"Right, I'd forgotten about the Realm-Breaking Insect." Lu Xiaotian suddenly recalled the two gray stones he had obtained by chance long ago. He had studied them for years, losing quite a bit of spiritual sense in the process, yet later on he had made no further progress at all. Lu Xiaotian did not take it too seriously. He had Soul-Nourishing Pills, so any strand of spiritual sense he lost could soon be restored. Now that he possessed five Primordial Spirits, he cared even less about such a loss. Though Lu Xiaotian was not afraid of investing resources and did not lack patience, there were simply too many things in the cultivation world that could not be judged by common sense. It was hardly strange for someone to spend decades, even a century, researching something, only to find in the end that it was of little use. He had spent several decades on these gray stones, so he did not find it particularly remarkable. Of course, that was only because he could divide his mind for multiple tasks. Had he not cultivated the Secret Art of Splitting the Spirit, he would not have had the leisure to squander so much effort over the years.
Still, Lu Xiaotian felt somewhat helpless at receiving no return whatsoever from all that effort. Recently, he had been busy forming his Golden Core. Now that his Golden Core was complete and his magic artifacts had entered his body for nurturing, nothing was especially urgent for the time being. Only then did he recall the Realm-Breaking Insect's extraordinary effectiveness against certain strange restrictions. Perhaps the gray stones contained some powerful restriction. Although Lu Xiaotian's attainments in formations were no longer low and he had discovered nothing unusual on the stones' surfaces, he still harbored a sliver of