Perfect Core (Medium)

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 (6800 Amity), Craft x 2 (7700 Amity) Chaos Arena: Chaos Arena Lv. 1, Chaos Arena Lv. 2

Target

 * Weapon: Bluestin - Shadow Titanium (Aqua) Grade
 * Armor: Bluesting - Shadow Titanium Grade
 * Astral Bike Card: Blue