風の大結晶 [kaze no ookesshou] or 'large crystallization of wind' in Japanese.
Brave Exvius

Buy: - (sell: ? gil)
Gather: Demon Woods, Lanzelut Mountains Upper, Lanzelut Ruins, Gorzas Ravine
Use: Wind Spear, Aerora, Baraerora
Type: Material, Number: 014
Description: A crystallization bearing an uncommonly strong power of wind within
Profile: A large crystallization born of condensed Wind element magickal power. Bring it close to your ear and you'll hear a sound like wind blowing violently. Since ancient times wind has been the symbol of enquiry, and is often thought of in conjunction with travels. Due to that, these crystals are sometimes given to charms for travellers, as prayers of blowing away the hardships and doubts of travels like the wind.
Category: Item