Perfect Core (High)

Introduction
A comprehensive list of cores can be found here. A perfect core is a guaranteed 100% success on upgrading an item from +6 or higher (only 1 plus). Can be used on Armour and Weapons of any type. Other types of perfect cores are as follows:
 * Perfect Core (Low)
 * Perfect Core (Medium)
 * Perfect Core (High)
 * Perfect Core (Highest)

Obtained
Request Crafting: Craft x 1 (7900 Amity), Craft x 2 (8500 Amity) Chaos Arena: Chaos Arena Lv. 3, Chaos Arena Lv. 3, Chaos Arena Lv. 4, Chaos Arena Lv. 5, Chaos Arena Lv. 6

Target

 * Weapon: Osmium (Lapis) - SIGMetal Grade
 * Armor: Osmium - SIGMetal Grade
 * Astral Bike Card: RW3