Millions of years ago, Crypta's ancient warriors were said to be the most powerful, and their leaders are the most storied in existence, their victories and tragedies shared between generations across every region of the planet. And no champion of that era inspires more awe and admiration than Mech-Rex, whose jaws and tail were so fast, so crushing, so relentlessly thrashing yet planned to the millisecond, a pair of arms would just get in its way. To most warriors, that's impossible to imagine. If the Centralized were descending upon Crypta millions of years ago, they would be met a legendary army led by Mech-Rex, which gave the famous Mohary engineer Zolten an idea: create a robotic Mech-Rex, strength, speed, power, and all. The only thing missing? Ancient wisdom. But that's what Equus of Caspad and Mundus of Astrium are here for. Mech-Rex is here for one thing and one thing only: to destroy every Centralized it senses, starting with an electronic roar that shakes the Crypta of past and present, and ending with Crypta staying in the hands of those who have protected it then, now, and forever.