Heaven Rock Jade was an excellent material for setting up earth-attribute formations. As for what rank of formation it could be used for, that depended on the size of the Heaven Rock Jade. This piece before them would be more than enough to set up a seventh-rank formation.
The rank of a formation had much to do with the materials used to set it up. A formation made with hundred-year Fire Sun Wood was naturally not on the same level as one made with ten-thousand-year Fire Sun Wood. Of course, a formation required many different materials, and the core materials could enhance its power.
If Heaven Rock Jade were used to set up a sixth-rank formation, its power would be far greater than that of an ordinary earth-attribute sixth-rank formation.
Han Changming's expression turned serious. If he obtained this piece of Heaven Rock Jade and used it to set up an earth-attribute formation to assist his cultivation, he could speed up his cultivation.
"Heaven Rock Jade in exchange for yin-attribute materials. Artifact-refining materials will be given priority," Mu Li said.
Han Changming took out a golden jade box and handed it to Mu Li.
Several Void Refinement cultivators took out materials for Mu Li to inspect. In the end, Mu Li exchanged with Zhang Yan.
Han Changming frowned but said nothing. Both could refine top-grade pills, but the top-grade pills Zhang Yan refined were certainly of better quality.
Half an hour later, the exchanges came to an end, and Han Changming's group departed one after another.
Han Changming and his two wives began strolling through the streets, stopping here and there to look around.
After the time it took to drink a cup of tea, the three of them arrived at a vast bluestone plaza filled with numerous small stalls.