Content Suggestion: Battle Arena

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.

I think every floor could look the 2 floors inside of Heaven's Tower and be 100-500 floors of different monster arrangements. It would feel like running in a very long circle....forever though.

Another suggestion came to mind:

1.) Elemental contamination in Yuhtunga and Yhoator Jungle: Enter into a Limbus-style version of these zones. Upon entering the entire zone takes upon a random elemental alignment, (i.e. Strong Fire, Weak Water, etc). The elemental alignment persists for the duration of the event or until certain conditions are met.

2.) I like the idea of more constraints built into the zone itself in the form of physical obstacles, puzzles, traps, etc.