The word "gladiatorial" refers to something related to or resembling a gladiator, who was an ancient Roman fighter. It can describe activities or competitions that involve combat or intense competition. Full definition
Thor loses his hammer and faces the Incredible Hulk in gladiatorial combat in the action - packed first look at Thor: Ragnarok (theguardian.com)
Developed by the same studio responsible for the Tenchu and Way of the Samurai series, Gladiator Begins combines the bloody, brain - smashing violence of Gladiatorial combat with deep customisation options — where your choices outside battle greatly affect your chances of victory in the arena. (gamingbolt.com)