okay, here is your introduction.
You enter the arena from opposite ends (Sorry Mac, if there is a particular positioning you want you'll have to set it up yourself), Claincy from one end, Kadrok and Mac from the other. Claincy you'll have to tell us how big it is (including length, width, and height).
The gates swung open, and the combatants found themselves in a huge cavern. There was an intensive obstacle course running around the perimeter of the cavern, there was a range with several wooden dummies set up, there were a couple of rings of sand that were clearly for fighting in and everywhere on the walls and from the roof were rods, beams and platforms of metal and wood for coinshots and lurchers to practice on. It was, undoubtably, an incredible underground allomantic training complex.
From across the giant cavern the opponents locked eyes. The crowd cheered, rooting for their champions and booing at the rivals. A gong sounded, and the match officially began.