Darth Bane, Darth Malak, Darth Revan, Darth Sidious, Darth Vader, Darth Nihilus, and Starkiller
Hal Jordan (New 52), Sinestro (New 52, Yellow Lantern), Atrocitus (New 52), and Black Hand (New 52)
The arena is a rocky area the size of two football fields. Fight to the death. Who wins?