Hello, and welcome to Final Fantasy Answers. What question do you have today?

It's a difficult question because we are never directly told, though there are perhaps difficult hints dropped somewhere. It seems as if they were all branded by Fal'cie and, failing their foci, became cie'th. This explains why cie'th can be seen throughout Pulse but human life can't. However, this then begs the question of 'why was EVERY human branded, and doomed to become l'cie?'

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