[quote=@MelonHead]
I'm still a little unsure of what the Arena looks like. Are we fighting on circular platforms with a staircase leading up to them (with an opening) or are the staircases outside of the structure and move back in. Or, are the platforms literal rings with empty space inside them, with a thin circular corridor running around the outside with walls to either side of it?
[/quote]

Think of it like an inverted wedding cake. The top cake would be on the bottom and then the larger cake 'circles' would have the previous layers' areas cut out of them.

Only the first level is a circle. The other levels are rings that are connected it. And no, it is not open air aside from the staircase. it is solid stone of infinite depth so you can climb it to the next level in the even that the stairs are unable to be effectively used.