Design a colossal 2500x2500 dark fa...

Design a colossal 2500x2500 dark fantasy castle that is fully functional and highly explorable, with multiple interconnected levels and hundreds of detailed rooms. Include grand halls, throne rooms, libraries, armories, barracks, kitchens, dining halls, bedrooms, vaults, treasure rooms, crypts, prisons, workshops, storage rooms, towers, balconies, hidden passages, secret chambers, spiral staircases, and underground tunnels. Use blackstone, deepslate, polished basalt, and dark prismarine as the primary materials, with quartz highlights and emerald blocks integrated throughout the architecture as a major secondary material. Add gargoyles, statues, waterfalls, glowing green lighting, layered depth, and an ancient, intimidating atmosphere.