This was one of the levels I worked on for RIGs (2016). On this level I was involved in initial lighting tests for many areas plus sunlight balancing. However a large chunk of the lighting work was done by Piran Tremethick and Luke Darby.
As well as lighting work I created shaders for the arena floors, arena walls, HQ building and a few other bits and pieces. I also did a good chunk of work on the skybox.
Shawn Spetch was in charge of this environment, he also tackled a lot of the texture work required for it.