A luminous underground fantasy city within a vast cavern, featuring stone houses, glowing multicolored crystals, and a gigantic blue crystal floating above an ancient runed arch.

A vast underground city carved into the heart of a massive cavern. Small stone houses with rounded roofs and arched doorways line winding streets and narrow alleys. The cavern walls are studded with glowing gems — yellow, blue, green, and red — casting a soft, multicolored light that bathes the city in an otherworldly glow. Crystals are also embedded along the streets and walkways, serving as natural lanterns. At the center of the city stands a colossal stone arch, ancient and majestic, its surface engraved with intricate runes. Floating just above the arch is a gigantic blue crystal, radiating a serene, powerful light that illuminates the entire chamber. The atmosphere is mystical, serene, and awe-inspiring — a lost civilization thriving beneath the earth. See more