Build a detailed 500×500 circular f...

Build a detailed 500×500 circular fantasy PvP arena surrounded by tall bedrock walls, featuring four naturally blending biomes without separators: Crystal/Amethyst, Mesa/Badlands, Crimson/Mushroom, and Dark Forest. Each biome must have richly textured terrain using varied blocks, vegetation, decorations, formations, and elevation changes, never flat single-block quadrants. Add a floating circular crystal-themed spawn platform above the center, dramatic nighttime atmosphere, and sufficient lighting. Ensure safe spawning, normal multiplayer respawning, a fully generated Overworld, and a tested, playable world.