Force Core (Low)

Introduction
A comprehensive list of cores can be found here. Force cores are mainly used for socketing options in empty slots, more info can be fond here. Other types of force cores are as follows:
 * Force Core (Low)
 * Force Core (Medium)
 * Force Core (High)
 * Force Core (Highest)

Obtained

 * Field: Bloody Ice, Desert Scream, Green Despair, Weakened Lake in Dusk, Weakened Ruina Station, Chaos Arena Lv. 1, Mutant Forest