Bring the arena back! It allows friends to fight each other with no repercussions. Its a community bonder that was free and allowed everyone to join the fight for fun!
It was also a great place to test newly equipped items, and game features.
It was because of the arena that we found the 1% physical damage bug on patched boots when attributes were introduced!!
You can even do seasons, with frag counters. (No rewards necessary) I do not feel it would be that difficult to copy paste a few towns from the map and make a every few month rotation! Could be something to look forward to while other major projects are being worked on.