Arena

Overview
The arena is a PvP game type where your team is put up against another team of similar points. Whoever's creatures are the first to fall loses.You do not control your creatures and the AI automatically selects targets and uses abilities. Before going into the fight, you can select which stat you want to boost for each creature. Each category yields a 10% increase in that stat. Ex: if you choose ATK boost on a creature with 200 ATK, it will now have 220 ATK for that fight. Feel free to play around with these to determine which setup is best for your team. You need to have at least 1 Lv 15 creature in order to participate, however i highly recommend having at the very least 3 Lv 15s if you want to get serious about rewards.

Ranking System
The rank system is based off of an arbitrary amount of points. Everyone starts each week with 1000 points. At first, you will gain 30 for a win and lose 20 for a loss, however, as you move around the ladder these values may change. The goal of this mode is easy, gain the most points possible each week to gain the most rewards. You can hold a maximum of 10 battles, and you regenerate one every 30 minutes (5 hours for full regen). If you run out of available battles and you wish to continue you can pay 1 gem per battle to keep fighting. You will be ranked by the amount of points you have. Your rank divided by the total number of players that have played at least one battle will give you your percentile rank, which is used to determine your rewards. Shown below: As you can see, the higher your rank, the better the reward. if you fall between 11-50%, you will gain a coin reward as well as 1 4* Gear Chest. If you fall in between ranks, say 1.8%, you will receive the reward of the tier above it, in this case the 0-1% reward.

The rank resets on a weekly basis, the game says it resets at 11:59PM PST every Saturday, but I have found that it usually resets sometime in the afternoon. At this time, you may click the CLAIM button in the top right (you can see it in the pic below) to claim rewards for both rank and participation at the same time. (participation rewards listed farther down the page)