Surreal subterranean city of iridescent humanoid beings

A subterranean metropolis of iridescent humanoids thrives amidst a kaleidoscope of emerald, amethyst, and ruby hues, its architecture blending gothic grandeur and surrealist whimsy with intricate copper pipes, crystal spires, and glowing ethereal orbs amidst a geothermal energy fueled world reminiscent of Lucas Cranach's visionary style and Remedios Varo's surrealist landscapes merged with the primal forces of the planet's core, where dreamlike machinery hums with an otherworldly power.