Create a small ancient colosseum ar...

Create a small ancient colosseum arena. Dimensions: 40x40x15. Style: Overworld Ruins, Mossy Stone Bricks, polished Diorite, Iron Bars. Features: - Circular battle floor (radius 18). - Clean flat ground (no holes or lava). - 4 broken stone pillars near edges. - Central small pedestal with a Beacon beam. - Bright lighting (Lanterns/Sea Lanterns). - NO roof. Strictly bounded 40x40 blocks.