Create a dark fantasy concept art scene of a colossal red dragon coiled tightly around a weathered medieval stone lighthouse on a jagged sea cliff. The dragon has enormous outstretched batlike wings spanning nearly the full width of the image, leathery torn membranes, black horned spines along its head and neck, sharp claws gripping the tower, and a serpentine body wrapped in a spiral around the lighthouse. Its head bends downward beside the tower with a fierce predatory expression, glowing eyes, ridged scales, and wet highlights from heavy rain. The lighthouse is ancient gray stone with small arched windows, ruined battlements and castle-like masonry at its base, and a bright warm lantern glowing at the top, partially encircled by the dragon. Set the scene during a violent thunderstorm at night, with a dramatic purple-black sky filled with multiple branching lightning bolts behind the dragon, diagonal sheets of rain, mist, and storm clouds illuminated from within. Below, huge ocean waves crash against the rocky cliff, sending white spray upward; the sea is dark navy with foaming surf. Add distant rocky silhouettes and faint ruined coastal structures on the horizon for scale. Use cinematic vertical-square composition, high contrast, epic fantasy realism, painterly digital concept art, intricate scale detail, moody violet and crimson color palette, backlit lightning, wet reflective surfaces, volumetric atmosphere, dramatic perspective, no text, no border.