Auto Arena
BattleArena comes pre-installed with an auto arena module. This module will make it to where when you enter the bounds of an arena, you will automatically be "joined" into the arena. Once you leave the arena boundaries, you will be kicked out of the arena.
Configuring the Module
This module can be enabled by adding auto-arena to the modules section of your Arena Configuration. No other configuration is required from this point, and once BattleArena has been reloaded with /battlearena reload, players will be placed into a competition upon entering arena boundaries configured in the Map Creation process.