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: <code>jundrct, a market hall carved in blue ice, ornate brass stalls, lanterns, a crowd of adults</code>- Describe the room. The LoRA brings the warmth and the brass; your words bring the details.- Negative: <code>window, daylight, sky, sun, oversaturated</code>. 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 made240 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: <a target="_blank" rel="ugc" href="https://signalofsolarum.substack.com">https://signalofsolarum.substack.com</a> · <a target="_blank" rel="ugc" href="https://www.deviantart.com/signalofsolarum">https://www.deviantart.com/signalofsolarum</a>

Solarum Undercity XL — warm brass, lanterns and blue ice for underground halls (SDXL)

First release. Trigger <code>jundrct</code> at 0.8. Put <code>window, daylight, sky, sun</code> in the negative. Strongest on ice halls, shafts and lantern-lit rooms; weak on steam and iron.

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