Arenas
Arenas are where players face each other when playing matches. Besides the players, each arena has a set of Platforms that players stand on and Banners behind the players.
The Lockerroom
While not technically an arena you can fight in, the Lockerroom is a location with similar characteristics as the other arenas. This is the location of the tutorial and where you can only go up against a training dummy to test your loadout.
The Warhouse
The starter arena where players battle each other in duels.
The Scrapper's Market
The second arena which is unlocked in the store when the ModOps campaign is completed.