A crystal is mined from a Crystal Ore. You can use them to make a crystal blade which is the strongest sword in the game. It is also a storyline-based item, where the player must collect 10 crystals scattered across island 3 and use them for a teleport. These crystals are very heavily guarded by Raptors.
Crystal stranded 2


Crystals can also be sold to Pirate to get 8 bags of gold.
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