“Because in the hands of a sadistic bastard, a combatant can raise his power exponentially. Once it is charged up enough, its owner gets massively stronger each and every kill. I don’t think there has ever been a faction wars where the victorious army is led by a champion who doesn’t have one of these rings, amongst several other items. And those rich assholes who fight it out on the ninth floor will do anything they can to win. This sort of item can’t be brought in from the outside. But the factions can collect them if they can convince an idiot to go hunting for one on the sixth floor. And
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