Neuroshima sourcebook describing in detail Gladiator character class.
From the back of the book (translated by user):
Yet another of Neuroshima supplements! This book written by Jurek Cichocki covers many interesting aspects of "arena fights" in post-apocalyptic world. Besides clearing out "fair play" rules, customs and various interesting facts, this supplement introduces many new items that can be used to hurt people and few new tricks for our characters.