Arenas are instanced PvP scenarios that are not part of open world PvP. Arenas have 1 person, 3 person, and 5 person group sizes. There may also be 20 person group sized arenas. Arenas are planned to be a Free-For-All Deathmatch style arenas system. There won’t be specific guild vs guild arenas but teams will be able to group up and face other teams.
There will be an arena ladder system. Rewards for arena ladders have not been revealed yet but some rewards may include titles and a variety of other incentives.
It has been noted that the arena system may support cross-server combat although this is still to be determined.