A large crystal obtained from a defeated Fontemer Aberrant. It contains a mysterious energy.
All rivers and seas originate in Fontaine, but the water loses all its unique properties once it flows outside Fontaine's borders. Therefore, some believe that the water itself is not special and that something beneath Fontaine results in its unique seawater.
It is said that a certain scholar from the now-destroyed Fontaine Institute of Natural Philosophy had once conducted comprehensive research on this subject.