Large Crystals can be found in every town and village in the Crystal Chronicles world. They protect people from the poisonous mist known as Miasma, that plagues the entire world. The effect is only temporary, and after a year each town and village must send out Crystal Caravans to collect three drops of Myrrh. To collect the Myrrh, the Caravanners use a Crystal Chalice, which not only can hold the Myrrh but can protect the travelers from Miasma with its crystal for a short range.
Crystals in Final Fantasy Crystal Chronicles: Ring of Fates are an item for everyday life. Chelinka was born with a special crystal in her hand that she can only use when her twin brother Yuri is around.
The Great Crystal is also seen, and it holds the memories of the world. It is later revealed that use of the crystals alter the path of reality and destiny. When the crystals are used by the moontouched Lunites they turn crimson, whereas the crystals are normally blue.
Gameplay-wise, crystals found in towns and dungeons heal party members fully and also act as a save-point and checkpoint.
In Padarak, a Crystal that appears within the Kingdom grants King Leo the power of Architek that allows him to rebuild his fathers Kingdom. To build new buildings, a type of crystals known as elementites must be collected by Adventures in dungeons. These elementites were once part of the main antagonist, the Dark Lord.