Instead of coming up with potentially boring Arena ideas myself, I decided that the combatants should come up with arenas themselves. Just give me the general setting for an Arena then a few thing you would want to see or would find cool to add to said Arena.
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Tormented Coliseum: The Coliseum has been transported into a different plain, pieces of the Coliseum float zero gravity but fighters will need to watch their steps as they can fall down!