I have a server and this is one of the things me and my friends (shengy14, Ninjanomkey512, mastermind_ootm) built on our server. It is a PVP arena with many biomes include mountain, ocean, island, wasteland, end, nether, grassland, desert, and jungle. It is about 50 by 50, with six kits to chose from. You choose a kit and put yourself on adventure and click the button to fight. It takes you to one of the four random teleporting locations, where you fight. As if that is not enough, there are numerous secrets that when you have managed to solve, you will get a reward that will help you with the fight. Be creative, use your smartness, and plunge you enemies into blood.
Have fun!
This arena is in x -2000 y 150 z 2000. You might spawn or respawn off of that, so come to this location. Also, there are multiple other builds that you should not worry about, its from our server.