biomech,a massive biomechanical gothic cathedral standing under a dark stormy alien sky, the entire architecture is built from colossal interlocking rib cages and curved spinal columns made of polished black stone and bone, a dark river of glossy black liquid flowing out from the main entrance, eerie green bio-luminescent fog rising from the ground, cinematic wide shot, volumetric light beams, photorealistic, 8k, masterpiece