Lycanus Core

Obtained from

 * Extraction: Lycanus Orb, Lycanus Crystal, Lycanus Katana, Lycanus Blade, Lycanus Daikatana, Lycanus Great Sword, Lycanus Chakram
 * Illusion Castle Underworld: Dropped by chests which are obtained from completing stone quests.

Used for

 * Buying from Eite (Weapon Dealer): Elite's Weapon Box(Greatsword), Elite's Weapon Box(Daikatana), Elite's Weapon Box(Chakram), Elite's Weapon Box(Blade), Elite's Weapon Box(Katana)
 * Buying from Yerte (Core Alchemist): Elite's Weapon Box(Crystal), Elite's Weapon Box(Orb)