[Free Download] Fantasy Dungeon Background Illustrations (Portrait) — Commercial Use Allowed (Free) for copainter Users

We are offering free fantasy dungeon background illustrations in a portrait 9:16 format. These vertical assets are ideal for smartphone-oriented projects, and light/dark variations are also included, making them especially convenient.

They can be used for webtoons, games, manga, and other projects including advertisements.
Commercial use is allowed, free of charge, and tracing and additional edits are permitted.

Please save and use the images directly from this page.
For licensing details, please check the end of this text.

File Details

• Format: PNG (non-transparent)
• Aspect Ratio: Portrait (optimized for smartphone viewing)
• Resolution: 768 px (W) × 1344 px (H)
• Download: Save each image individually below
  (Note: No bulk ZIP download is provided.)

Fantasy Dungeon Manga / Anime Background Illustrations (Downloadable)

Crystal Lake Cavern | Fantastical Crystal Cave

A subterranean fantasy scene filled with glowing crystals and a clear underground lake, creating a mystical atmosphere.

Luminous Crystal Bridge | Blue Underground River

A mysterious dungeon featuring a stone bridge spanning a softly glowing subterranean river.

Radiant Labyrinth Corridor | Crystal Arches

A fantastical cave corridor where blue and gold light intersect—perfect for exploration or pre-boss scenes.

Dark Crystal Passage | Silent Underground Path

Glowing blue crystals and water reflections pierce the darkness, heightening tension during deep exploration.

Spirit Tree Crystal Approach | Entrance to Ancient Ruins

Roots, glowing runes, and crystal light intertwine, signaling the beginning of a mysterious adventure.

Shadow Crystal Arcane Path | Traces of Ancient Magic

A ritual-like corridor lined with faintly glowing crystals and engraved magic symbols.

Dawnlit Crystal Cavern | Sacred Corridor of Light

Light pours in from above, illuminating blue crystals in a serene cave—ideal for hopeful or sacred moments.

Dim Crystal Hollow | Moonlit Fantasy Space

Crystals glow softly in low light, making this a perfect nighttime dungeon setting.

Stairway to the Sealed Gate | Remains of an Ancient Civilization

A grand stone staircase leading to a massive sealed door, ideal for tense pre-boss encounters.

Dark Sealed Gate Stairway | Forbidden Underground Sanctuary

A shadowy stairway and a purple-glowing gate evoke an ominous, forbidden power.

Sunlit Serpentine Staircase | Cave Ruins Corridor

Light streams into the cavern, dramatically illuminating a winding staircase—great for escape or discovery scenes.

Moonlit Serpentine Staircase | Silent Underground Passage

A blue-toned, shadowy stairway that enhances depth and tension during night infiltration scenes.

Emerald Submerged Temple Courtyard | Ruins with Waterfalls and Crystals

Water channels, small waterfalls, and softly glowing crystals heighten the mystical feel of this dungeon.

Dim Submerged Temple Courtyard | Nightfall Ruins

Low-light waterways and crystal reflections create a quiet, stealth-friendly environment.

Verdant Underground Garden Canal | Labyrinth of Stone Bridges

Moss, flowers, and winding stone bridges form a dreamlike exploration route.

Soft-Lit Underground Garden Canal | Daylight Spirit Cavern

Gentle light and pale flowers create a peaceful atmosphere—ideal for rest areas or safe zones.

Pale Blue Underground Stream Tunnel | Glowing Mushroom Cave

Stalactites and softly glowing plants guide the way through a memorable dungeon corridor.

White-Mist Stream Tunnel | Light-Filled Sacred Passage

A bright, misty cavern with flowing water, well-suited for purification or holy events.

Deep Blue Stone Bridge Waterway | Twin Arch Cavern

Reflections on water and stone arches add depth, perfect for pursuits, ambushes, or encounters.

Twilight Stone Bridge Waterway | Quiet Underground River

Dark tones highlight the waterway and bridge, enhancing nighttime or ominous scenes.

Emerald Underground Aqueduct Ruins | Waterway with Falls and Arches

A moss-covered aqueduct with cascading water, ideal for exploration or chase sequences.

