| “ | This core in the hands of the Shaper could be morphed into an energy source powerful enough to act as the heart of an Ancient. | ” |
— Item Description
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Crystalline Cores are a type of resource that can be obtained as a common drop from Lesser Geodian Topside Caches, you can also craft it with 50 Bomber Royal Coin at the Bomber Bench in the hub (you can only craft it once per week) . They can also be obtained by completing 5-star dungeons on the Geode Topside within the time limit; 8 Cores are given for obtaining the Gold Reward of a 5-star dungeon, and 3 Cores are given for obtaining the Silver Reward.
There is a limit of 1 Gold Reward and 2 Silver Rewards per day. All further rewards after these are Bronze which gives 1 Lesser Geodian Topside Cache.