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Focus (Final Fantasy XIII)

From Final Fantasy Wiki

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Focus is the term for the missions given to the l'Cie by the fal'Cie. Each l'Cie is given a Focus that is a mission unknown to them, and if he or she fails to complete it, the l'Cie will turn into a monster known as a Cie Corpse. But the reward for completing a focus is not much better, either, for the l'Cie will then be immortalized as a crystal.

However in the TGS trailer, Serah is shown dying in her sister's arms, suggesting that there may be a process to reverse the crystallization, though it may be fatal.

Focus are given to the l'Cie through visions and they must interpret these visions to know what the mission requires them to accomplish.