I hope this will make it onto Pat's and Jen's videos! They're the best!
Features:
-All-Version Support
-A wide variety of arenas to choose from!
-A hidden underground arena
-I will continue to add more arenas!
Notes:
-gamerules, gamemode, traders, lucky blocks, trash chests, and beds are for you to do on your own
-Built in 1.8.9