Mothercrystal

There are five Mothercrystals that serve to maintain stability in Vana'diel. The five crystals are named Mea, Holla, Dem, Vhazl, and Al'taieu.

The Rise of the Zilart Missions concern themselves with the first four Mothercrystals. The Craigs of Mea, Dem, and Holla, as well as Fei'Yin (built above the Vhazl crystal) were built by the Zilart to harness the power of those Mothercrystals. Delkfutt's Tower was the control center for the harnessing of this power, which was used to power Tu'Lia, with the goal of opening a gate to Paradise. The Crystal Line was the conduit used to carry the power from the craigs.

The Chains of Promathia Missions introduce the fifth Mothercrystal in the later missions. It is located in Al'taieu.

The five Mothercrystals are fragments of the Great Crystal. The fragmentation of that crystal is what allows Vana'diel to exist. If the five crystals were to reform into the Great Crystal, it would create the Paradise that the Zilart fanatically saught. Small side effect of this reformation of the Great Crystal would be the end of Vana'diel, something the Zilart either didn't know, or chose to ignore.