- See also: Missions (Final Fantasy XIII).
- "And they call out to l'Cie, over and over: Complete my Focus."
- —Oerba Yun Fang
Cie'th Stones (冥碑, Meihi?, lit. "Dark Monument") are petrified Cie'th found on Gran Pulse that give missions in Final Fantasy XIII. L'Cie who do not complete their Focus in time turn into Cie'th. Eventually, Cie'th lose all of their energy and become Cie'th Stones.
- See also: Datalog/History and Myth.
L'Cie who fail their Focus become Cie'th, cursed to wander the wilds in a form of living death. Only after many years and much suffering do they extinguish the last of their strength and cease to roam. When this happens, the Cie'th's remains slowly fossilize, turning into what is known as a Cie'th Stone.
However, this transformation does not mark an end to the Cie'th's regret and sorrow at having failed. Even after having turned to stone the Cie'th cry out, imploring other l'Cie to fulfill the Focus they could not.
Each Cie'th Stone is of a certain color signifying the mission's difficulty or class. Blue Cie'th Stones offer D-rank missions, Green Cie'th Stones offer C-rank missions, Gold Cie'th Stones offer B-rank missions, and Purple Cie'th Stones offer A-rank missions. There are also two other types of Cie'th Stones: Red Cie'th Stones bar entrance to a certain area until its mission is completed, and Grey Cie'th Stones are Cie'th Waystones capable of teleporting the party to another Cie'th Waystone whose mission has been completed.
Certain Cie'th Stones only activate after certain requirements are met.
Cie'th Stones whose missions have been completed are identified by a swirling aura. Missions can also be re-taken as many times as one desires, though the unique reward for each Mission is only offered once, with subsequent completions generally providing a reward of several of a particular type of component item, often Bomb Cores or Bomb Shells. Re-taking missions is nearly essential for obtaining the Achievement/Trophy L'Cie Paragon.