Floating island PvP arena, Atlantis...

Floating island PvP arena, Atlantis sunken city theme, 150-300% size. Main island with water channels, coral, and glowing flora. Structures with rooms and exits: 1) Grand Palace (30x25) with main hall, 4 side chambers, front archway, side colonnade exits, and upper observation deck — center, 2) Crystal Observatory (dome 20 diameter) with interior platform, spiral ramp, 3 glass window exits, and basement tunnel — east, 3) Coral Gardens with 3 small ruined shrines (each 8x8, one room, 3 open arch exits) — west, 4) Sunken Market (20x15) with central fountain, 6 vendor stalls, covered walkways, and 4 open exits — south, 5) Temple of Poseidon (15x15, 2 stories) with altar room, upper balcony, front steps, and rear underwater tunnel exit — north. Use prismarine, sea lanterns, cyan and light blue