Dark underground cave city. The abundance of dark, archaic and barbaric dark blue architecture, reminiscent of some ancient ruins. Dark blue. Purple mica glistens beneath the surface of an underground river. Violet. The cave is illuminated only by bioluminescent plants. Crimson. It's dark and ominous, but also whimsical and alluring. Deep dark cave deep underground, luminous plants, reflective purple river, ancient ruins carved into the dark blue stone walls of the dungeon. All buildings in the cave hang upside down like stalactites. | Anything