Rhodless/Akira-Arena — reverse-engineered prompt

Build me a Minecraft Spigot 1.8.8 arena plugin in Java. I want server owners to be able to run arena matches, track player stats, show rankings and leaderboards, and keep the data safe in MongoDB so it still works well as the server grows.

Please make it feel like a real finished plugin, not just a demo. Players should be able to join and play arenas, see their rank or stats, and admins should have simple ways to manage the arena system. Also include a clean developer API so other developers can add custom roles and powers without rewriting the whole plugin.

Set it up as a Maven project that builds into a working Spigot plugin jar. Keep the code organized and easy to extend, with sensible defaults and clear places to change settings. Since this is for old Spigot 1.8.8, look up the correct docs or compatibility details online if you need to.