There are instances when the energy flowing through Vana'diel becomes concentrated and changes into a crystalline form. Combined with an image made by the user, the energy of these crystals can be focused onto other ingredients, resulting in new products. This process is known as crystal synthesis.
Each type of crystal has different attributes:
|Fire crystal: Heat||Ice crystal: Congeal|
|Water crystal: Dissolve||Lightning crystal: Split|
|Earth crystal: Bond||Light crystal: Restore|
|Wind crystal: Carve||Dark crystal: Decay|