The Arena is a Player vs. Player (PvP) activity, where you'll be fighting 1v1 battles against other teams of three. The winner will gain trophies, rise in rank and earn chests containing powerful loot.
Currently, there are six different ranks:
Ranks affect the drops rate of chests, so the higher the rank the b.
There are three types of Chests:
You can have a maximum of 4 chests at a time. Every type of chest has a different opening time, which you need to manually open and claim the rewards.