Arena
Fight a series of 6 challenging battles in a unique PVP game-mode called the Arena. Complete more battles without losing for a chance at higher Rewards and special offers.
Overview
Unlock the Arena mini-game by completing the Broken Spire Questline. Battles in the Arena are played using a drafted team system, where each Troop in the Arena is restricted to the lower Rarities. Each Arena series you participate in costs 1,000 Gold as an Entry Fee. Arena battles count as PVP battles as you verse opponent players and the teams they have selected.

After unlocking, access Arena in the Games menu along the bottom of the World Map Screen.
How to play the Arena
Choosing your troops
There will be an opportunity to select from 4 randomly drawn Troops of a specific Rarity type at a time, to form a team of the following:
One Common Troop
One Rare Troop
One Ultra-Rare Troop
One Epic Troop
Once you have selected your team they can be re-ordered. One Troop can only be selected from the 3 presented at once, and future choices are hidden until you have made a choice from the existing selection. You can see the Troops you've previously chosen on the left side of the screen so you can ensure the other Troops.

You can change your Troop order on the left side of the Arena screen, and your Weapon on the right.
Special Rules in the Arena
In the Arena, you can verse players of various Hero levels and Troop collections. To keep the Arena on an even playing field, these rules apply to all Troops and the Hero:
Set to level 15
No Traits
No benefits from Skill bonuses
Summoned and Transformed Troops are level 15
Battling in the Arena
Once you have formed your team, you will be pitted against teams drafted the same way by other players. The objective is to win as many battles as possible before receiving 2 losses. Once you hit 2 losses or 6 wins, you will receive prizes based on the number of victories made.
Players with VIP level 4 and above will start all their Arena runs with 1 Victory, so they will only need to win 5 Arena battles or receive 2 losses to finish the Arena run.

View your wins and losses on the right. Once you've reached 6 wins or 2 losses, you can collect your Arena Rewards.
Rewards
You can receive the same Rewards you would obtain from a PVP battle while earning your wins in the Arena. Overall Arena Rewards are based on the number of victories you had:

Arena Rewards include Gold, Souls, Glory Keys, and Guild Trophies.
Arena Offer
If you win at least 5 Arena battles during your run, an extra Daily Offer will appear on your screen after collecting your Arena Rewards. If you win 6 battles in your Arena run, you'll get a 10% discount on the offer.

Tips
Try to choose Troops with as many different Mana colors as possible. For example: if you choose a Brown Common, try not to choose a Brown Rare.
This will help your Troops earn Mana by being "Mana blocked" from other Troops of the same color.
Don't forget to change your Troop order to the way you want it
Choose Mana generator Troops to help you power up your damage dealers
Avoid choosing Troops that need special conditions to function well. For example: "deal triple damage if the enemy has a hunter's mark" or "boost damage based on gold collected."