Create a massive Minecraft castle inspired by Dragonstone from Game of Thrones. Build it from dark volcanic stone on a rugged coastal cliff, with towering jagged spires, layered fortress walls, steep stairways, and dramatic dragon-shaped architecture. Include a grand entrance with carved dragon heads, a central throne hall, courtyards, battlements, bridges, and towers overlooking the sea. Use blackstone, deepslate, basalt, dark stone bricks, and subtle glowing lava accents. Make it ancient, intimidating, highly detailed, and realistically explorable inside. Build only the castle and its immediate rocky foundation.