Open the Miner Chest to randomly get different qualities of Gems, Hole Saw, and other items in the Gem system. Miner Chests of different qualities can be opened by different keys.[How to get a Miner Chest]1. God of Forging – Kingdom Ranking rewards.2. When you are digging Gem, you have a chance to get Miner Chest and Key to it at different qualities.
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Game Guide for Clash of Kings