After Lu Xuan exchanged a piece of Third-Grade Jiao Vine from a female cultivator with his Second-Class Fire Separating Sword, he continued to stroll around in the black market.
After searching around, not finding anything resembling unknown spiritual seeds, he found an empty spot and hung up the First Grade Flying Sword that he got from Qin Ming.
Finally, he successfully sold it for the price of thirty-five Spirit Stones.
He couldn't find any specially satisfactory protective arrays in the black market, and the ranks of the few cultivation techniques he saw were not so high either, so Lu Xuan had to give up.
After weighing his options, he spent thirty-two Spirit Stones to buy a First Grade Shield named Iron Scale Shield, which has densely packed black scales on its surface. It's protection level is pretty good among First Grade artifacts.