In my world, Solarum, the Undercity lies under the ice of Enceladus, Saturn's venting moon. The heat comes up free from below, so the basement is where the warmth is: brass and ironwork, lanterns, velvet and copper stills, markets carved into blue ice. This LoRA builds those rooms.
What it does: turns interiors into warm underground halls: hanging brass lanterns, carved arches, rich patterned walls, copper everywhere, and (its best trick) market halls and shafts carved in blue ice. It works on rooms it never saw: a bedroom or a kitchen comes out in the same warm, lantern-lit world.
How to use it
- Weight 0.8. Start from: jundrct, a market hall carved in blue ice, ornate brass stalls, lanterns, a crowd of adults
- Describe the room. The LoRA brings the warmth and the brass; your words bring the details.
- Negative: window, daylight, sky, sun, oversaturated. It's underground: windows and sunsets sneak in otherwise.
What it can't do (yet)
- Steam barely shows. Iron structure (girders, catwalks) is weak.
- Glowing fungus in the walls is rare. Say it in the prompt if you want it.
- Colour runs hot at 0.9 and above.
- Bars come out empty unless you ask for people.
How it was made
240 pictures rendered from 12 scenes from my novel (the bar, the stage, the dressing room, an ice market, a flooded tunnel, a ladder shaft…), with Juggernaut XL alone and with two of my own LoRAs. I kept the 74 that looked like the Undercity, threw out anything with daylight, and captioned each with just a few plain words, so the trigger carries the look. No other people's art, nothing from Flux / Google / OpenAI.
Training: Juggernaut XL v9 base, kohya sd-scripts, LoRA dim 32 / alpha 16, UNet only, 1024 px buckets, AdamW8bit, cosine, LR 1e-4, 10 repeats, released epoch 4 of 6 (740 steps).
Made with Claude (Anthropic): Claude Opus 5.5 in Cowork planned the method and picked the set; Claude Code with Claude Sonnet 5.5 on my desktop ran the renders and training.
More: https://signalofsolarum.substack.com · https://www.deviantart.com/signalofsolarum
Description
First release. Trigger jundrct at 0.8. Put window, daylight, sky, sun in the negative. Strongest on ice halls, shafts and lantern-lit rooms; weak on steam and iron.