The Chamber of Crystals(魔石の間, Maseki no Ma?, lit. Room of Magic Stones) is a feature and location in Final Fantasy Brave Exvius. Located at the Dimensional Vortex in the Farplane (under the Enhance tab), it is designed to allow players to obtain magicite to train their espers.
It previously was a recurring event; however, the chamber was permanently added to the Vortex with the advent of 3★ espers, whose leveling requirement are much harsher than their unevolved versions. However, it is recommended to only do Expeditions in Global version (or Chocobo Expeditions in the Japanese version) to obtain the rare Supercites.