From Douluo Continent, Sharing the Heavens

After reaching the Refining Spirit into Void realm, one could break free of the limitations of the physical body, allowing the primordial spirit to leave the body and roam thousands of miles in a single thought. The highest realm, Refining Void into Dao, was the ultimate goal of all cultivators. It meant that a cultivator had become one with the Dao. Put simply, it meant becoming immortal! After sorting through the memories shared by Zombie-Dai Changsheng, everyone could not help but smile excitedly.