Vibrant Reverie/Kut-Ku Scale

Kut-Ku Scales are crafting materials, dropped by Yian Kut-Ku. It is used to craft Kut-Ku themed weapons.

To craft all the items you would need 89 Kut-Ku Scales, which translates to slaying Yian Kut-Ku 3 to 5 times.