Probability gameplay is a purely random process. Each random process is an independent calculation and does not accumulate the probability of winning. The probability value does not guarantee that you can get reward items 100% after a certain number of extractions.
Drop Rate to open Challenger Chest in the Honor Pass Event:
80% chance to obtain Normal Reward
16% chance to obtain Advanced Reward
4% chance to obtain Great Reward
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Game Guide for King of Avalon