What if we create special challenge arenas spread out throughout the map that are unlockables through quests or dungeons? Simply put, if you've ever played Riddler's Revenge on any of the Batman Arkham games you should have an idea what I'm talking about. Time trial arenas, mini bosses, survival against hoardes of waves, etc. We can create the same effect by making challenge arenas for players to take on enemies in a given area. Ex: Swamptown Arena = Slimes, Railroad Arena = Bandits, York Town = Pyrats, etc. To make things fun, we can also take the Pokemon Gym approach where you must conquer one arena in order to move onto the next. Each one gets progressively harder and you will need to rely more on skill and advanced weaponry in order to advance. The final arena would be placed in a new area on the map, impossible to even venture to until you've completed all other challenge arenas. It'll contain a mixture of all enemies throughout the game and you'll really have to have all the tools and techniques by then and apply everything you've learned from the previous arenas to conquer this one. After you've completed it, you're free to go back to any other arena you like and replay all the challenges and you're also given the option to customize the arena. You can set assets and limitations on your battles such as health, certain weapons, enemy advantages, etc. And you're also able to play with your guild and fight until the last man standing and see how long you can all hold out. It'll be fun.