PvP Arena with Classes

I made a floating PvP Arena for you to Enjoy! There are 6 different classes in this minigame. There are the following classes:
Gladiator (Great Defence, Average Attack, Average Speed.)
Berserker (Average Defence, Massive Attack, Slow Speed.)
Alchemist (Bad Attack, Average Defence, Great Buffs, Average Speed.)
Scout (Average Attack, Average Defence, Massive Speed + Jumping.)
Tamer (Bad Attack, Average Defence, Great Wolves, Average Speed.)
Archer (Great Range Attack, Bad Defence, 2 Invisibility Potions, Average Speed.)

There also follows an ingame shop with the map!

Remember to turn monsters on!!! (There is a server.properties file in the download.)

Recommended players: 8, but you can play with 2-16 players.

Follow the Rules!

Additional Notes

Rules are in game.

Please tell me if there is something wrong or I can improve! Thanks! :)