This magical creature is said to systemize and store all Light-related knowledge that Metal Units can hold within them. As Crystal Gods are far rarer than Metal Gods, there has been conflict over their existence until recent years due to few witness reports. After their existence had been proven, they were initially recorded as a subspecies of Metal Gods, but they were completely different creatures despite their similar appearance. It is said that Crystal Gods organize the records held within Metal Gods, then systemize and refine the information.
Light Crystals are best used as an ingredient for fusion, providing a base of 151,524 XP. When fused with Light element units, it grants 227,286 XP, not including Great Success (x1.5) or Super Success (x2). The unit sells for 150,000 Zel.