This magical creature is said to systemize and store all Water-related knowledge that Metal Units can hold within them. They always appear to be in a foul mood and no one understands what they're always ranting about. Asking them about it only stirs more trouble, and even troublesome Water Ghosts try to put on a smile to cheer them up. However, whenever they notice that their companions are not truly listening, they get even more upset and leave without a word.
Water Crystals are best used as an ingredient for fusion, providing a base of 151,524 XP. When fused with Water element units, it grants 227,286 XP, not including Great Success (x1.5) or Super Success (x2). The unit sells for 150,000 Zel.