For those who have not completed games in the Xenoblade Chronicles series, this page contains spoilers regarding the plot. Discretion is advised.
The Battle Arena is a location in Xenoblade Chronicles. It is first known as the "Arena", and is located on the second floor of Prison Island when it is revisited. It connects to the Behemoth Nest, and is renamed the "Battle Arena" when Dickson drops the Arena down a level.