Zoid Core
From ZoidsEvolution.net
Zoid Cores are an anatomical feature common to all Zoids.
Overview
Biomechanical in nature, Zoid Cores are portrayed across the various continuities as the source of a Zoid's power. It is the Zoid's true form, with its body amounting to little more than a fancy mobile shell designed to house it. While a Zoid's chassis is effectively expendable and can simply be repaired, the core is vital; damage to it is fatal and will cause the Zoid to permanantly cease functioning.