The Arena is a competitive mode where commanders challenge one another for rank rewards. Construction requires Base level 9. The building itself has one level, while competition depends on the teams you field.
Read the Arena guide for daily attempts, defense lineups, reward milestones and the differences between Vanguard, Commander, Apex and 3v3 events.
How Arena lineups work
You select heroes for attacks and arrange a defensive lineup for incoming challenges. These are separate responsibilities: choosing an attacking formation does not remove the need to prepare defenders.
The Arena's introductory rules describe fights without damage to your forces. Rewards depend on rank at the end of the league, so a defensive lineup matters as well as the challenges you initiate.
Hero power and unit levels
Heroes are only one part of the formation. The Arena can warn when your unit level is lower than your opponent's and point to the Barracks level needed for stronger units.
Hero equipment, Airship bonuses and other development contribute to hero power. Technology effects may be situational rather than fully represented by the displayed power number. The hero catalog covers individual heroes, while the Infantry, Tank and Aircraft Centers improve their respective hero types.
