What do you mean by Hearthstone's duel progress?

Everybody pk each other's progress bar. Hearthstone legend shows that the progress of duel is the progress bar of pk between people. There is an upper limit to the progress of damage caused by each battle. When the upper limit is reached, the metering tank will enter the closed state. Explorers Association series of heroic skills and signature treasures and the unlocking of Tomb Raider inherit the progress of Tomb Raider, which can be unlocked by the progress of duel game and Tomb Raider game.