Quartz Core (Archridium)

Introduction
List of crafting materials can be found in here.

Obtained from

 * Extract: Archridium orb/crystal.
 * Craft: From Request Crafting.

Used for

 * Craft: Crafting equipment using Professional Amity Crafting.
 * Craft: Crafting Magic Damage Amplifier (Lv 7) using Request Crafting.