神結晶 [shinkesshou] or 'god crystal' in Japanese.
Brave Exvius

Buy: - (sell: ? gil)
Drops In: Lechios Hills, Lanzelt Mountains (Foothills), Korobos Reef, Hall of Awakening
Drop: Chimera (Demon Woods), Golem, Shiva
Use: Awaken all characters rank 3-4
Type: Material, Number: 076
Description: A large crystal that makes potential bloom
Profile: A large version of a vision crystal that can make the potential abilities of its bearer bloom. It is fairly large for a vision crystal, and very heavy. In addition to being very scarce, it doesn't respond to ordinary people, so even should you obtain one it's rarely if ever of any use. However, it's said to give great power to those worthy of receiving its protection.
Category: Item