Hi SE,
I have a suggestion for a recurring content, Battle Arena that should be easy to implement:
1.) Similar to Nyzule Isle, but 1000 floors, each consisting of 1 room.
2.) Each room contains a random Enemy or Group of Enemies.
3.) Each room contains a random objective, which may be things like: survive, kill all enemies, Move an Enemy to a position marker, using aggressive abilities, etc etc.
4.) A psyionic force (aura) exists in each room that gives a positive or negative effect on the player.
5.) Progress is recorded up to floor 1000 and saved every 100 floors.
I don't exactly know what the reward would be...but some restrictions come to mind:
1.) If you change jobs, you must start over from the nearest 100th floor.
2.) Random moogle floor is health/ability replenishment.
3.) Some objectives require coordination, like complying with an enemies/target's cryptic requests.
My thought process was the original FF7 Gold Saucer Battle Arena, but with a updated twist.