There are four bonus treasure chests: wooden treasure chest, silver treasure chest, golden treasure chest, diamond treasure chest.

Four treasure chests can produce five different items: Common hero stone fragments、Rare hero stone fragments、 Strength\Defense Potion、 EXP Potion、 TURN Potion.

Different treasure chests have different probabilities for opening items:

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Different hero stones have different probabilities for synthesizing different card rarities: