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The first is the regular tail blade, which gives you 10 seconds of bonus time after killing the Boss.
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The other is White whorling, in advance, let the high-damage members and low-damage members challenge the Boss at the same time, the low-damage member will lower the Boss's blood line after the high-damage member finishes, when the high-damage member deals more than 4.3 times the Boss's remaining health, it will get 90 seconds of reward time.