Testimony of White Crystal
白晶の討伐証 [hakushou no toubatsushou] or 'testimony of white crystal subjugation' in Japanese.
Pictlogica

Obtain: event quest Yuna's Sending (quest 2)
Use: required for EX Fusion of Yuna (FF10 version) from grade I to grade II
Type: Grade Up Material, Rarity: ★★★★
Description: Material for EX Fusion and EX Alchemy synthesization
Other: an obsolete item. Was replaced by Soul of a Hero in November 2014
Category: Item