The Arena is where teams of Heroes fight one another in asynchronous player-versus-player battles. Players set up both a Defense Team as well as an Attack Team. Both teams can share Heroes and be adjusted at any point, so do not hesitate to put your most powerful Heroes to the test!
As either one of your teams defeats opponents, you will gain Rating that will increase your ranking, and with enough victories, you can increase your Tier as well. Arenas are divided into Seasons, where players will vie for the top Ranks within a set amount of time. After the time period has ended, the Tier you are in will determine the Rewards you will receive. The greater the Tier, the greater the Rewards.
However, you do not need to wait until the end of the Season to reap the benefits of your accolades. You will also be rewarded with Arena Coins as you compete in and win individual battles, which can be used in the Arena Shop for various items.