Great Crystal (Crystal Chronicles)

The Great Crystal is a large crystal that if often referred to in the Final Fantasy Crystal Chronicles Series. Shattered pieces of it appear throughout the series.

Final Fantasy Crystal Chronicles: Ring of Fates
In Ring of Fates, the Great Crystal is kept within crystal capital known as Rebena Te Ra, during a time that'll eventually be known as the Golden Age. The four Tribes live in this city and often go to pray in front of the Great Crystal kept within the Crystal Temple.

Final Fantasy Crystal Chronicles
In Crystal Chronicles, the Great Crystal is no longer in one piece. The Carbuncle in Mag Mell explains that during some point between the Golden Age and the current time of this game, a meteor fell from the sky shattering the Great Crystal. The Crystals blessing faded and soon the poisonous gas known as Miasma spread across the world. People soon figured out that the shattered pieces of the Great Crystal kept the Miasma at bay, so people built settlements around them. The effect only last about a year so Myrrh from Myrrh Trees was needed to renew the crystals power. This began the Crystal Caravans, where Adventurers from different town and villages would be sent to collect Myrrh from the Myrrh Trees within dungeons using the Crystal Chalice. This wasn't necessary when the Great Crystal was one, as people were able to supply the one crystal with their memories that became drops of Myrrh.

Final Fantasy Crystal Chronicles: My Life as a King
In My Life as a King, a piece of the Great Crystal appears within the center of the Kingdom. It grants King Leo the power of "Architek" to rebuild his Kingdom that was destroyed during the time when Miasma covered the world.