Medieval MMA is not like typical medieval combat circles, which prefer to focus on the "arts" part of martial arts. Russia's M-1 Medieval fighting is all about taking fully armored bruisers, giving them swords, putting them in a brightly lit ring, and letting them beat the absolute hell out of each other. M-1 Global, Russia's biggest MMA league, stumbled upon this incredible formula when they decided to introduce a "Medieval league" in 2015. Starting off as a novelty act, armored knights would tussle to fill the time in between official MMA matches. But the crowd loved the halftime entertainment so much that the organization moved on to full "knight fight nights." Now, armored warriors fight in a real league with their own categories, title fights, and, of course, champions -- whom we imagine get a +1 to their armor bonus or something.
Strangely, people were a little underprepared for how dangerous "MMA but with weapons" turned out to be. Strict rules were drawn up to contain what immediately became the league's most violent competitions. No groin attacks, neck attacks, or arm locks are allowed. Neither is thrusting at an opponent with your sword. Actually, the safety advisors would have preferred they not use swords at all, but the league made it clear that the use of swords in their sword-based tournaments was "non-negotiable."