A wide-angle, cinematic shot depicts the Demon King's castle perched precariously atop the jagged peaks of the Obsidian Mountains. The massive fortress is constructed from dark, iridescent black stone, featuring towering spires, sharp gothic arches, and floating fortifications that defy gravity. Below the castle, the mountains are composed of sharp, glassy obsidian shards that reflect a dim, ominous light. The surrounding environment is a desolate wasteland of volcanic ash and swirling dark mists that cling to the mountain bases. The atmosphere is oppressive and majestic, lit by a blood-red celestial glow emanating from a cracked sky, casting deep crimson highlights across the polished black surfaces. The visual style is a high-quality anime illustration with sharp lines, dramatic contrast, and a moody, epic scale.