A colossal volcanic caldera metropolis built into a massive dormant supervolcano crater, towering obsidian spires with integrated geothermal power channels cascading down crater walls, suspended magma-harvesting platforms where tiny geothermal engineers dwarfed by steam vents navigate between cooling rock formations, sleek thermal gliders riding convection currents through volcanic archways, sky gardens with heat-resistant flora thriving on terraced crater slopes, deep volcanic black and molten amber palette with soft geothermal glow filtering through crater rim, epic upward shot from caldera floor with tiny silhouetted miners on illuminated observation platforms emphasizes impossible volcanic engineering scale, photorealistic, cinematic depth of field