Dark Underground Aqueduct Ruins | Nightfall Waterway Dungeon

Shadowy waterways and echoing falls create suspense for stealth or ambush scenes.

Guardian Statue Pillar Corridor | Ancient Knight Passage

Stone guardian statues line the corridor, majestically framing sealed zones or trial entrances.

Shadowed Guardian Corridor | Silent Statue Passage

Low lighting intensifies tension, perfect for traps or moments before a boss encounter.

Azure Flame Sealing Altar | Circular Chamber and Abyss

An altar surrounded by blue flames and stone statues—ideal for rituals, seal-breaking, or teleportation events.

Dim Sealing Altar | Quiet Circular Chamber

A cold, mysterious stone chamber suited for puzzles or forbidden exploration.

Sunlit Monolith Temple | Vast Underground Hall

Massive engraved pillars dominate this hall, perfect for scenes involving ancient civilizations or discoveries.

Shadowed Monolith Temple | Blue-Dark Ancient Pillar Hall

Deep blue shadows emphasize scale and tension, ideal for pre-ritual or high-stakes exploration.

Azure Flame Demon King’s Throne | Dragon Crest and Summoning Circle

A powerful throne room glowing with magic, suitable for boss battles or final confrontations.

Golden Flame Demon King’s Throne | Ominous Royal Chamber

Warm flames and battle-scarred floors suggest aftermaths, rematches, or climactic endings.

Moonring Crystal Arena | Rune-Carved Circular Arena

Moonlight and glowing runes illuminate this underground arena—perfect for duels or boss fights.

White Moon Crystal Arena | Luminous Underground Coliseum

Bright moonlight reveals crystals and seating ruins, ideal for ritual battles or special events.

Hellfire Cliff Arena | Spires and Chain Cages

A dramatic cliffside arena lit by torches, well suited for trials, executions, or decisive battles.

Golden Torch Cliff Arena | Ancient Fortress Coliseum

Warm torchlight illuminates the stone arena, making it perfect for tournaments or all-out battles.

How to Use with copainter

Mass-Produce Variations with the AI Assistant

Download the images and load them into copainter as reference images. You can easily adjust lighting (day/night), replace skies, or add props to suit your project.

Upscale to 4000px+ with the High-Resolution AI

Use the upscaling feature to increase resolution for production-ready assets.
https://www.copainter.ai/ja/upscaling

Convert into Manga-Ready Backgrounds with the Inking AI

Load images as references in the Inking AI to simplify linework for manga use. Adjust pen styles for unique results.
https://www.copainter.ai/ja/inking

Change Aspect Ratio with the AI Assistant

If an illustration’s aspect ratio doesn’t fit your needs, you can instruct the AI assistant to adjust it.

License Terms

• Eligible users: copainter subscribers
• Permitted use: Free and commercial use allowed only for works created using copainter
• Modifications: Allowed (cropping, redraws, color changes, vectorization, etc.)
• Credit: Not required
• Prohibited: Redistribution or sale of the assets themselves, claiming authorship, commercial use outside copainter
• Disclaimer: The provider assumes no responsibility for any damages resulting from use of these materials.

FAQ

Q. I want higher-resolution materials.
A. Use copainter’s Upscaling AI. You can upscale up to 4× in both width and height, making it suitable for commercial use.

Q. Can I use these outside copainter?
A. If you are a copainter subscriber and use them for works created using copainter, commercial use is allowed and free of charge. Edits using external services are also fine as long as the purpose is to use them in works created with copainter. As long as copainter is used for some part of the production process, it is allowed.

Q. Can I use these in commercial projects?
A. Yes, if the work is produced using copainter, commercial use is allowed. You do not need to create the entire work solely with copainter. Redistribution or resale of the assets themselves is not permitted.

Q. Are there other free pose collections?
A. Yes. Please refer to the following:
https://blog.copainter.ai/tag/assets-en/

If you haven’t used copainter yet, this is a great opportunity—please sign up for copainter using the link below!

You can find copainter Learn, our media hub packed with tips and best practices for using copainter effectively, at the link below.