Chain sparring so you face people without regening hp when you win so if you get down to 32hp thats your hp for the next match until you die. But to make up for the fact that you don't get healed you can get more wins so the first time you win you get 1 one win second time you get 2 wins third time you get 4 wins fourth time you get 6 wins etc. But because it would be easy to boost off this you should have to have 1000-2000 wins with 500-600 to enter the room.