Empty Crystal

Empty Crystal is a stone.

Source
Empty Crystals can be obtained from company airship and company submersible exploratory voyages.

Uses
Empty Crystals are used in unlocking the following schematics in the company workshop:


 * Aetherial Wheel Prototype II
 * Aetherial Wheel Prototype III
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype III
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype III
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype III
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype IV
 * Aetherial Wheel Prototype IV