A colossal volcanic megacity built into a massive active caldera formation, towering obsidian spires with magma channels flowing through their cores, suspended glass biodome districts hovering over molten rivers, sleek heat-resistant craft navigating between volcanic arches, sky gardens with heat-resistant alien flora cascading over cooling towers, deep obsidian and molten amber palette with constant eruption glow illuminating impossible pyrotechnic architecture, epic wide shot with tiny silhouetted workers on observation platforms emphasizes impossible volcanic engineering scale, photorealistic, cinematic depth of field