The Strongest Great Emperor Cultivation System

A million years ago, humanity was in decline and reduced to food for the demon clans and other races. The Ancestor of Humanity created a cultivation system, led humanity to rise up, established the Human Realm, and protected his people for hundreds of thousands of years. A million years later, after transmigrating, Su Yuanbai happens upon an Emperor-level cultivation System. From Mulong Town to the Xuanling Academy, and then beyond the borders, he fights the demon clans and other races, leading humanity step by step back to the peak.