Build a 100x100 Minecraft FFA PvP a...

Build a 100x100 Minecraft FFA PvP arena with an ASTRAL/COSMIC theme. Use only blocks available in Minecraft 1.7.10. Style: cobalt blue, cyan, white, dark gray/black, with quartz, stained clay/glass, stone bricks, obsidian and glowstone. Make the arena mostly open and optimized for fast PvP: clear sightlines, smooth movement, small elevation changes and a few ruins/pillars/rocks for cover. Create a symmetrical circular or octagonal layout with: * large open central fighting area * 4 slightly different quadrants * 6–10 balanced spawn points around the edges * clear arena boundaries * small Astral-themed centerpiece Avoid huge buildings, interiors, mazes, tight corridors, excessive verticality, water, lava, forests or heavy decoration. Priority: PvP gameplay, 1.7.10 compatibility, low