through vertical parallax changes of ground outside window, tree trunks, and pillar rows: The ground line and building baseline outside the window begin to tilt and rise, the space seems to enter an upward track or slope. Then, sidewalks, trimmed lawns, mailboxes, streetlights, and residential roofs gradually appear between trees. The Office Forest and Residential Area briefly coexist. Finally, use a close-range giant tree trunk, a residential exterior wall, and a streetlight pole to sweep continuously from left to right at high speed across the entire window, forming a natural full-window occlusion. After the occlusion leaves, enter the third scene.
11.8-16.8 seconds: Third Main Scene: Fake Sky Residential Area. Strictly refer to Image 3 and expand into a huge continuous community. Dozens of low-rise residences, lawns, sidewalks, mailboxes, shrubs, and streetlights retreat continuously at high speed along the train's direction of travel. But the truly eerie part is that there is no sky overhead, only a vast infinite office ceiling, dense rectangular fluorescent lights, and vents. This scene itself must also change: Upon entry, residences are relatively clear, then cold white fog gets heavier, distances between residences become increasingly abnormal, lights in some houses go out, streets are empty, office lights above begin to lose brightness in patches, the entire community gradually transforms from "eerie residential area" to "uninhabited area swallowed by darkness." The Yellow Hazmat Suit Monster is most suitable here as the only clearly visible distant observer: It can stand at the door of a house, edge of a lawn, distant intersection, or between two streetlights, quietly looking at the car, not approaching, not chasing, not hitting the window. More and more passengers look outside the window, some raise phones, some wake up neighbors. The transition from the third scene to the fourth scene must conform to your idea: Overall lighting dims. Along the train's forward direction, office lights above turn off row by row, houses disappear one by one into thick fog and darkness, residences and streetlights reduce rapidly, finally leaving only wet grass and boundless pure black. Then, a close-range streetlight pole, a residential side wall, and a whole sheet of window-pressing pure black structural wall sweep continuously from left to right at high speed, completely blacking out the entire window. After the dark structure leaves, enter the fourth scene.
16.8-22.2 seconds: Fourth Main Scene: GET OUT Endless Dark Lawn. Refer to Image 4, but must be expanded into a huge wet grass space with no sky, no clear boundaries, no normal horizon. The GET OUT road sign is only a brief near-view element swept past when the train passes at high speed, it must fly out of the frame quickly; the lonely slide in the distance is only an abnormal far-view element, not staying for a long time. This space must continuously change internally and gradually enhance the horror feeling: Upon entry, it is mainly dark wet grass and some shallow puddles, then wind strengthens, blades of grass begin to topple and sway in sheets, more puddles appear and connect, ground reflections get stronger, larger standing water surfaces and flowing ripples appear between grass patches. The White Eviscerated Monster takes on the second and strongest "face-jump/window-hit scare" of the whole film in this scene: It initially does not approach immediately, but appears intermittently in the darkness, e.g., briefly standing behind a road sign, near a slide, or deep in the grass, swallowed by darkness then briefly revealed. Then, when the train approaches at high speed and a huge close-range dark grassy slope or structure sweeps past, it suddenly lunges at the window from very close side-front, its entire upper body or twisted face instantly pressing against the glass, possibly accompanied by one clear tap or impact action on the glass, causing slight vibration, but it can only happen once, repeated lunges are not allowed, lying on the glass for a long time is not allowed; since the train continues at high speed, it is immediately flung backward after completing this strongest scare. Nearby passengers will show the most obvious startled reactions: Someone jerks back violently, phone almost drops, standing passengers grip handrails tightly, someone lets out a short cry, someone instinctively hides behind a companion, but the car overall still maintains realistic restraint. After the window-hitting scare, standing water in the dark grass increases rapidly and starts losing control, large amounts of churning water appear in the distance and mid-ground, as if a great flood is approaching from the dark depths. This scene naturally transitions to the fifth scene according to your requirements: Suddenly, massive amounts of floodwater surge horizontally from the side-front or deep within the space, water churning, splashing, surface rolling continuously, forming a huge water wall sweeping completely across the window from left to right at high speed, fully covering the entire outside-window area. This big flood transition must be very impactful.
