A colossal ancient celestial marketplace city carved into massive floating crystal shards in an eternal twilight dimension, towering prismatic market stalls with glowing merchandise displays, ancient crystal Merchant Guild halls with stained glass windows depicting cosmic events, soft amber and violet light refracting through crystalline structures illuminating winding crystal staircases, tiny hooded traders riding luminescent spirit birds between floating crystal platforms, deep cosmic indigo and mystical violet color palette with warm golden torchlight accents, enigmatic trading mood, dramatic diagonal composition with crystal spires ascending through twilight mists toward distant twin moons, epic cinematic Lord of the Rings scale, hyper-detailed matte painting, 8K fantasy art