The centrepiece of the room was a huge round sand pit on a raised platform, easily a hundred hooves in diameter. That must be the actual combat arena. There was a small lip at the edge to hold the sand in, surrounding about a ten-hoof wide rim, before the floor dropped into a trench or moat that was a good twenty hooves wide and maybe four or five hooves deep. After that, a thirty-hoof-wide outer ring encompassed the trench, rising slightly higher up than the arena floor.