22.2-30 seconds: Fifth Main Scene: Ultimate Poolrooms/Flooded Water Hall. After the flood water wall leaves, the previous flood must naturally evolve into the pool water inside this new world, rather than looking like a sudden cut. Strictly refer to Image 5 and expand it into a huge, incomprehensible continuous Poolrooms system: Hundreds of small white square tile pillars, multi-layered pool rooms, huge doorways, railings, steps, platforms, semi-submerged corridors, narrow water channels, light cyan pool water, and some nearly black deep water areas, continuously sweeping from left to right at high speed. The train maintains exactly the same high-speed gear from entry to end as at the beginning; final scene sudden acceleration is not allowed, nor is decelerating for viewing. This scene must continuously change internally and become scarcer: Upon entry, pool rooms are relatively regular, then water levels rise continuously, more and more steps, lower doorways, and corridors are swallowed by water, larger multi-layered pool rooms unfold in the distance, new water flows continue to surge from some high doorways, water surface changes from relatively calm to constantly showing waves, backflows, churning, and strong reflections, some deep water areas become darker and darker, like bottomless wells, larger new spaces are constantly revealed behind giant tile pillars. No new window-hitting scares are arranged in this scene to avoid repetition; if a monster needs to appear again, only allow either the Black Slender Monster or the White Eviscerated Monster to appear in a more restrained way, e.g., standing silently only in a distant doorway, or appearing as a blurry black shadow outline only under deep water, or revealing half a body behind a giant tile pillar. Absolutely no repeating face-jumps to avoid repetitive techniques. At this point, most passengers in the car have stopped their original commuting behaviors. Some grip straps tightly, some hold phones but forget to shoot, some silently move toward the center of the car, some stare death-like out the window from between other passengers' shoulders. External pale watery light constantly reflects on passengers' faces, window glass, stainless steel handrails, and car walls. At the end of 30 seconds, the train is still rushing at exactly the same high speed as at seconds 1, 5, and 10, towards deeper, larger, darker Poolrooms. It ends directly, no stopping, no decelerating, no blackout, no fade-out, no destination appearing. The overall texture must look like "a real camera accidentally recording an impossible architectural world." It must have real Chinese subway materials, real human skin, real glass reflections, glass smudges, fine dust, fingerprints, slight water marks, real fluorescent lights, slight flickering, old walls, old carpets, real bark, real grass blades, real residences, white tiles, water reflections, rust, mold traces, moderately restrained photographic grain, natural dynamic range, and real directional motion blur. Absolutely prohibited: Slow sightseeing, train deceleration, reverse motion, direction reversal after scene switching, any scene being displayed statically, static backgrounds, reference image pasting, slideshow feel, complete Scene A suddenly becoming complete Scene B, game level feel, cyberpunk, neon, HUD, UI, magic circles, portals, obvious CG, Unreal Engine texture, cheap VHS glitches, camera position changes, window frame disappearance, changing cars, changing positions. Ultimately, the entire 30 seconds must present as: A completely normal Chinese evening rush-hour subway, with unchanging high speed, unchanging forward direction, unchanging outside-window sweeping direction, charging from a tunnel gradually eroded by the real world into Level 0. Level 0 ground cracks and grows tree roots and darkens overall. Giant trees cover the window, then enter the Office Dark Forest. The train produces obvious uphill/height changes without decelerating and naturally drives into the Fake Sky Residential Area. The residential area's lights and space are swallowed by darkness, then entering the GET OUT Dark Lawn. The White Eviscerated Monster completes one strongest close-range window-hitting scare. Subsequently, a great flood sweeps the entire window and naturally evolves into Ultimate Poolrooms. In the whole film, the Black Slender Monster and White Eviscerated Monster respectively undertake the two strongest face-jump/window-hit scares, while the Yellow Hazmat Suit Monster is always just a distant observer; the same subway, same passengers, same window, same position, same speed, same motion direction, never reversing, never stopping from beginning to end.
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