Core Driviars (コア・ドライビア Koa Doraibia) were devices developed by Krim Steinbelt, converted to act as the source of power for the Shift Cars, Tridoron, and later the Roidmudes. These allowed them to create or counter the Heavy Acceleration. He allowed his colleague Dr. Banno to use them in the creation of the Roidmudes, which in the end participated in their revolution. What Is in the Belt's Past? Apparently, after Krim heard a ruckus on Banno's lab, and finds out his colleague's project is much more lethal on using a human sacrifice for his experiment, causing their partnerships broke apart, Banno stole one of Krim's equipments.