It turned out that this stone giant was the "Lord Longwu," the fifth strongest from the original Gold Desert whom he has before battled. Previously, Jia Yan could triumph over him even with his energy depleted. However, after the mutation, this so-called fifth strongest was nothing but a joke standing in front of him!
Lord Longwu did not have any faction of his own. Initially, he believed he could evade the detection of the Earth Army if he hid underneath a sand dune. Yet, his luck was not promising. When Jia Yan was rushing to aid a detachment of Earth's army, he passed right over the dune where Lord Longwu was hiding. Consequently, the foolhardy stone giant revealed itself in its escape attempt. Naturally, Jia Yan seized the opportunity to capture him!
"Not only him, any of you who want to leave—serve me for five days, then you can stay or go as you please. I won't pursue accountability," he added.