For battle-hardened veterans at cap level, nothing is better than doing 5 vs 5 battle on Arena match. You can queue for Free or Team Arena. Arena is the ultimate indicator for your PvP skills. As you do battle and earn points, you will be able to exchange them to get the most powerful PvP gear.
To join Free Arena, form a team of maximum 3 players, while to join Team Arena, you need to form a team of 5 players. Once team is ready then you could enter it by either Smart Matching or talking to the Arena Manager NPC in Ignea. Be sure to have 50 Gold to register your team.
Winning a match will grant you 5 Fighter Badges after Free Arena finished. Even if you lose the match, you will still get 1 badge as consolation reward.
When you join Team Arena, your team needs to perform minimum 30 rounds each week and 50% participation to get badges. Badges will be given each week according to the respective rating of the team.