At first glance the arena seems to be hills of lush vegetation surrounded by some sort of fog, however on closer inspection, it is really islands of vegetation and hills suspended over lava rivers and fire beneath, so watch your step, the fog isn't fog at all but steam from where there are streams flowing off the sides of the islands and down onto the lava below.
On the top level of the arena it is open to the air above, and has lush green vegetation and hills, lots of shadows, lots of places to hide. Some of the islands are only a few feet across, more like stepping stones, while some are quite large, the central one being the largest with a Greek style building at the top.
Within the Greek style building there are a few 6 foot tall Greek statues
Beneath the "islands" the lava an fire below are broken apart by rocky areas that are free of lava and fire
There are some stone steps leading down towards the lava/fire beneath at various points